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HomeMy WebLinkAbout6B - Public hearing and consideration of a recommendation to Planning Board & City Council regardingCITY OF BOULDER ,,w.. ..- PARKS AND RECREATION ADVISORY BOARD MEETING DATE: Julv 24. 2000 (Agenda Item Preparation Date:) July 13, 2000 SUBJECT: Public hearing and consideration of a recommendation to Planning Board and City Council regarding impacts of Fourmile Canyon Creek flood mitigation alternatives on Parks and Recreation properties. REQUESTED BY: Chris Dropinski, Director Ken Ramsey, Superintendent, Parks Planning and Construction Bob Harberg, Utilities Project Coordinator FISCAL IMPACT: None at this time. Flood mitigation projects will be funded through future Flood Utility Capital Improvement Program budgets. ~... ~ PURPOSE: The Parks and Recreation Advisory Board is being requested to review the flood mitigation alternatives and evaluate the acceptability of resulting impact on the parksites that may be impacted. Recommendations from the PRAB and several others will be forwarded to Planning Board and City Council to weigh in their consideration of the most appropriate alternative for the community. BACKGROUND: Please see Attachment 1 illustrating park loacations along Fourmile Canyon Creek Floodplain and Attachment 2, an updated summary memorandum dated July 11, 2000 which provides current information regarding the project. PRAB members previously received information concerning this topic in the June board packet. A draft of this summary memorandum was included in the June 28 packet, however attachments to the summary memorandum were not included. These attachments are: A. Fourmile Canyon Creek Major Drainageway Planning - Phase A Report - Alternatives Analysis Executive Summary dated June, 2000 r•-- ~ page 1 B. Wonderland Creek - Ftoodplain Analysis and Delineation Study and Potential Flood Damage Estimates Summary Memorandum dated June 28, 2000 C. Independent Review Panel Findings and Recommendations dated May 2, 2000 D. Drainage Utility Master Plan Update - Goals and Objectives dated October, 1999 ANALYSIS: As discussed in the summary memorandum, Utilities staff recommends that a larger and improved drainageway be constructed along Fourmile Canyon Creek to eliminate spill flows to Wonderland Creek and to contain the high hazard flood zone. The drainageway construction improvements that coincide most closely with the Utilities staff recommendations are those described for the 50-year alternative in the Fourmile Canyon Creek Major Drainageway Planning - Phase A Report Alternatives Analysis dated June 2000, prepared by Love & Associates and Anderson & Company. Alternatives to this recommendation include the following: 1. Maintain the status quo condition (approximate 10-year flood conveyance.) Under this alternative, construction of drainageway improvements on park property would be minimized. ^ ...~k 2. Construct smaller drainageway improvements (25-year flood conveyance.) Under this alternative, construction of dreinageway improvements would cause less impact to park property. 3. Construct larger drainageway improvements (100-year flood conveyance.) Under this alternative, construction of drainageway improvements would cause more impact to park property. 4. Provide other forms of flood mitigation consistent with the Independent Review Panel recommendations including floodproofing of individual structures within the projected floodplain and additional flood warning features. 5. Combination of the above alternatives. The proposed drainageway construction work would impact certain park properties along Fourmile as discussed in the June board packet and repeated below. This description is from the Phase A report. Properties along Fourmile Canyon Creek that would be affected by the proposed 50 - year alternative include 1) Boulder Vatley Village Park located north of Violet between ~ Broadway and 19th, 2) Elks Park and 3) Ple9sant View Fields. page 2 1. Proposed improvements that would impact Boulder Valley Village Park include the ~ following: '~-- Channel Work Channel design capacity 3,300 cfs. Allow discharges in excess of 3,300 cfs to overtop the south bank and spill to the south. See typical channel cross section Figure 8-3. Excavate south overbank to increase channel capacity. No modifications to the channel invert or north overbank. Repair failed drop structure and stabilize erosion at east end of this reach. Revegetate, landscape and mitigate wetland damage of all disturbed areas. Construct a sediment capture and wetland mitigation facility at the east end of this reach. Pedestrian Trail Construct pedestrian/maintenance trail along the south overbank. Construct pedestrian/maintenance access crossing structure. Construct a multi-use underpass at Violet Avenue. Road Crossina Structures Remove and replace the Violet Avenue bridge structure and incorporate a multi-use underpass. ROW/Prooertv Acauisition 170-foot minimum channel top width is required for the proposed channel improvements. , Miscellaneous Coordinate development of the channel improvements with the ,~ development of the Ciry of Boulder Violet Park site located on the south bank. This mitigation approach will preserve the existing creek riparian habitat and continue to allow a developed and level use of this park site. 2. Proposed improvements that would impact Elks Park include the following: Channel Work Channel design capacity 2,750 cfs with no in-channel freeboard. See typical channel cross section Figure 8-3. Excavate north overbank to increase channel capacity. No modifidations to the channel invert or south overbank. Construct 10 grade control structures to stabilize existing head cuts. Revegetate, landscape and mitigate wetland damage of all disturbed areas. Pedestrian Trail Construct pedestrian/maintenance trail along north overbank between 26"' Street and 28"' Street. Remove two pedestrian crossings and replace with one pedestrian crossing. " ROW/Prooertv Acauisition or Easements 115-foot minimum channel top width is required for the proposed channel improvements. With the exception of an existing 25-foot easement, the portion of this reach located west of the Farmers Ditch is located on private property. The portion of this reach located !" east of the Farmers Ditch is located o~ City of Boulder property. Channel `.. page 3 improvements west of farmers Ditch will require acquisition of 90 feet of right- of-way or drainage easement. ,,,,,~ Misceilaneous Modify the Farmers Ditch crossing to match proposed channel geometry. Coordinate development of the channel improvements with the development of the City of Boulder Eiks Park site located on the north bank. 3. Proposed improvements that would impact the Pleasant View Fields include the following: Channel Work Maintain existing channel configuration. Construct 1 grade control structures to stabilize existing head cut. Stabilization of bank erosion. Select removal of woody debris. Remove and replace 47"' Street culvert. Miscellaneou~ Monitor sediment deposition and flood conveyance capacity. Remove sediment and reestablish low flow channel when the channel capacity is less than the 100-year discharge. 4. While the Foothills Community Park does not lie within the 100 year fioodplain nor is directly impacted by any of the proposed alternatives, the final choice of alternatives may have a financial impact on Parks and Recreation because of the additional access that the Housing Authority and Parks and Recreation are responsible for providing. That access will likely cross the creek and require a bridge or box culvert that will accommodate the chosen alternative. ~ PARKS AND RECREATION STAFF COMMENTS: Parks and Recreation staff supports the recommendation of the Utilities staff to provide improvements for approximately the 50 year storm. Because the Status Quo alternative does not seem a reasonable solution, staff feels the difference between 50 and 100 year alternatives for the Boulder Valley Village Site and Elks Park is fairly minimal. Utilities staff has indicated a willingness to return to the PRAB for detailed design approval, as part of the actual implementation process. That intent would be to honor the commitment of necessary improvema~ts, but allow tha Board to provide input and approval on how that happens to minimize impacts to potential park uses and/or the environmental corridors. While the alternatives have varying impacts on the Wonderland Creek flood potential, there is no park land affected by that flood plain except for the new Valmont City Park. The approved channel through Valmont City Park is not impacted by the leuel of flood variability due to which Fourmile Canyon Creek alternative is chosen. Parks and Recreation staff is very interested in supporting whatever alternative is decided to be in the best interests of the community. However, we suggest the following clarification and considerations: "'R ~ page 4 The costs that are associated with providing the flood improvements on the f"` park sites (especially the excavation/grading) should not be borne by the Parks ~~" and Recreation Department. There is a benefit provided by the 3 park sites to the flood containment, groundwater recharge, etc., such that the fair market value of any new flood mitigat on=or dreinage easements on Parks DepaRment property be recognized and ap'~5~etf to future storm drainage Development Excise Tax that would otherwise be required for any park and recreation development within these flood basins. STAFF RECOMMENDATION: Approve the proposed drainageway construction improvemenis on Park and Recreation Department properties as described in the Fourmile Canyon Creek Major Drainageway Planning - Phase A Report. Construction work on specific park property shall be subject to subsequent Parks and Recreation Advisory Board approval at the time of final design and evaluation through the City's Community and Environmental Assessment Process. BOARD ACTI~N REQUESTED: Public hearing and recommendation to Planning Board and City Council approving the staff recommendation to accommodate the 50 - year alternative as it relates to improvements that would be required on park properties, subject to the clarification and consideration listed above under PARKS AND RECREATION STAFF COMMENTS. Attachment: 1. Parksites along Fourmile Canyon Creek 2. Fourmile Canyon Creek and Related North Boulder Flood Hazards - Findings and Recommendations dated July 11, 2000 ~ ~ page 5 ~ i ~ i ---- ; Attachment 1 ~.~ ~ ~ ~ ~ ~ a ~~ ~ I " O ~ ~ ~~ ~I~\-~~ . ~ ~ ~ ~ ~' Q ~~. I ~ ~ ~~ , ~; -, r--- ~~~ll, ~ Q o Ji o ~ ~ ~ i ~ ~~ ~ra ~~ 0 ~ \ a q~ qo _I -~ - ~. ~ ; ` ~- ,~ ~ a -~~- ~ ~ ioo o i ~ oe o ,= o ~ ~ o~Ql I 1 ~ i I' i ~~ i, -Ttle 0'~ ~~,p 0 ~ I a^ e a ~ O ~~G'~LT I ~ ~ i I Wo ~ o a~R ~ ~ ~` ~ e. ~~~ ~ !~~ ~~ , _ ~ ~~A~ fr7'4F1' ~v11P I~~""'*11Y~ - '~-(-I"~H1'~f - 1-r~ ~--r•-----~ - Park Sites Alorg Fourmile Canyon Creek ~ Major Drainageway Planning 100-Year Floodplain PART 1 ^F Z 0 a ~ a ~ a SP ~ 4 p n _ nll ~ ~ ~ ~~~ ~,•. a-~~ ~ 1:8400 ~ 400 0 400 800 Feet aaac ~ti]Y1e s~~~~~~~cM.a~~,~~s..~~ _,` Pm~ecunn. Gmnert Cnn(mmy Croic ~ n~~~m: vnnu 7 ,q' ~~ irv~~~ ,c: 1~IQ, , ~,.: ,9..,a ;:~,_~.~;.~..~ .~ n ~v.,... ~u.,,.~ (7 ../. ~~~.. .,.n A, ~ 4 w.:'.~°., ..,~.~;:~; IV p~C >~ ~ ~~~ ~ ~~~f ,~ .~ ~~~ ~ .~rye.~_4~ ~ ~w~~ ~~ ~-~ e.~~-~~~~...~. ~~;e ` ~• _~~~ ~~':.°" '~v ~~^~~4np ~LGntl info~meeian Servicee ~ ' 303.aa~ .32 ~ ~ ATTACFIMENT 2 ~ ,,, FOURMILE CANYON CREEK AND RELATED NORTH BOULDER FLOOD Fra~aRnS FINDINGS AND RECOMMENDATIONS SUMMARY MEMORANDUM Prepared by City of Boulder Utilities Division Staff (Draft - 7/11/00) This memo summarizes the findings and recommendations conceming North Boulder flood hazards. Information is summarized from the following reports: 1. Fourmile Canyon Creek Major Drainageway Planning - Phase A Report Altematives Analysis dated June 2000, prepazed by Love & Associates and Anderson & Company. This report was prepazed for the city of Boulder and the Urban Drainage and Flood Control District (iJDFCD). 2. Summary Memorandum on the Wonderland Creek Floodplain Analysis and Delineation Study and Potential Flood Damage Estunates dated June 2000. This report was prepazed by Boyle Engineering Corporation and City of Boulder - Utilities Division Staff ~... 3. Findings and Recommendations of the Independent Review Panel Report dated May 2, 2000 Copies of these reports aze located in the Municipal Government Reference Center of the Main Boulder Public Library, 1000 Canyon Street. I. UTII.TTIES STAFF RECOMMENDATION Utilities Division staff provides the following recommendations concerning Fourmile Canyon Creek and related North Boulder flood hazazds. These recommendations aze based on the perspectives presented later in this memo and considering resource limitations and the extent of other flood hazards in Boulder. Also, implementing these recommendations will require many (10-20) yeazs of work, depending on the availability of funding, other work priorities and the cooperation of the various govemmental agencies involved. 1. Eliminate spill flows to Wonderland Creek by providing a lazger Fourmile Canyon Creek drainageway and conveyance zone such that the 100-yeaz floodplain along Fourmile is no lazger than what currently e~cists. It is estimated that the drainageway construction improvements that coincide most closely with the above recommendations aze those described for the 50-year ~„", ~ ~ alternative in the Fourmile Canyon Creek Major Drainageway Planning - Phase A Report. Before spill flows aze contained, downstream drainageway improvements would need to be secured. ..n 2. Contain the high hazard flood zone along Fourmile within a larger drainageway or conveyance zone where structures do not exist. This will require the purchase and removal of several structures located in close pro~cimity to the drainageway. 3. Contain the 100-year flood along Fourmile within a lazger drainageway and conveyance zone provided the incremental cost and associated environmentaVsocial impact are acceptable based on a more detailed analysis at the time of capital project planning and design. 4. Revise the e~cisting regulatory floodplain mapping consistent with the grojected floodplain configuration and other information as it becomes available. 5. Continue to implement the city's cunent floodplain management regulations including regulation of the high hazard and conveyance zone and regulation of the 100-yeu floodplain with floodproofing and elevation certificate requirements; drainage and flood control utility progams including high hazard and post flood property acquisition, flood insurance (Community Rating System) and public education; and emergency preparedness and response including flood forecasting, eazly warning and disaster coordination and assistance. 6. Consider a city-wide incentive program for flood proofing individual properties as part of the update to the city's drainage utiGty master plan. ~ 7. Consider the potential ramificatioes (what-if scenarios) of lazger floods such as the 500-year -- flood event as part of the emergency prepazedness and response program. 8. Implementation of the recommended flood mitigation may increase flows in the Fourmile Canyon Creek floodplain between the downstream limits of this study (approximately Highway 119) and its confluence with Boulder Creek. Additional studies are recommended to insure properties located downstream of the study limits aze not adversely impacted by implementation of upstream flood mitigation measures. Additional flood mitigation efforts in this downstream reach can be expected. II. BACKGROUND North Boulder flood hazards have been considered in several studies and reports. The most recent aze the Phase A(altematives analysis) and Phase B(preliminary design) Major Drainageway Planning reports prepazed by Greenhorne & O'Maza, Inc. in 1984 and 1987 respectively. The completion of the plans, each suggesting needed projects, and EPA rules emphasizing water quality, led the Storm Water and Flood Management Utility to prepaze the Comprehensive Drainage Utility Master Plan (CDUMP), which was adopted by the City Council in 1984. Both Fourmile Canyon Creek and Wondedand Creek were considered as part of CDUI~IP. .~. In the 1980s, the land adjacent to Fourmile Canyon Creek was predominately characterized by ~^ rural subdivisions and commercial development along North Broadway. Minor drainage ~.. improvements aze identified in the current master plan, with little emphasis on containment of the high hazard zone or 100-yeaz floodplain. Since 1989, significant land azea along Fourmile Canyon Creek has been annexed by the city and developmenbredevelopment is beginning to occur. In light of these factors, the city commissioned a re-analysis of the Fourmile Canyon Creek floodplain mapping in 1997. This re-analysis of the floodplain mapping was considered appropriate given the significant increase in development in the azeas following annexation and to the discovery of errors, inaccuracies and omissions in previously adopted floodplain studies. The re-analysis indicated significant discrepancies between the original analysis, resulting in an expanded floodplain affecting many properties. In June 1999 staffpresented an agenda item to City Council requesting authorization to pursue a course of action to plan public improvements and pursue property and right-of-way acquisition in North Boulder along the Fourmile Canyon Creek conidor. As a result, City Council passed a motion acknowledging staff concems regarding the Fourmile Canyon Creek comdor and authorized staff to continue analysis of possible mitigation options combined with a relevant and timely public process. In addition, floodplain impacu to the Wonderland Creek drainageway needed to be analyzed concunently because of flood water spillage from Fourmile Canyon Creek. This has been assessed as part of a Wonderland Creek floodplain analysis and delineation study. The master plan update provides an opportunity to integrate several converging planning activities •~ in the North Boulder Subcommunity including 1) revised Fourmile Canyon Creek floodplain ~...,, mapping; 2) impacts ofFourmile Canyon Creek flooding on Wonderland Creek; 3) Greenways master plan update; 4) implementation of the North Boulder Subcommunity infrastructure; and 5) development of the North Boulder Community Park, Foothills Community housing project and a north branch of the Boulder Public Library. The master planning will be accomplished in two phases. In the first phase (Phase A) the hydrology and hydraulics of the Fourmile Canyon Creek basin and drainageway have been reviewed and confirmed. Flood damage potential has been assessed. Also, various flood mitigation options have been developed and presented for review and discussion. These options have been formulated in cooperation with the greenways program and in consideration of multiple objectives including habitat protection, water quality enhancement, storm drainage and floodplain management, trails, recreation, cultural resources, as well as the overall objectives of the North Boulder subcommunity including the North Boulder Community Park, Foothills Community housing project and a north branch of the Boulder Public Library. The second phase (Phase B) will develop preliminary designs for the selected alternatives and present these in a series of drawings and information suitable for budgeting and project development purposes. Concurrent with the Fournule Canyon Creek master plan update will be the floodplain analysis associated with Wonderland Creek. ~ ~ In response to public comments and requests, an independent review panel was formed to review the analysis and recommendations of the North Boulder flood hazazd work. ,~ III. PUBLIC PROCESS TO DATE City staff has been working cooperatively with both the consultant and community interests to outGne a public process plan for the integrated studies. The plan includes a series of regulazly scheduled public meetings, fact sheets, press releases and media coverage at key report and decision points. We have used the regular public meetings designed as "open houses" to host both educational discussion and progress reports. Also, a web site has been created that presents information concerning the project and can be accessed at www.ci.boulder.co.us/publicworks/ depts/utilities/projects/fourntile. Last fall, the city hosted three public meetings to discuss the master plan and preliminary analysis results. The meetings were well attended, and citizen input has been documented and considered in the draft master plan report. Also, input from city staff including representatives of utilities, transportation, planning, parks and recreation, open space, housing and library has been considered. The first Public Meeting was held on August 2, 1999, and was attended by appco~cimately 50 persons. Presentations were given on city of Boulder floodplain regulations; current floodplain re-study impacts, and the processes of the overall master plan study. Many issues were raised, questions asked and a plan was provided for how the study process would proceed. ~ The second Public Meeting was held on September 13, 1999. Approximately 50 persons were in ...~ attendance. The following topics were discussed: hydrology and hydraulics; history of flooding of Fourmile Canyon Creek; alluvial fan floodplain; wildlife habitat and the North Boulder Subcommunity Plans. A copy of the history of flooding information provided by a Boulder resident is included in Appendix D. The third Public Meeting was held on October 18, 1999, with approximately 40 persons in attendance. The updated floodplain study mapping was presented along with a description of the damage assessment. Various potential alternates for mitigation were discussed on a reach by teach basis and input was solicited. The fourth Public Meeting was held on April 10, 2000, and appro~cimately 100 people attended. Information from the draft Phase A report was presented along with preliminary results of the floodplain analysis and delineation study for Wonderland Creek. During the sammer of 2000 the following public hearings are scheduled with various citizen advisory boazds as follows: Transportation Advisory Boazd - July 10 Water Resources Advisory Board - July 17 4 .,~*, Parks and Recreations Advisory Boazd - July 24 ~ Open Space Advisory Boazd - July 26 ~ Also a public hearing before the Planning Board is tentatively scheduled for September 28, 2000. Transportation Advisory Board Meeting - July 10, 2000 The Transportation Advisory Boazd (TAB) hosted a pubGc hearing regazding transportation issues related to the flood mitigation recommendations on July 10, 2000. The TAB supported the transportation components presented in the Phase A report with the exception of the 9th St. connnection between Cherry St. and Yellow Pine Ave., and the extension of Yarmouth west of lOth St. However, these particular transportation components aze not needed to implement the recommended flood mitigation improvements. IV. SUIVIMARY OF THE FOURMILE CANYON CREEK MAJOR DRAINAGEWAY PLANNING - PHASE A REPORT ALTERNATIVES ANALYSIS A copy of the Phase A Report Executive Summary is presented as Attachment A. The Phase A report describes the following three alternates: A-ternate 1- 50-year Channel This alternate conveys the 50-year dischazge within a proposed improved drainageway, where needed. Also, this alternate provides conveyance of the 100-year dischazge for proposed ' conditions at or below the 100-year flood elevation for e~cisting conditions (where much of the """~"' flood dischazge is spilled to Wonderland Creek. Alternate 1 will eliminate spills to Wonderland Creek during the 2-, 5-, 10, and 50-year flood events. However, Alternate 1 will not eliminate spills to Wonderland Creek in flood events greater than a 50-year. With the Altemative 1 channel improvements asproposed, the spills to Wonderland Creek in the 100- and 500-yeaz events are estimated at 300 cfs and 3,300 cfs, respectively. If selected, a more detailed hydraulic analysis of the proposed 50-yeaz improvements would be required to deterntine the location of the spills for the 100 and 500-year flood events. Alternate 1 improvements aze shown in Figures 8-la, 8-lb and 8-lc. Typical drainageway cross sections for Alternate 1 aze shown on Figure 8-3. The total present woRh cost of Alternate 1 is presented in Table A on page 5. Altemate 2 - 100-year Channel Alternate 2 provides full conveyance of the 100-year flood dischazge within a proposed improved drainageway, where needed. Alternate 2 will also eliminate spills to Wonderland Creek up to a 100-yeaz storm event. Alternate 2 improvements aze shown in Figures 8-2a, 8-2b and 8-2c. Typical channel cross sections for Alternate 2 aze shown on Figure 8-3. The total present worth cost of Alternate 1 is presented in Table A. r ~ Alternate 3- Maintain Eaisting Floodplain Configuration (Status-Quo) This alternate would adopt the new floodplain mapping without proposing structural mitigation improvements. Nonstructural methods including flash flood forecasting and waming systems, and evacuation plans would continue to be implemented and updated. Flood insurance and floodproofing of structures would also continue to be implemented (at the private property owner's expense) in accordance with the city's current program. Acquisition of high hazazd properties and post flood acquisition would continue in accordance with the city's current program. Floodplain regulations would continue to be strictly enforced and post flood relief would be provided through the Federal Emergency Management Agency. The draft projected floodplain is shown in Figures 4-la, 4-lb and 4-lc. This alternate requires no new funding, but may sacrifice opportunities to greatly improve Fourmile Canyon Creek and mitigate flooding in the future. A"Status Quo" solution would offer no opportunity to mitigate spills and flooding to the south of Fourmile Canyon Creek and would offer no opportunity to eliminate flooding to the Waldorf or Crestview Elementary Schools. The total present worth cost of Alternate 3 is presented in Table A. Table A Total Present Worth Cost and BenefidCost of Alternative Flood Mitigation Scenarios Alternatives Construction Operation & I Flood Benefit/ I I ($) Maintenance I I Damages Cost ($) ~ ($) Ratio Alternate 1 I 11,350,000 I 2,474,000 I 3,266,000 I 1.64 (50-yeaz) Altemate Z ~ 16,800,000 ~ 2,349,000 ~ 1,021,000 ~ 130 (100-yeaz) Alternate 3 ~ 0 ~ 3,297,000 ~ 25,986,000 ~ 0.00 (no-action) * Present Worth (PW) factor determined for 50 years at 6%. Love & Associates Recommendations Love & Associates provides the following recommendations in the Phase A report: "It is the recommendation of this consultant that Altemate 2, "100-Yeaz Channel Improvements" be implemented for this project. ~ ~ ~, The 100-year flood is currently the event that is most commonly regulated within the nation. If a ,"` lesser frequency flood event were selected to construct channel improvements, a residual "spill" `r floodplain would still exist and additional flood flows would be conveyed to the Wonderland Creek floodplain. We cannot endorse Alternate 3- Maintain Existing Floodplain Configuration. This is based upon intangible life safety issues and the number of homes in the Foumvle Canyon Creek floodplain and the additional properties added to the Wonderland Creek floodplain due to the spills. Below is a list of additional items which should be considered during the review process and selection of a recommended flood improvement alternative for the Fourmile Canyon Creek floodplain. Interrelationshin ofFourmile Canvon Creek and Wonderland Creek Floodnlains It is important to realize that the Fournule Canyon Creek and Wonderland Creek floodplains are hydraulically connected. Due to topography and the limited channel capacity of Fourmile Canyon Creek, spills from Fourmile Canyon Creek flow into the Wonderland Creek floodplain. Decisions made on floodplain management and mitigation within the Fournvle Canyon Creek floodplain have a direct impact on the Wonderland Creek floodplain. This study does not quantify, nor does the benefiUcost ratio reflect flood damages within the Wonderland Creek floodplain resulting from the spill flows from Fourmile Canyon Creek. ~ Concurrent with the Fourmile Canyon Creek study, the City of Boulder is also studying the '"' Wonderland Creek Floodplain. These issues aze addressed in a separate pubGcation, which is currently being completed by the City. Due to the interrelationship of the two floodplains, this study recommends that both the Fourmile Canyon Creek and Wonderland Creek studies be evaluated concurrently to ensure a unified approach to addressing floodplain issues in north Boulder. Floodnlain Imnacts Downstream of the Studv Reach Implementation of flood improvements within the Fourmile Canyon Creek, as recommended in this report, will increase flows in the Fourmile Canyon Creek floodplain between the downsueam limits of this study (approximately Highway 119) and its confluence with Boulder Creek. Additional studies are recommended to insure properties located downstream of the study limits aze not adversely impacted by implementation of upstream flood mitigation measures. Additional flood mitigation efforts in this downstream reach can be expected. Adootion of the ReQUlatorv Floodnlain Regazdless of the flood mitigation alternative selected, this study recommends the City of Boulder and Boulder County adopt the cunent floodplain mapping as the regulatory floodplain. The ~ ~ ~... regulatory Wonderland Creek floodplain should also be updated to reflect the spill flows from Fourmile Canyon Creek. ,,,,,, All development within the existing floodplain should be completed in accordance with the City, County and Federal permitting requirements. Less Structural Imnrovements_ More Floodnlain Mana¢ement The independent review committee suggested a fourth alternative be considered which wou(d consist of less structural improvements and greater emphasis on floodplain management approaches, such as improved maintenance, early waming systems, emergency response plans, flood proofing and expanded flood insurance for those properties within the floodplain. Alluvial Fan Fournule Canyon Creek, in the azea east of the mouth of the canyoq is perched atop an alluvial fan. During the public review process, concern was expressed that due to the nature of an alluvial fan, a major flood event could radically change the course and flow direction of the Fourmile Canyon Creek channel. Concern was also expressed that the `fixed bed" methodology used to define the existing floodplain was inappropriate. The Independent Review Committee imestigated this concern and stated, in their review comments dated May 2, 2000, that in their opinion most oFthe alluvial fan is currently inactive, Fourmile Canyon Creek has a defined channel, a mappable floodplain and the "fixed bed" ,~ methodology utilized to define the existing floodplain is appropriate. If a catastrophic flood .,r>' should occur that results in a change in the course of Fourmile Canyon Creek, the City will have to respond according to the specifics of the flood event. The IRP repoR and recommendations can be found in Appendix E of this report." V. WONDERLAND CREEK FLOODPLAIN ANALYSIS AND DELINEATION AND POTENTIAL FLOOD DAMAGE ESTIMATES The Wonderland Creek Floodplain Analysis and Delineation Study and Potential Flood Damage Estimates Summary Memo is presented as Attachment B. The spill flow from Fourmile Canyon Creek into Wonderland Creek is a significant issue and should be considered in the decision making process. Between Foothills Pazkway and Broadway, the spill flow will inundate approximately 40 additional structures (mostly residential) during the 100-year flood through this area. Also, water will spill from Wonderland Creek into the Goose Creek drainageway further complicating the floodplain situation in Boulder. Preliminary estimates indicate several million dollars of potential damages aze due to the spill flow. It is also likely that several structures along Wonderland Creek may be encompassed by the high hazazd flood zone due to the spill flow. VI. ISSUES RELATED TO FOURMII.E CANYON CREEK EAST OF THE 8 ~^w DIAGONAL HIGHWAY ,~.+. ~+ As recommended by Love & Associates, issues related to Fourmile Canyon Creek east of the Diagonal Highway (downstream of the study reach) should also be considered. The Fourmile Canyon Creek Major Drainageway Planning Phase A Report Alternatives Analysis did not address the section of Fourmile Canyon Creek located downstream (east) of the Diagonal Highway (SH 119). Based on a 100-year flow of approximately 3400 CFS, there aze seven homes located in Boulder County which aze located in the Fourmile Canyon Creek 100-yeaz floodplain. Six of the seven homes located in the floodplain are located in close proximity with five of the homes located on Woodbourne Hollow Road. Woodbourne Hollow Road is a small residential street located on the east side of 57th Street approximately one half mile northeast of the Boulder Municipal Airport. The sixth home is located just west of 57th Street. The seventh house is located about 3/4 of a mile upstream of 57th Street along Fourmile Canyon Creek on the east side of the Diagonal Highway. Woodbourne Hollow Road is approximately 1/3 mile long and is wooded on the streeYs south side and open on the north side. The 100-year floodplain in the vicinity of these homes varies in width between 300 feet and 900 feet. The topography along Woodbourne Hollow Road is relatively flat as Fourmile Canyon Creek meanders along the road's south side through the residents yards. The homes aze large, typically located on several acres, and range in price between $400,000 and $800,000. Flood mitigation for the six homes in the vicinity of Woodboume Hollow Road would likely "-' involve enlazgement of the drainageway for 2,000-3,000 feet. The existing drainageway is in close pro~umity to several homes and drainageway easements would need to secured. This work would likely cost $1-2 million. The City will need to study this azea in greater detail to develop an additional floodplain delineation based on a flow which does not include the Fournvle,Canyon Creek spill to Wonderland Creek. A more comprehensive evaluation will provide an increased level of understanding as to the downstream affect of containing the Fourmile Canyon Creek spill to Wonderland Creek. VII. INDEPENDENT REV~W PANEL An independent review panel was formed to review the analysis and recommendations of the floodplain analysis and master planning efforts. Members of the panel include Gilbert White and Mary Fran Myers of the CU Natural Hazards Center, Ken Wr,ght of Wright Water Engineers, Brian Hyde of the Colorado Water Conservation Boazd, Rich Madole, a retired Unifed States Geologic Survey geologist, Bill Bradley retired geology professor emeritus at the University of Colorado, and John Rold former Director of the State Geologic Survey. The panel met on several occasions and also viewed Fourmile Canyon Creek and the associated floodplain in the field. '"w` 9 ti They also reviewed the draft Phase A report and issued their finding and recommendations in a letter report dated May 2, 2000. ~ Independent Review Panel Recommendations The Independent Review Panel (IItP) issued their findings and recommendations in a letter report dated May 2, 2000, and is presented as Attachment C. In addition to their comments on the draft Phase A report, the IItP provided the following recommendations concerning flood mitigation alternatives: 1. Channel - The channel configuration would be designed to a size that would be cost effective after the potential reduction in damages from the other floodplain management tools and techniques could be analyzed. Utilities Staff Comment: In addition to cost effectiveness, selection of the channel configuration and size should also consider the ramiftcations of the spill flaw to Wonderland Creek, life safety, development goals, water quality, wetlands, environmental, iransportation, recreatron, aesfheiics and flood insurance. 2. Flood Proofing - Flood proofing measures effective for a wide range of floods would include a variety of building and development strategies such as: o partial flood walls to redirect fast-flowing shallow water o dry flood proofing of existing structures ~/~- o wet flood proofing of e~sisting structures ""~ o purchase of residences/other structures and relocation out of the floodplain Utilities Staff Comment: The implementation of floodproofing measures on over 250 existing private properties is problematic based on individual property owner acceptance; construction and maintenance terms and conditions; easements and right-of-entry. Current city regulations require jloodproofrng arrd elevation cerh'f:cates for properties that are newly developing or re- developing. The city could consider some type of incentive program for floodproofing throughout the city as part of the update to the drainage utrlity master plan. The examination of individual structures would be needed in order to determine the effectiveness of such a program. 3. Flood Forecasting and Early Waming - An eazly waming system triggered by storm forecasts in addition to high water alerts from the upstream basin. Utilities Staff Comment: An early warning system triggered by storm forecasts cmd rain gauges located in the upper Fourmile Canyon Creek drainage basin currently exists. Rapid rise stream gauges (high water alerts) are deployed along the Boulder Creek drainageway to supplement storm forecast and rain gauge information. Similar devices could be installed along the Fourmile Canyon Creek drainage basin. Because the distance a[ong the Fourmile Canyon 10 `"°` Creek drainageway is relatively short in comparison to Boulder Creek, similar raprd rise stream """ gauges would provide less timely notice. ~.. 4. Flood Insurance - Purchase of floodplain insurance would be encouraged. Utilities Staff Comment: Purchase of floodplain insurance is encouraged by the city through advisement in annual utility bill inserts. 5. First Floor Building Elevations - No new construction would be allowed that is not in compliance with the City ofBoulder's current floodplain management regulations. Utilities Staff Comment: This is an essential aspect of the City's current~loodplain management regulations. 6. Public Education - Interested land owners would be made aware of the range of promising floodplain management actions including potential cost sharing for flood proofing of existing structures. Utilities Staff Comment: Utilities staff agrees that land awners should be made aware of the range of promising f loodplain management actions including potential cost sharing for flood proof:ng of existing structures if this is a component of the selected flood mitigation. 7. Tributary Drainage Basin Management - Soil stewazdship, wildfire control and management '" plans, and erosion control best management practices should be instituted in the upstream ``"'" Foothills basin by the county commissioners. Utilrties Staff Comment: Boulder County currently requires besf management practices for soil erosion wildfire mitigation in the upstream Foothills basin thraugh lcmd use regulations and the site plan review process. Boulder County also provides tar breaks to property awners who establish forest management plans encompassing wildfire mitigation and control of soil erosion. 8. Floodplain Management Strategies and Tools - Other strategies and tools to be considered are listed. Utrlities Staff Comment: Utilities staff agrees that fhese sirategies and tools should be corrsidered as part of any flood mitigatron plan. VIII. BOULDER COUNTY PUBLIC WORKS STAFF RECOMMENDATION 11 Boulder County Public Works Director Lazry Mattel is planning to develop a Boulder County Public Works staffrecommendation but this is unavailable at this time. n, IX. URBAN DRAINAGE AND FLOOD CONTROL DISTRICT STAFF RECOMMENDATION Ben Urbonas with the Urban Drainage and Flood Control District provides the following recommendations. "We recommend the Snal plan show improvements to the Fourmile Creek's flow capacity sufficient to return the "flow splits" to Wonderland Creek to a degree that is shown by the "official" FEMA floodplain maps. I estimate such improvements will need to provide approximately a 25-year conveyance capacity. In addition, we support other recommendations in the Phase A report made by Love and Associates, Inc. The recommendation above is based primarily on three considerations: 1. The city ofBoulder and Boulder County neighborhoods that have been developing and want to continue to develop and redevelop in accordance with the cunendy adopted floodplain regulatory maps will be made whole. In other words, no additional impact on the community's ability to develop or redevelop will result from revising the FEMA floodplain maps if this option is pursued. 2. These improvements will provide sufficient capacity to convey the added flows within ~ the Fourmile Canyon Creek corridor without increasing potential of Aooding properties ...~ along the creek that could result from decreased flow splits to Wonderland Creek. 3. These improvements will provide an opportunity to "re-establish" some of the flood carrying capacity lost in the 20 yeazs due to little or no maintenance along Fourmile Canyon Creek. Once improved, the channel can be maintained in the future. We, as staff, can only suggest what we think is reasonable and try to increase the safety levels for our citizens. Trying to address all possible concems and opinions of what may or may not happen is beyond the scope of this planning study or for that matter, any investigation that could be undertaken, budget not withstanding. Thus, implementing moderate flood channel improvements, along with ongoing maintenance, an active flash flood warning program and citizen education/awazeness raising program should provide a balanced approach to the problems along Fournvle Canyon Creek. X. UTII.ITIES STAFF PERSPECTIVE 12 ~^'*, Utilities staff considered the recommendations of the consultant, the IRP, other city department r- stai~' and the public in formulating its recommendations. The following perspectives aze provided '~ as a context for these recommendations. Perspective Specific to Fourmile Canyon Creek 1. The potential for flash flooding along Fourmile Canyon Creek is sigrificant and poses an on- going threat of damage to private and public property as well as loss of life. Over 250 individual private stcuctures as well as several road crossings and associated culverts or bridges will be inundated and potentially damaged by the 100-year flood event. The present worth value of future property damage has been estimated to be almost $26 million. 2. Appro~cimately 40-50 structures (mostly residential) are within the high hazazd flood zone along Fournule Canyon Creek. Of these structures, approximately 10-20 structures ue judged to be at extremely high risk during the 100-year flood event (mostly mobile homes in the Ponderosa Mobile Home Pazk.) This compazes with 30-35 structures (combination of residential and commercial) along Boulder Creek of which 3-6 structures are judged to be at e~ctremely high risk during the 100-yeaz flood event. 3. There aze numerous existing residential structures with basements in the spill area between Fournvle and Wonderland Creeks. Occupants of basement areas would be exposed to a life safety threat during a flood because the basements may fill completely with water. Floodproofing of basements is not recognized by the Federal Emergency Management Agency as sufficient to allow r"" the construction of basements within the 100-yeaz floodplain. ~~.... 4. The spill flow from Fournille Canyon Creek into Wonderland Creek is a significant issue and should be considered in the decision making process. Between Foothills Pazkway and Broadway, the spill flow will inundate approximately 40 additional structures (mosdy residential) during the 100-yeaz flood through this area. Also, water will spill from Wonderland Creek into the Goose Creek drainageway fuRher complicating the floodplain situation in Boulder. Preliminary estimates indicate several million dollars of potential damages are due to the spill flow. It is also likely that several structures (10-15) along Wonderland Creek may be encompassed by the high hazazd flood zone due to the spill flow. 5. Development goals described in the North Boulder Subcommunity Plan would be siguficantly impacted by the projected floodplain configuration, primarily in the commercial azea along North Broadway. Several properties aze within the projected 100-year floodplain as well as conveyance and high hazard zones. Unless drainageway improvements aze secured, redevelopment of these properties will be difficult if not impossible under the city's cunent floodplain regulations if the projected floodplain is adopted. ~ 6. A significant amount of land along Fourmile Canyon Creek is currently owned by the city including Open Space west of Broadway and east of 28th St.; the Pazk site upstream of Violet; a 13 significant portion of the former Elk's property; the Housing Authority's Foothills Project site; and the Library site east of Broadway. This public land ownership reduces the burden of property -~., acquisition from private landowners and presents an opportunity for the city to accomplish various goals and objectives including those of the flood control and drainage utility presented eazlier. 7. Significant areas in private ownership along Fournule Canyon Creek aze cunently underdeveloped as evidenced by the significant redevelopment activities that aze being planned or aze occurring. This redevelopment gresents an opportunity for the city to accomplish various goals and objectives including those of the flood control and drainage utility presented earlier. 8. Several elements of the IItP's recommendations aze cunently part of the city's floodplain management and regulation program including a flood forecasting and early waming system, public education regazding flood insurance and regulation of first floor building elevations within the 100-year floodplain. 9. An early waming system exists for the Fourmile Canyon Creek basin and includes rainfall gauges that aze monitored by the County Emergency Notification Center. Rapid rise stream gauges could be installed to supplement this system and provide additional infortnation emergency management personnel. However, rapid rise stream gauges may not provide adequate supplemental information to assure area residents aze notified prior to the onset of flooding. 10. Floodproofing of residential and commercial structures may have limited effectiveness in r~ reducing property damage and loss of life due to the difficulty in enforcing on-going maintenance ~ of floodproofing elements on private property. This problem is acknowledged by the Federal Emergency Management Agency since floodproofing of residential structures does not reduce flood insurance premiums. 11. Within the 100-year floodplain, the cost of flood insurance is approximately $S00 per $100,000 of assessed structure valuation. The insurance costs would be significant based on the number of structures encompassed by the projected flood plain. These costs would be reduced if a lazger drainageway is constructed. As stated above, floodproofing residential structures will not reduce flood insurance premiums. 12. The benefit/cost ratio has been calculated with respect to future damage potential only and does not account for other project beneSts and impacts. These include flood insurance premiums, wildlife habitat, water quality, recreational, transportation and aesthetic. These benefits and impacts are significant and should be considered in the decision making process. 13. The 100-year flood is an conceptual flood event used as a basis for comparing the magnitude and extent of various flood events. The azea encompassed by the conceptual 100-year flood event 14 ^""~ is also used for detemuning flood insurance premiums. However, it must he acknowledged that .~.~-, lazger floods such as the 500-yeaz flood will occur and should also be considered. As an example, ,,,, the Foothills Housing site is developing in a manner that will provide protection to structures from the 500-year flood. Although 100-yeaz flood mitigation would remove properties from the mapped azea of the 100-year floodplain, these same properties may still remain in the 500-year floodplain. Therefore, emergency preparedness and response including flood forecasting, early warning and disaster coordination and assistance would still be important components of any flood mitigation alternative. 14. There will be a net long term benefit to wildlife habitat and water quality due to securing a lazger drainageway, although there will be short term negative impacts due to the need to remove e~sting vegetation. The resulting wider drainageway will accommodate a greater variety of environmental features including wetlands, other riparian azeas, water quality ponds, grasslands and trees. 15. There is a benefit to transportation and recreation due to securing a larger drainageway based on need for public ownership of continuous easements along the drainageway that could be defined to allow public access where appropriate as indicated in the North Boulder Subcommunity Plan and Greenways Master Plan. 16. There is an aesthetic benefit to securing a larger drainageway based on the proposed extensive landscaping and restoration that will simulate a natural stream. Flood Control and Drainage Utility Goals and Objectives The goals and objectives of the city's Flood Control and Drainage Utility aze presented in Attachment A. Most of these goals and objectives relate directly to the analysis of alternatives for Fournvle Canyon Creek and should be considered in the decision making process. Utilities Division staffranked each alternative according to its ability to satisfy these goals and objectives as follows: 1. Love & Associates Alternative 2(100-yeaz drainageway design) generally satisfies these goals and objectives, however the capital project funding need is high. All structures aze removed from the 100-year floodplain and the estimated future damage potential is reduced to appro~cimately $1 million. All structures would be removed from the high hazazd flood zone minimizing the life safety threat. These benefits require considerable capital project funding and the benefidcost ratio is 13. 2. The Independent Review Panel Alternative (less than 100-yeaz drainageway design) is ranked second in satisfying these goals and objectives. Less capital project funding may be necessary and the benefidcost ratio may be greater than 1(although this has not been evaluated.) Numerous structures would remain in the 100-year floodplain although floodproofing these structures would reduce the damage potential. ~^°°^ 15 ~ 3. Love & Associates Altemative 1(50-yeaz drainageway design) is ranked third in satisfying these goals and objectives. Less capital project funding is necessary and the benefitJcost ratio is ~ 1.64, however 55 structures would remain in the 100-year floodplain and the future damage potential is reduced to less than $4 million. The alternative does not include removing structures y~ from the high hazazd flood zone and so a life safety threat would still exist although additional flood forecasting and eazly warning may reduce this threat. 4. Love & Associates Alternative 3(maintain existing floodplain configuration) is ranked fourth in satisfying these goals and objectives. No capital project funding is required, however the present worth value of estimated future damage potential is high at appioximately $26 million. Numerous structures (40-50) would remain in the high hazard flood zone and so a life safety threat would still exist. The above ranking however does not acknowledge other competing flood mitigation and drainage needs in Boulder. Boulder Creek, Goose Creek, and South Boulder Creek all present significant potential for flood damage and threats to life safety that should also be considered when allocating limited flood mitigation resources to Fourmile Canyon Creek and related North Boulder flood hazazds. Attachments A. Fourmile Canyon Creek Major Drainageway Planning - Phase A Report - Altematives Analysis Executive 5ummary dated June, 2000 ~ B. Wonderland Creek - Floodplain Analysis and Delineation Study and Potential Flood Damage ,,,,, Estimates Summary Memorandum dated June 28, 2000 C. Independent Review Panel Findings and Recommendations dated May Z, 2000 D. Drainage Utility Master Plan Update - Goals and Objectives dated October, 1999 16 ,.~ ATTACffiVIENT A ~ ,~, FOURMILE CANYON CREEK MAJOR DRAINAGEWAY PLANNING PHASE A REPORT ALTERNATIVES ANALYSIS EXECUTIVE SUMMARY (7une, 2000) By Love & Associates, Inc. Anderson & Company The development, evaluation, and recommendation of floodplain alternatives to mitigate existing flooding within the Fournule Canyon Creek floodplain aze presented in this repoR. This effort is jointly sponsored by the Urban Drainage and Flood Control District (iJDFCD) and the City of Boulder (City). Love & Associates, Inc. was the lead consultant for this project that, in cooperation with the Project Sponsors and Anderson & Company, has prepared this alternative evaluation report. Puroose and Obiectives ,~»- The purpose of the study is to analyze the existing and future drainage conditions with the Fourmile ~,,,,. Canyon Creek floodplain, develop alternate drainageway planning concepts to mitigate e~cisting flood damages, and prepare a preliminary design of an alternative selected by the Project Sponsors. The study is divided into two phases. The first phase (Phase A) ofwhich this report is a part covers the hydrologic, hydraulic, and altemate evaluation aspects of the project. The second phase (Phase B) will cover the preliminary design of the selected alternate. Plcmning Process The planning effort began in 7une of 1999. Since that time, a series of progress meetings have taken place to exchange information and discuss ideas and findings of the study. The progress meetings were regulazly attended by representatives of the sponsoring agencies as well as Boulder County. Concunent with the progress meetings, a series of public meetings were conducted to discuss the planning effort and solicit public input. An Independent Review Committee (IRP) was convened to review the data, methodologies, assumptions, and recommendations of the planning effoR. A discussion ofthe various alternatives investigated to mitigate flood damages and a recommendation of a preferred altemative were presented in a Draft Phase A Report, date Mazch 10, 2000. Many of the review comments on the Draft report received from the Project Sponsors, Boulder County and concerned citizens were incorporated into this Fina1 Phase A Report, dated 7une 9, 2000. ~^*"^ A-1 w The Project Sponsors will now review the Phase A report and make a decision on the alternative that is to be studied in greater detail in Phase B of this planning effort. In Phase B, the consultant will prepaze a preliminary design of the altemative selected by the Project Sponsors. The type, size, location of various improvements will be developed in greater detail. In the process, cost estimates will be refined and the relative priorities and phasing of these facilities will be identified. A final Phase B report will be published following selection of the prefened alternative. The Phase B report will serve as planning tool for the Project Sponsors and private development within the Fournvle Canyon Creek floodplain. BackQround Information The study azea, shown in Figure 1-1, includes appro~mately four (4) miles of the Foumule Canyon Creek floodplain from the mouth of the canyon to just downstream of the Soulder-Longmont diagonal (SH 119). Major drainageway planning documents were previously developed for Fourmile Canyon Creek by Greenhorne & O'Mara, Inc in 1984 and 1987. Due to recent development that has occurred in the floodplain and inaccuracies in the original studies the City ofBoulder commissioned a re-study of the Fournvle Canyon Creek Floodplain in 1997. Love & Associates was retained by the City to complete a re-study and draft results were presented in Fournvle Canyon Creek Floodplain Study and Letter oflVfap Revision, dated May 18, 1999. ~ The draft restudy indicated significant problems with the original study, resulting in additional properties located within the Fourmile Canyon Creek Floodplain. Of particulaz importance, the re- study identified reaches of Fourmile Canyon Creek west of 19`" Street, where, once the channel ~ capacity is exceeded, flood flows overtop the south bank of the creek and flow in a southeasterly direction towazds Wonderland Creek. These "spill flows" result in a reduction of flows in Fourmile Canyon Creek downstream of 19`" Street but also result in an increase in the flows in Wonderland Creek. During the 100-year flood, approximately 3,300 cubic feet per second (cfs) is in Fourmile Canyon Creek neaz the mouth of the Canyon, of this amount approximately 1,600 cfs will overtop the south bank spill and flow to Wonderland Creek. The remaining 1,700 cfs will remain in the Fourmile Canyon Creek Channel. DamaQe Analvsis All property, structures and infrastructure within the 500-yeaz floodplainwere included in the damage analysis. The damage analysis was calculated using the UDFCD Methodolo¢v for Evaluation of Feasibilitv: Multi-7urisdictional Urban Draina¢e and Flood Control'Proiects. Flood damages were calculated for the 2-, 5-, 10-, 50-, 100-, and 500-yeaz flood events. For the economic analysis, a 50- year project life was chosen, which conesponds to a typical structure life. A 6% annual interest rate was selected, which corresponds to the cost of bonowed capital for the entities involved and a 3% annual rate of intlation was assumed, The net discount rate used in present value calculations was 3%. The total present value of damages in the entire Fourmile Canyon Creek 500-year floodplain A-2 ,,,,, was estimated to be approatimately $ 26 million dollazs. ..... ~,., Identification of Potential Flood MitiQation Alternates Eazly in the study, a broad range of altemates were identified. These alternates were screened following an analysis and detailed discussions held during progress meetings on a reach by reach basis. An environmental assessment and oppoRunities analysis was undertaken by P. Kaia Anderson of Anderson & Company, Inc. This analysis utilized an eactensive biological database, which had been collected on the City of Boulder stream tributaries, including Fournule Canyon Creek. Habitat assessment matrices were developed to display the relative ranking of each reach of stream utilizing the previous studies. Wetlands and notable natural features were recognized. Environmental hazards and geomorphology was discussed. Environmental goals and objectives were developed and channel treatment concepts discussed. Flood engineering and environmental concerns were then molded into an alternate evaluation analysis for long term and short term benefits for the three final alternates: Alternate 1, 50-yeaz channel improvements; Alternate 2, 100-year channel improvements; and Alternate 3, maintain existing channel configuration. Alternates 1 and 2 have many similarities, since both would construct a natural type of waterway following the general historic channel alignment. The purist definition of a"natural channel" would be impossible to re-construct since road crossings have been constructed, the channel has been straightened, the banks of the creek have been filled, and development has encroached on ^'"' the natural floodplain. Therefore the term "natural channel" in this report is defined as a channel '~ designed by an inter-disciplinary team of engineers, geomorphologists, and biologists to emulate a "natural" channel. Altemates Analvsis The common similarities for Alternates 1 and 2 include the following: An expanded drainageway corridor must be secured. Widespread flood flows from the northwest need to be collected and directed to the creek corridor. Flood spills to the south of the creek need to be prevented for the design event. The drainageway downstream of Broadway needs to be improved to pass floodwaters collected and concentrated from upstream. Roadway crossings, also functioning as pedestrian underpasses, conveying the design storm need to be provided to pass flood waters along the improved drainageway. Transportation connections west of Broadway need to be constructed to replace access and maintain circulation provided by Rosewood Avenue. Irrigation ditch modifications need to be constructed. Pedestrian trails and crossings need to be modified or replaced. +~"` A-3 ~ Drop structures will need to be modified or constructed. Sediment capture facilities and wetland mitigation needs to be constructed. ,..~, • Bank stabilization is needed. • Downstream effects need to be studied. Alternate 3, maintain existing floodplain configuration would adopt the new floodplain mapping without proposing mitigation improvements at this time. Non-structural methods including flash flood forecasting and waming systems and evacuation plans would be implemented. Flood insurance and floodproofing of structures would also be recommended (at the private property owner's expense). Floodplain regulations would be strictly enforced. Post flood reliefwould be provided. This altemate requires no new funding, but may sacrifice opportunities to greatly improve Fourmile Canyon Creek and mitigate flooding in the future. A"Do Nothing" solution would offer no opportunity to mitigate spills and flooding to the south of Fourmile Canyon Creek and would offer no opportunity to eliminate flooding to the Waldorf or Crestview Elementary Schools. Reach by Reach cost estimates were prepued for the three selected alternates. Each of the alternates will still incur an expected damage during flood events. Examples of these damages would include isolated bank erosion spots in the constructed "natural" channel alternate or wide spread damage in the maintaining of the existing floodplain configuration altemate. One method commonly used to compare alternatives is the benefit/cost (B/C) ratio. In general the higher the B/C ratio the more cost effective an altemative is. In this study the benefitlcost ratio compares the total cost to unplement a flood cornrol alternative ~ withthe benefits that would be realized ifthat flood control alternative is implemented. The total cost to implement a flood control alternative was calculated as the sum ofthe construction costs, property acquisition costs and O&M costs required to implement an ahernative, as discussed.in pazagraph 8.6. The benefit that would be realized if the flood control alternative is implemented was calculated as the difference between flood damages under existing conditions minus flood damages that would be incurred after unplementation ofthe alternative. BenefiUCost Ratio =[E3cistine Flood Damaeesl - fFuture Flood Damaees with Alternative in Placel Cost to Implement Alternative A B/C ratio greater then 1 indicates the benefit received is greater then the cost to implement the alternative. A B/C ratio equal to 1 indicates the benefit received is the same as the cost to implement the alternative. A BJC ratio less then 1 indicates the benefit received is less then the cost to implement the altemative. Comparison of benefits and wsts must be made for the same time frame. Benefits stemming from reduced flood damages occurring annually over the life of the project cannot be compazed directly with construction costs, which generally occur over a short period of time near the beginning of the A-4 "°* project. All benefits and costs must be converted to either present value or annual amounts before ^^ comparison, using an appropriate discount rate, which accounts for the time value ofmoney. For this ~ study all costs were converted to present value. Present value calculations assumed a 50-yeaz project life, which corresponds to the typical structural life, and a discount rate of 3% (6% annual interest rate minus 3% annual rate of inflation). The benefit/cost ratio for each alternate follows: Alternate 1- 50-yeaz channel improvements =1.64, Alternate 2- 100-year channel improvements = 130, Alternate 3- maintain existing channel configuration = 0.00. There aze numerous intangible benefits that would arise from the implementation of flood mitigation improvements. By definition, intangible benefits are difficult to measure and aze not directly quantifiable in terms of dollar value or dollars spent for their usage. The intangible benefits that may be realized through flood mitigation include the following: • Improved traffic movement during floods. • Improved emergency response. • Improved public health and safety. • Improved environment, water quality and riparian habitat. • Lower flood insurance. • Potential for scientific, educational, historical amenities. • Increased property values. • Creation of cultural, educational, and scientific resources. `~' One additional intangible benefit, peculiar to residents of flood hazard azeas, is the peace of mind, which can be enjoyed by those, safeguarded from future flood damages. Because intangible benefits aze not directly quantifiable in terms of a dollaz value they aze not included in the benefidcost analysis. As a result, the benefitlcost ratios aze lower than what would be realized if dollar values were placed upon the intangible benefits. In addition to the benefidcost ratios presented eazlier, a number of additional evaluation factors should be considered when choosing a course of action to mitigate flood damages within the F~urrnile Canyon Creek floodplain. Below is a list of some of the potential evaluation factors: Evaluation Factors Flood Mitigation Life Safety Property damage Environment Temporary Disturbance Long-term benefit Groundwater °''~ A-5 ~... • Transportation Automotive ^"~ Bicycle/Pedestrian • Development/Re-Development Growth Management Affordable Housing • Aesthetics • BenefibCost Ratio • Cost • Recreation • Permitting Requirements • Impacts to Wonderland Creek • Conformance with other Planning Documents • Competing Priorities • Public Acceptance • Operation and Maintenance Bigger floods can and will occur. This statement holds true whether you aze talking about a 10-yeaz, 100-yeaz or 500-year floods. The Fourmile Canyon Creek floodplain has not had a significant flood in the recent past. The public awareness of the significance of the flood situation is low since many of the residents in the floodplain have not seen the results of a disaster, or had to clean up after a flood in their neighborhood. Recommended Alternate ~' The contract Love & Associates, Inc. has with the Urban Drainage and Flood Control District requires that the consultant make a recommendation as to the best overall altemate solution, taking into account a variety of information developed throughout the master planning process forFourmile Canyon Creek. It is the recommendation of this consultant that Altemate 2, "100 Yeaz Channel Improvements" be impiemented for this project. The 100-yeaz flood is currently the event that is most commonly regulated within the nation. If a lesser frequency flood event were selected to construct channel improvements, a residual "spill" floodplain would still exist and additional flood flows would be conveyed to the Wonderland Creek floodplain. ThisconsultantcannotendorseAlternate3-MaintainE~cistingFloodplainConfiguration. This is based upon intangible life safety issues and the number of homes remaining in the Fournrile Canyon Creek floodplain and the additional properties now known in the Wonderland Creek floodplain. Additional Considerations A-6 "'~ It is important to realize that the Fourmile Canyon Creek and Wonderland Creek floodplains aze ~ hydraulically connected. Due to topography and the limited channel capacity ofFoumrile Canyon ~ Creek, spills from Fournule Canyon Creek flow into the Wonderland Creek floodplain. Decisions made on floodplain management and mitigation within the Fourmile Canyon Creek floodplain have a direct impact on the Wonderland Creek floodplain. Results of the Wonderland Creek study aze discussed in a separate publication being prepared by City staff Regardless of the flood mitigation alternative selected, this Phase A study recommends the City of Boulder and Boulder County adopt the cunent floodplain mapping as the regulatory floodplain. The regulatory Wonderland Creek floodplain is also in the process of being updated to reflect the spill flows from Fournule Canyon Creek. All development within the existing floodplain should be in accordance with the City, County and Federal permitting requirements. *^ A-7 ~ ATTACHNIENT B ~'^ '~ WONDERLAND CREEK . FLOODPLAIN ANALYSIS AND DELINEATION STUDY AND POTENTIAL FLOOD DAMAGE ESTIMATES SUMMARY MEMORANDUM (Draft - 6/28/00) By City of Boulder - Utilities Division Staff Boyle Engineering Corporation This memo summarizes the results to date of the floodplain analysis and delineation study for Wonderland Creek. This study was commissioned by the city in consideration ofthe eacisting significant spill of flood waters from Fourmile Canyon Creek basin into the Wonderland Creek basin. Also addressed are potential flood damages along Wonderland Creek. It is anticipated that information concerning the ramifications of the spill will be needed for decision making regazding flood mitigation alternatives for Fourmile. BACKGROUND The city discovered errors in the currently adopted mapping for Fourmile Canyon Creek. This mapping artificially contains flood waters along the south bank of the creek west of Broadway. ,~.. ~` Fourmile Canyon Creek is unique in that a poRion of the e3tisting channel is perched within an alluvial floodplain. The stream channel is perched from the mouth of the canyon downstream to approximately 19th Street. In this reach, once the channel capacity is exceeded, flood water overtops the south bank and flows in a southeasterly direction towards Wonderland Creek. The spills occur along two primary segments of Fourmile Canyon Creek and flood waters would begin to spill during a 10-yeaz flood event. The first spill is west of Broadway where approximately 1,600 cfs spills during a 100-yeaz flood event and enters Wonderland Creek between just west of Broadway to just east of 15th Street. The second spill occurs between Broadway and Violet and amounts to apprwcimately 900 cfs during a 100-yeaz event. The majority of this spill (approximately 700 cfs) enters Wonderland Creek between just east of 15th Street to just east of 19th Street, while a portion (appro~cimately 200 cfs) retums to Fourmile Canyon Creek just west of 19th Street. More specific information regarding the spill flows from Fourmile Canyon Creek is documented in the Fourmile Canyon Creek Major Draiangeway Planning Phase A Report by Love & Associates. "~.", B-1 ~ W ONDERLAND CREEK FLOODPLAIN ANALYSIS AND DELINEATION STUDY The study considered the azea between Wonderland Lake and Foothills Pazkway. Hydrology The study of Wonderland Creek provided for the analysis and delineation of the floodplain under two different hydrology scenarios for the azea east of Wonderland Lake to Foothills Pazkway. The &rst scenario (Scenario A) utilizes the recently updated hydrology for Wonderland Creek, assuming no spills from Fourmile Canyon Creek. The updated hydrology was prepared by Boyle Engineering Corporation, using the latest models and incorporating revised drainage areas, rainfall amounts, and routing coefficients. The second hydrology scenario (Scenario B) superimposes the Fournule Canyon Creek spill flows, developed by Love and Associates, onto the updated Wonderiand Creek flows. Although runoffhydrographs have been developed for the 2-, 5-, 10-, 50- and 100-yeaz return period flood events, the focus of the impact assessment of Fourmile Canyon Creek overflows on Wonderland Creek is the 100-yeaz event. A comparison of the Scenario A and Scenario B 100- yeaz peak flow values at selected basin nodes is presented in Table 1 below. For additional comparison, the existing regulatory 100-year peak flows developed in 1983 aze included in the table. TABLE 1 PEAK FLOOD DISCHARGE COMPARISON WONDERLAND CREEK Node Comment (Basin Outlet) Intersection Location 100-Year Flood Peak (cfs) Regulatory Scenario A Scenario B 1983~ 19992 19993 802 ~ Broadway 802 + Spill Broadway 69 14`" Street 803 Centennial Middle School 804 28'~ Street 86 Kalmia Avenue 805 Foothills Pazkway 806 Goose Creek 426 427 427 775 - 1308 - 422 2575 989 633 2636 1135 805 2666 - 544 1780 1300 1080 1807 1415 1137 1804 ' Includes single 393 cfs spill flow from Fourmile Canyon Creek 2 Updated, with no spill flows included. ' Updated, with two spill flows of 1623 cfs and 901 cfs, totaling 2524 cfs. /'-~ ~ g_2 " ~°~, Floodplain Delineation ~ ""' The flood plain boundaries for these two scenarios have been delineated utilizing the City's electronic topographic mapping. Please refer to the attached drawings. The topography was compiled from aerial photos taken in April 1993. The mapping was completed to National Map Accuracy Standards for a 1-inch = 100-feet horizontal scale and a 2-foot contour interval. The floodplain delineation is limited to the stream reach upstream of Foothills Pazkway where the greatest affects of the spill flow will most likely be experienced. For Scenario B, approximately 40 additional structures (mostly residential) are inundated during the 100-yeaz flood through this azea compazed with Scenario A. ` During the process of identifying the scope of work for delineating the floodplain for Wonderland Creek, it was speculated that most of the peak flows under the 100-yeaz flood would spill from the Wonderland Creek drainage-way and never reach the stream segment downstream of Foothills Pazkway. However, it has been determined this is only partially true and additional floodplain analysis and delineation is necessary along Wonderland Creek east of Foothills Pazkway to its confluence with Goose Creek for a complete assessment of this scenario. Under Scenario A, all flood waters are contained either in or alongside the Wonderland Creek channel for floods up to the 100-yeaz event, except just upstreain of 28`~ Street. At this location some spills occur over the south bank. Most of the spill continues south to Goose Creek. Under Scenario B, however, Wonderland Creek will spill more water from its south bank under the 100- '~ year event in a similaz manner to Fourmile Canyon Creek. The eafisting concrete box culvert ``" under 28th Street has the capacity to pass only about 460 cfs without causing a spill. The spill or overflow of approximately 1,900 cfs will most likely occur between the two condominiums on the south bank of Wonderland just upstream of 28th Street. Overflows may also occur a short distance upstream at the Winding Trail bridge. All these overIlows would head south and would eventually make their way to Kalmia Ave. Some of the overflow would cross Kalmia and continue south towazds Iris Ave. Most of the overIlow would head east along Kalmia to 28th Street. When the flow reaches 28th Street, some would cross over and flow back to Wonderland Creek, while the remainder would head south to Iris Street. At the intersection of Iris and 28th Streets some of the flow would crosaeast and flow back to Wonderland Creek, while the remainder would flow south to Goose Creek. The precise locations and paths of the overflows have not been delineated as part of the cunent study. Therefore for this scenario to be completely assessed, additional floodplain analysis and delineation is necessary for the azea along Iris Street to its intersection with Wonderland Creek and along 28'" St. south to Goose Creek and along the Goose Creek drainage way to its confluence with Boulder Creek. It is estimated that approximately 60 percent of the peak overIlow or about 1,200 cfs would eventually return to Wonderland Creek. Therefore, downstream of 28th Street the peak flow in '"~ B-3 .,..~ Wonderland Creek under Scenario B is approximately 1800 cfs. The remaining overflow of 700 cfs would flow to Goose Creek. Because of e~cisting conveyance capacity along the west edge of ^'"~ 28th Street, overflows less than 350 cfs could all flow to Goose Creek. POTENTIAL FLOOD DAMAGE As part of the Fourmile Canyon CreekMaster Plan Draft Phase A Report, Love & Associates estimated the Fourmile Canyon Creek average annual flood damages. The average annual flood damage was estimated using a complex analysis approved by FEMA and UDFCD. . The analysis estimated the damages to structures based on the 2, 5, 10, 50, 100 and 500-year storm event based on their probability of exceedence. The result was a composite annual flood damage estimate for the drainage basin. Love and Associates estimated the damages by each reach in the Fourmile Canyon Creek drainage basin. The Fournvle Canyon Creek annual flood damage was estimated at $1,037,000. This figure represents approximately 200 structures in the drainage basin. This level of detailed analysis was not performed for the Wonderland Creek drainage basin. The Wonderland Creek flood damages were estimated based on the Fourmile Canyon Creek annual flood damage results from the Fourmile Canyon CreekMajor Drainageway Planning Phase A Report. The Fourmile Canyon Creek total annual flood damage estimate of $1,037,000 represents appro~umately 200 structures which computes to about $5,200 per structure. City staff estimated the Wonderland Creek total annual flood damage using the $5,200 per structure figure multiplied by the number of structures in the Wonderland Creek basin affected by the 100-year storm event. There are 11 structures in the Wonderland Creek basin affected by the 100-year ^+ storm event in Scenario A which includes flow from the Wonderland Creek basin only. There are "" 50 structures affected in the Wonderland Creek basin in Scenario B which includes the Fourmile Canyon Creek spill in addition to the Wonderland Creek flow. Table 3 shows the Wonderland Creek potential annual flood damages. These figures aze preliminary and their accuracy is judged to be +/- 25% relative to the Love & Associates' more detailed analysis. The annual flood damages for the 11 structures affected in Scenario A is estimated at $57,000. The annual flood damages for the 50 structures affected in Scenario B is estimated at $26Q000. The calculated present worth for Scenario A and Scenario B is $899,000 and $4,086,000 respectively. TABLE 2 WONDERLAND CREEK B-4 ""` POTENTTAL ANNUAL FLOOD DAMAGES ~ `" I Scenario I Affected Structures I Annual flood Damage I Present Worth I A I 11 I $57,000 I $899,000 ~ B I 50 I $260,000 I $4,086,000 Scenario A: Wonderland Creek flow only Scenario B: Wonderland Creek flow + Fourmile spill Note: These figures are preliminary and their accuracy is judged to be +/- 25% relative ta the Love & Associates' more detailed analysis. It should be noted these damage estimates are limited to the stream reach upstream of Foothills Parkway for which the floodplain analysis and delineation has been completed. Additional damages may occur along Wonderland Creek downstream of Foothills Pazkway and the azea along 28'~ St. that results from flood water spilling from Wonderland Creek upstream of the 28`" St. culvert as discussed earlier. For a complete assessment of this scenario, the aforementioned additional floodplain delineation work would need to be performed and potential damages calculated. The potential for flood damage in these azeas should be considered and the present worth cost of these damages may be as high as $1-2 million. Also, for a more accurate assessment of the potential flood damages, the detailed methodology used in the Fourmile Canyon Creek Phase A report should be used. ,.•~ °"' Attachment: Floodplain Delineation Drawings 1-6 ~ B-5 ~..r ATTACHMENT C ~ ~ INDEPENDENT REV~W PANEL FINDINGS AND RECOD'IlVIENDATIONS NOTE: The IItP findings and recommendations were based on a review of the draft Phase A report, not the final report addressed in this memorandum. ~..,. ,*~• G 1 ~~.. 2 May 2000 Mr. Bob Hazberg Department ofPublic Works P.O. Box 791 Boulder, CO 80306 Deaz Mr. Harberg, Our thanks to you and the City of Boulder for the opportunity to serve as members of the Independent Review Panel of the Fournrile Canyon Creek Phase A Report. During the course of our work we conducted a field trip of the Foumule Canyon Creek floodplain, participated in public meetings, and met and deliberated to come to consensus on the original questions posed for our review (a chronology of our activities and a memo on the geomorphology of Fourmile Canyon Creek aze included as Attachments 1 and 2). In addition, we have drawn some interim conclusions about the adequacy of the study process and the alternatives presented for consideration. These findings are described in Attachment 3. Based on these findings, we believe that further alternatives should be considered by the City of Boulder for flood mitigation on Foumule Canyon Creek. These alternatives, while obviously not presented in as much detail as those in the Love report, are described in Attachment 4. ~ Throughout our work, we received advice and assistance from three people and we would like to acknowledge and thank them. 7ohn Rold, former Colorado State Cseologist, accompanied us on our field trip and provided valuable insights. Elizabeth Black participated in some of our ,~ meetings and provided excellent information on the history of flooding on Fourmile Canyon ,,,,,, Creek. Molly Tayer skillfully facilitated our IltP proceedings. Without her assistance, we certainly could not have accomplished as much as we have so faz. We are interested in tracking the progress on this initiative and will be prepared to respond to staff and Board comments on their review of the Fournvle Canyon Creek Phase A Report, and its relation to the Wonderland Creek study to make further recommendations. On behalf of the Independent Review Panel, I remain Sincerely yours, Mary Fran Myers cc: Love & Associates Attachments C-2 ,» ~ .~ Attachment 1 ~ Independent Review Panel Chronology of Activities 7anuary 18, 2000 January 22, 2000 January 28, Z000 March 8, 2000 Mazch 15, Z000 Mazch 30, 2000 April 10, 2000 Apri124, 2000 May 2, 2000 ~... w First IRP Meeting IRP Field Trip ofFourmile Canyon Creek Field Trip Debriefing and Review Meeting Neighborhood Contacts Meeting Phase A Report Distributed to IRP IRP Meeting Phase A Report Open House Meeting IRP Meeting IRP Submits Initial Report and Additional Alternatives C-3 Attachment 3 Comments on the Fournule Canyon Creek Phase A Report from the Independent Review Panel William Bradley Brian Hyde Richazd Madole Mary Fran Myers Gilbert F. White Kenneth Wright 2 May 2000 I. METHODOLOGY A. Alluvial Nature A main chazge to the IltP was to judge the adequacy of the methods used to identify the flood risk on Fourmile Canyon Creek. Based on our review of the study and on the field trip, the IRP feels the various hydrologic techniques used were appropriate, and the data involved therein were the best available. One specific question had to do with the "fixed-bed analysis," since Fournule Canyon Creek flows on an alluvial fan. The IRP believes the "fixed-bed" assumption is ~R, proper because the Fourmile Canyon Creek fan is a composite fan made up of alluvium of `~" different ages whose tops stand at slightly different elevations. Most ofthe fan is inactive; modem activity is mostly on the south side. Thus, Fourmile Canyon Creek has a defined channel and a mappable floodplain; it is appropriate to consider it a fixed-bed stream. B. Split Flow The IItP believes that the study contractor has made a significant contribution in quantitatively defining the spill from Fourmile Canyon Creek to Wonderland Creek, with the split flow around Crestwood SchooL Using the split flow option in the HEC-2 water surface profile computer model resulted in a more accurate depiction of the flood risk. C. North Channel An historic channel is located north of the e~sting Fourmile Canyon Creek channel between the mouth of the Canyon and Broadway. The study does not reflect any water going down this channel during a 1% chance flood, but an earGer report indicated water would enter the channel and then be shunted back to the main channel. ffthe latter is correct, it should be shown on Figures 4-la (page 4-3) and 8-2a (page 8-11). C-4 '""" ~ ,~, D. Infiltration The study reports that the Fourmile Canyon Creek 7.4 squaze mile drainage basin has a 100-year flow of 450 cfs/square mile which may be conservative (i.e., on the high side) from a rural watershed with a fair amount of infiltration. The IltP has not made any detailed studies and aze not challenging that figure. We point out, however, that this may mean the 10- and 50-yeaz flows are also on the high end, which would overestimate projected spills and conesponding damages. II. DATA The IRP was asked to consider the appropriateness of the data used by the study contractor in the Phase A Report. In terms of the data used to prepare the flood map, the IRP is satisfied that the study contractor used the best available hydrologic data (i.e., the hydrology from the City's Flood Insurance Study). The IRP is concerned, however, that the Phase A report contains no estimates about debris flow and sediment load that in a major flood might cause serious blockage and diversions (see discussion in IV B, below). In terms of the data collected to assess damage potential and, therefore, contribute to the benefiUcost analysis, the IItP believes that without including the potential damages in Wonderland .,.. Creek, the study does not present a complete picture of the damages. As such, the benefitJcost analysis is flawed. Further, the IItP understands that the study contractor has extensive data (i.e., Srst floor elevations) on individual structures in the Fourmile Canyon Creek floodplain that is not included in the Phase A report. An analysis of this data that includes flood depth and velocity would present a much cleazer picture of the flood risk to different groups of those structures as well as a better sense of the effectiveness of using flood prooSng to reduce that risk. The contractor also has information on the likely consequences of flood flows of lesser frequency than the 100 year event. This should be specified as to flow. III. ASSUMPTIONS The IRP was also asked to consider the appropriateness of the initial assumptions made by the study contractor in preparing the Phase A Report. The Phase A report is based on a variety of assumptions, both in the modeling and in the alternative recommendations, and these must be kept in mind when evaluating the study results. The IRP believes that these assumptions (and their limitations) must be explicitly described and ~». GS i... explained in a prominent place in the report. Specifically, at a minimum, the study contractor should address the following issues and describe the impacts of the assumptions on the study ..~, outcomes: 1. What are the assumptions used in the hydrologic model, and what are the resulting confidence intervals? 2. The study assumes no blockage of the channel by debris flows, or blockage of bridges/culverts by sediment or other materials. Either kind of blockage would change the outline of the flood. 3. What were the assumptions made in selecting the channel treatment concept? IV. OTHER COMMENTS A. Integration with Wonderland Creek The Phase A report makes it cleaz that the floodplains and flood risks of Fourmile Canyon and Wonderland Creeks are hydraulically integrated. As such, the IRP believes that any recommended action for flood mitigation on Fourmile Canyon Creek must be proposed in conjunction with similar action for Wonderland Creek. B. Sediment The Phase A report does not address in a significant way the impact of accumulated sediment and debris on the flood risk in Fourmile Canyon Creek. Sediment and debris from the ,~, upstream basin might cause a constructed channel to become constricted and result in a premature ..s' overIlow of its right bank. The IItP believes this higlilights the importance of upstream land use management and that these issues must be addressed in the analysis of the flood risk and in the development of alternative recommendations for mirigation. C. Benefit/Cost Analysis In addition to the limitations of the benefitlcost analysis listed above (i.e., not including damages from Wonderland Creek), the IltP has two other concerns. First, the benefiUcost ratio for both Alternatives 1 and 2 aze very low (less than 1), which suggests that the prohibitive cost of a lazge channel will prevent any type of action being taken to mitigate flood risks on the Creek. Second, the benefidcost analysis offers no infortnation on the use of other floodplain management tools such as floodproofing or emergency waming and response, making it ne~ to impossible to assess the efficacy of altematives to the recommendations presented by the Phase A report (which essentially are `do nothing' or two versions of a`structural' project). D. Alternatives Akernatives 1 and 2 in the Phase A report aze variations of the samt recommendation (a C-6 ^* channel modification or a bigger channel modification), both of which are not cost-effective in ,,.,,,, typical flood mitigation projects, making them unappealing. Alternative 3, the "do nothing" „r„ approach, is similarly unappealing. The IItP believes that there aze other alternatives which should be considered in as much detail as have the recommendations in the Phase A report. These alternatives, which aze exemplified by the attached "Additional Alternative," suggest that a channel modification that could accommodate a 25-year event (or some other appropriately sized event) on Fourmile Canyon Creek be complimented with a floodplain management plan incorporating a complete range of nonstructural techniques and strategies to provide a comprehensive approach to dealing with the flood hazazd on the creek. The IItP lacks sufficient data needed to assess the exact size of channel modification and the specific mix of nonstructural techniques that would be appropriate to achieve the geatest benefit/cost. However, the IItP believes strongly that at a minimum, a comprehensive approach as described in the attached needs to have an extensive public education component so that residents understand their risk and assume responsibility for dealing with that risk through floodproofing and/or purchase of flood insurance. The IRP also believes that these alternatives should consider dealing with different portions of the creek corridor in different ways. For example, if there aze bottlenecks in critical areas (e.g., higher populated areas) or if the high hazard zone exceeds the chosen channel design capacity at some point, then more intensive engineering of the channel might be required. The IRP does not believe the entire channel needs to be addressed at the same level. r... C-7 ~ Attachment 4 Fourmile Canyon Creek Phase A Report Additional Alternative The Independent Review Panel (IKP), on the basis of the Love & Associates data and with IRP field and office reviews, has concluded that the alternative plans for the Phase A Report should include a floodplain management plan incorporating a wide range of nonstructural measures coupled with an appropriately-sized and cost effective flood channel from the mouth of Fourmile Canyon to Boulder Creek. This alternative would be premised upon the fact that floods lazger than the 100-year event will occur, that any sized channel would be subject to some degee of sediment and debris blockage, that channel overflows have occurred to the south during the last 100 years, and that a multifaceted program would best serve the north Boulder needs. Components of the recommended nonstructural floodplain management alternative would be comprehensive and would include many of the floodplain management strategies and tools listed in section 8 below. At a minimum, the plan would include the following. 1. Channel ~, The channel configuration would be designed to a size that would be cost effective after ,~, the potential reduction in damages from the other floodplain management tools and techniques ~ could be analyzed. The IItP does not have the information available to estimate the exact size of this channel, but it is likely that it would be smaller than the alternative (100-year) recommended by Love & Associates. The IRP believes the lazger channel tends to be too wide and too costly. It is likely that it is too expensive to be implemented, since the benefit cost ratio is poor at 0.6. A smaller channel would help to lend order to the existing chaotic drainage system in norch Boulder. It would carry a certain amount of flood water and would contribute to the potential of achieving a better benefit-cost ratio when coupled with the other components of the IItP recommended altemative. Spills from larger floods would occur in the same location as with e~sting conditions. The channel design would consider that there are different levels of present and fuhue exposure to damage from floods along various reaches and that different degrees of channel design frequency would be considered where the city felt it desirable to limit or eliminate a"high hazard" zone along the chaanel as defined by the depth-velocity factor of 4. 2. Fiood Proofing C-8 Basic data related to flood depth and velocities would be categorized by the degree of ~ damage exposure to provide for more defined flood proofing choices by area. Flood proofing measures effective for a wide range of floods would include a variety of building and development strategies such as: - Partial flood walls, where appropriate, to red'uect fast-flowing shallow water - Dry flood proofing of e~cisting structures - Wet flood proofing of existing structures - Purchase of residences/other structures and relocation out of the floodplain. The intent would be for the study contractor to tabulate buildings affected by various sizes of floods, including those higher than the 100-yeaz frequency, and choose the most appropriate flood proofing alternative for individual structures. The IltP recommends that the cost of flood proofing not be the sole responsibility of the building owner and suggests a cost-sharing program be established by the city. Flood proofing could significantly reduce the flood damage potential from any size flood event and conuibute to a better benefit-cost ratio. The existing condition shallow depths of flood overflows of generally less than a foot would mean that the first three flood proofing measures listed above could typically be both effective and economical. For flood depths geater than one foot, other floodpiain management techniques might be more appropriate. 3. Flood Forecasting and Early Warning --~ An early warning system should be initiated, with the warning triggered by storm forecasts in addition to high water alerts from the upstream basin. A stream flow gage should be installed in the upper basin to notify emergency personnel of rapid rises in water levels. The capital and operational costs would be determined. The city's existing program of flood waming and use of reverse 911 calls would be built upon for Fourmile Canyon Creek. 4. Flood Insurance Purchase of flood insurance by floodplain occupants would be encouraged and incorporated into the altemative plan. Workshops would be held to explain the benefits of flood insurance. 5. First Floor Building Elevations No new construction would be allowed that is not in compliance with the City of Boulder's current floodplain management regulations whict~ prohibit basements in the floodplain and require the lowest floor elevation of any new building in the floodplain to be two feet above the base flood elevation. C-9 6. Public Education Through public meetings, newsletters, and community leaders all interested land owners would be made aware of the range of promising floodplain management actions auailable to them as well as to the City, including potential cost sharing for flood proofing of eacisting structures. 7. Tributary Drainage Basin Management The Foofhills drainage basin, the source of flood runoff and sediment and debris for the Foumule Canyon Creek neighborhood, is key to the recommended plan. The bedrock of the basin provides an abundance of decomposed granite that is highly erodible when exposed. Sediment and debris could result in channel plugging, channel overtopping due to aggradation, and future downstream sediment removal activities. Increased flood potential due to upstream development would cause increased flooding and damages. For that reason, soil stewardship, wildfire control and management plans, and erosion control best management practices should be instituted in the upstream Foothills basin by the county commissioners. This would include additional appropriate county zoning and building regulations coupled with limitations on cutting and filling of steep slopes and strict development controls by the county consistent with the safety hazards that would otherwise be created. Public health, safety, and welfaze would be the basis for basin management. 8. Floodplain Management Strategies and Tools Floodplain management tools would additionally include some or all of the following items: ,,~e,, - Floodplain regulations - Zoning - Subdivision regulations - Building codes - Housing codes - Sanitary and well codes - Disclosures to property buyers - Design and location of utility services - Land acquisition and open space - Redevelopment - Permanent evacuation - Disaster preparedness - Disaster assistance - Land treatment - On site detention - Ta~c adjustments - Emergency measures - Post-flood recovery G 10 ,..,, ATTACHMENT D ~ DRAINAGE UTII.ITY MASTER PLAN UPDATE GOALS AND OBJECTIVES (October, 1999) By Utilities Division Staff A. Goal: Mitigate flood hazards and reduce the potential for property damage and loss of life. Obiectives: 1. Regulate new uses and development within the azea which could be expected to be inundated by a 100-yeaz flood. This 100-yeaz floodplain, for purposes of regulation, is divided into the flood storage area, the flood conveyance zone and the high hazazd zone. 2. In developed urban areas and where practicable and desirable, eliminate existing uses and construction within the 100-yeaz floodplain, flood conveyance zone or high hazazd zone that aze inconsistent with these regulations. The practicality and desirability should be assessed based on the following: ^~w' o comparison of costs and benefits o potential for loss of life o aesthetic and environmental issues o economic and Snancial resources 3. In developed urban azeas and where practicable and desirable reduce the azea encompassed by the 100-yeaz floodplain, flood conveyance zone or high hazard zone. 4. Where it is not practical or desirable to eliminate eacisting uses and construction or reduce the azea encompassed by the 100-year floodplaiq consider these objectives with respect to more frequent flood events, i.e. 25-year or 50-yeaz. 5. Where practical, provide emergency access along City streets during major storm events. B. Goal: Minimize routine storm drainage problems by providing adequate facilities along major drainageways. Obiectives: D-1 1. Design and construct drainageway facilities to mnumize damage to development and public infrastructure. ""` 2. Design and construct drainageway facilities to minimize erosion and limit impacts to water quality. 3. Design and construct drainageway facilities that are aesthetically pleasing and benefit wildlife habitat and accommodate recreation opportunities. C. Goal: Maintain eaisting drainageway facilities. Obiectives: 1. Provide drainageway improvements that reduce the expense and impacts associated with on- going maintenance. 2. Provide adequate drainageway easements and access for on-going maintenance. 3. Maintain flood flow design capacity, mitigating associated temporary impacts to wetland and wildlife habitat. D. Goal: Manage water resources to provide appropriate base flows and protect water quality and riparian habitat. ~ Objectives: ~ 1. Sepazate the crossings of irrigation ditches with major drainageways to eliminate the potential for damage to development and public infrastructure along the icrigation ditches and to secure a base flow in the major drainageways. 2. Secure adequate agreements with imgation ditches prior to routing E. Goal: Minimize routine storm drainage problems by providing adequate facilities aloug city right-of ways. Objectives: 1. Design and construct storm sewer and drainage swales to minimize damage to development and public infrastructure in accordance with the city's design and construction standards. 2. Design and construct storm sewer and drainage swales to minimize erosion and limit impacts to water quality in accordance with the city's design and construction standazds. D-2 F. Goal: Emergency management and insurance. " °~ Objectives: ~a...~ 1. 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'G_. ^.:~\';~~nr-` , , ~~nir.:~ ., _: ~`r~, ~ ~ ` NOTE: SEE FlGURE 8-3 fOR TYPICAL CHANNEL CROSS'SECl10NS - PROPOSED OROP ~ CENlERIINE OF CREEK ~'~- PROPOSED BRIOGE ~ SIRUCTURES OR CULVERT ~ ~ = S1RUCiURES RECOMMENDED PROPOSED CHANNEL ~~- t ~ ^_~ PROPOSED TRAII •~ ••• f~' FOR AQUISITION NADTH •............~ . ~ ~.~ Xw~,~ rr,r.....~... . ~;y~,a er~~ o.,;.±»zioo URBAN DRAINAC`~ AND FLOOD CONTROL DI3TRICT I MA~~IOryFi ~D~R~A~NA/~C~~~~Wy/A~~Y~ /P~L~.APIr/JG I AL7Efi1~WTE 2 IR~URE+e-2o ~ 1~YrOwW i-~ GY~11 M OY OOfC~.SSLQ~ rV\TYYLr VI'Y~IN\ Vf~\ 39 ~, ~. ~~ e~n.we e,~.~ o~e.3azdm_ eYTY OF BOU.D~i 100-YEAR CHAMB_ PACiE e-xt PFiA3E 'A' Fi~ORi 185' •• •• DUE TO E%ISTING EXISTING STRUCNRES THE FULL N10TH 735' CHANNEL MAY NOT BE AVAILABLE IN ALL REMOVE E%ISTING SEC710N5 OF THIS REACH. ~ IEVEE - ~ - ~FIANNEL N70TH COUID BE EXIST7NG I ( NAftRONED USING A MORE ~ CHANNEL ' 12.5 STRUCNRAL CHANNEL CRO55 6.5 45 -$ECTION, SIMILAR TO TMAi I \ 2.5 ~ Z~ SHOwN FOR REACH 6A. T1I5 5.6 ---- J -y~1- SHEET. /5 .5 1.5 ~ ~3.5 Z ~ Z 2.5 _ __ _ \ ~ ~ /~~____ LOWER E%ISTING PROPOSE~ \3 p I ~0 TR/.il. CHANNEL PROPOSEO ~AIL 25~ 90' 20' S0' CHANNEL MA 78~ 32' REACH 28 MA ALiERNATE 2- 100-YEqR CHANNEL REACH 3 ALiERNAiE 2 - 100-YEAR CHANNEL ~ 160' ._. _~ E%ISnNC LEVEE EXISnNC TO REMAIN CHANNEL I I _ _ ~ ~4 1.5\ I /7.5 ~ ~ 2~ 0~ I \0 ~2 PROPOSED LOWER EXISTNC p1qNNEL TRAIL 25' 65' 20" 50' MA REACH 28 ALlERNATE 1 - 50-YEAR CHANNEL • I I ~ ~~- -- ' 250' EXISTING CHANNEL PROPOSED CHANNEL REACH SA ALTERNA7E 2 - 100-YEAR CHANNEL EXISTING ` . / I ~ CHANNEL ~ ,~u~l.* - - _ ~ ~ PROPOSED 1 ~ piANNEL ~ 50' ~ 11 EXISTING , ~ CHANNEL 8.5 , 8_5 ~ 25 1 ___ ~ _~ \ i ~-_ '_ ___' 3.5~ ~IJ / \ ~ TRAII OR 3 3 0 0 Z5 MAINTENANCE ACCE55 PROPOSED CHANNEL -~ao~ T 30• ~ so• z5 I T MA REACH 4 ALTERNA7E 2 - 100-YEAR CHANNEL • CHANNEL wiDTH COULD BE NARROwED BY USING A MORE STRUCTURAL LNANNEL CRO55 SECTION, 9MIL4R TO 7HAT SHONN FOR REACH 6A, THIS SHEET. ExI511NG ~~~666'''yyy ~~ ---- ~- CHANNEL -~-- --- 5 4.5 I 5.6\ MAINTENIAN~CE 2.5 7'S 0 I a~ / ACCESS PROPOSED TRAi~ CHANNEL 58' 32' 25' MA REACH 3 ALTERNAlE 1 - 50-YEAR CHANNEL ~ a - _ _ _ TRAIL 25' MA / EX157INC / I CHANNEL 8 ' _ _ _ 1.5 ~ 1.5 2 4.5 _ _--_ Z O I~ - -_-- TRAIL ~A~~ ~ PROPOSED CHANNEL~ 25' MA 45' I 20' 45' 25' g REACH SA ALTERNA7E 1 - 50-YEAR CHANNEL N V i I~16~ R~J~1~ 1~ X ..~ .. ........ .....~...,. O~c9^M BY.~9S_ Datc 3 l 00 o ou wa.^ e oaee s ~ o0 3 ~•~••• ~ •~-~`~ r ~ p W No ata Ra~nsm ~pp a. . '~ b+++s++~ GscYaE B ~ pets3 1] 00 REMOVE AVENUE __--10: (rm son+ REACH 4 A~7ERNAiE 7 - 50-YEAR CHANNEL EXISTNG CHANNEL l.F1HNNtLD ~ EXISnNG ~ CHANNEL LOWER I! TRAII I 10 g - _~ 3 6 i r .~I~ ----- z u o ~,s Z PROPOSE CHANN~ I 32' I 17' {I 26' 25' ~~- T~ I ~ MA REACH 6A A~lERNAlE 2 - 700-YEAR CHANNEL REMOVE ROSEw000 EXISTING A~ENUE ROAOWAY / CHANNEL 7.5 70- ~ g ---_ ____- p i 3 /_ ~I J f _ 3.5 3 PROPOSED EXISTING CHANNEL 7RAIL I` '2 T ZZ~ I 2,~ ~JI.. zs• T I MA r r T ~n ~~ REAqi 6A REACH 58 ~. nLL secna+s ALTERNAiE 1- 50-YEAR CHANN0. LOOKINC DOWNSTREAM ALTERNAiE 1- 50-YEAR CHANNEL 2. MA ~ MAINTENANCE ACCESS URBAN DRAINAGE AND FLOOD CONTROL DISTRICT I ~~R ~~~WAY PLANNWG I p,~~~p~ ~& 2 CtTY OF BOULDER FOl1RMLE CANYON C~C TYPICAL CAOS3 SECTIONS PHASE 'A' R~OflT G A F. 7'~40' HOlER. 1"~~O' VERT. q~ 8-3 PAC~ 8-14 22' 16' 22' 25' MA REACH 58 ALTERNAlE 2 - 100-YEAR CHANNEL ~ ~~ --_ _ ~- 1r~iTY OF BOULDER, COLORADO ~- =~ - _~~~ ... ~ """ --- -- WONDERLAND CREEK ~~ DRAFT ' 2 100-YEAR FLOOD PLAIN DELINEATION 6 o , i :t:`:-. ~:: ~ = ~/ ~y ~ ,~ ' F~ ~ ~ '` i.i €<;: ~:' ~A ~^\ ~-~ ~ ~ Yi\ Y~~ ^ I ~~~,~~ I~b, ° ~~ ~~ ~'TY OP BOULDER, COLORA~O I ~ I ~ ~ ~~ ~ ~l I` ,~o ~ ~ ~ ~ ° _ ~~ _. _ ~ '_ ~"'_ o ~ ~ _ ~ MsY ~e~o ,~...~~ ~.r a ~...~ ~ ~~ti ~~ ; WONDERLAND CREEK ~~ DRAFT 3 100-YEAR FLOOD PLAIN DELINEATION 6 ~! ~~~/ ~' R ~~~ `~ ~_ ~ ~,(' _`-~__` /r i ~ i~ _' ) ! ~i ~ ~ j I ' ~; ~ I ~+ rl ~ ; -~/ / , ~~ ~ \ ~~ ;~""' / ~~ ' J - ~ ~ ~ 1 - v ~~ ~l . ~o a - ~ ~~ _ oa . o , ~~ ~ ~ o ~~ ~ ~ ~ ~~ ; } o~_ ~ o~ :`~° X /G/~ \~ ~ ~ / u ~ ~ ~ .~ ~~' x o x O ~ ~ ~ ~ ~~ , ~ ~ ~ ~ \ > 0 ^ ~ - b._.iTY OP BOULDER, COLORA~O - - .~~ ° ,-, ~ ,~:,~ - ~ ~ ~~-~ ~y~ ~ , ~,~ ~ ~ '~` ~ ~~ ~ _ c~ t, JM1 ~~ ~--- _,,._ - .~ _~~ ~_,.~.e. ~ ~ "'°• -_= -- ~ ~ < --,~, , ~ ~; . , , ~ . ::: ; .:: ; : ~ ~:~; . :~:::::: ::: . ~ ~~ ,~` ~r ~ W % ' ~ ~,_ ~ 0 W . 4 ~r~-j ~~ ~ r ,,;~ ( ~ "s~, ; < < t~~~~ \~ ^ ~ ~i \ O ~N i i ~ ~ l~ w ~ ~ WONDERLAND CREEK ~• DRAFT 4 100-YEAR FLOOD PLAIN DELINEATION 6 Il 1 / / <:'.~'~:'~]~':>:> / /11 / I~I/\ \ ~V 1/CN \ M /\.C\ \ ^ ~ ~ ~_.~___ _' J ~ ~~~ - , ~~ i~a~s a~ L ~ ~n _ / ' - ~ 1 ~ __~~ , ~ `..~~-~ :::•:;.:., ~~ __ _ Z , \ ~ o O ; / ° ~ _ _~ Q ~ ~-'_' - -- ~; -~°T ~, . ~ Z W J ~ `~ ~ o ~ W '0 ~~ ~ U Z ~ - ~` ~~-- '~ ~ ~ ~ Q ~ ' 's ---- ~ ~ti~~ ~t~~~- Q ~ a ~~ " --- -- -- - -- / ~~_ °~ ~ -- . - ~ W ~ O `\\ \~~ ~ ;:l ~ Z O . ~ ~ / -`'~.~ ~~ \~ ~ ~ ~ lJL / ~ O ~ !~ ~, i ~ ~ ~ ~ ~ 9 ~ ~~/\ \. 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' j ~ ~ ;' ~ _ ,.{ ~ ) '~;~ _ w 1~~ s ~~.\ ~ ~ - i {\ l (\ ar'y ~" ? ~ St\ ~ CC ~ j ^~ ~•\ `` ~'(~~ /.+!' ~ J 3 t ~` ~~`l~ ~ ~`rj.~ `' , `~ , ~ .:; ~g t~'y ~ Y` x ' ~'~. ~ ~~ ~-r~ ~ ~ , f /"~ ( ~ ~ :: . t .~ f,~ ~ ` ~ Y~ '` •\~\t~ I'~l. '~ k ~~ ^'%,,,~ ~ ~~ ` ;:~%:::: I ~ l~~ ~ ~` ;~ ;;;°~~ _ \~.~ <~~\ `~%M ~.,>~ _ ~, 'Jr~'/ \~~`` ,'~ _s~~\ ~~ ~ ~ ~ ~ ;~::\:_' . • , i ~ ~~~~ ~~ , .~ , O . 0 oQ `~,/ ~ ~~ ~ 0 ~ U ~~ o~~~vu~~~ ~ o ~ ~oaQ ~ o~ ~d o ~ ~° ~' ~ O DO ~ ~ D~a ~o ~O Q° ~ ¢ ~ ~ ¢ o¢ , , ° ~ ~ ~ ¢ ~ ~`~ _~~~ ~ ~;'`~.~ ~~`~~~~~~~~~"/~/-"~~~~~` d~,,.''TY OF BOULDER, COLORA~O ~' ~ ,~, , , ~ i'~~. ~~ ~~~~~ ,~~ v" ~~~`~ ~ ~ ~ ' ~ I~~ ~ ~ I' ~~ ° , ~ o ; •• -~ i 1 SGP ` I ~ „ ~ ~ ~~ ~ - .~~ ~_ _ ~. ~ ..,,. _ _~ ~ ~ .. .__..~...._. ,,,,, __ ... ~ --- --- ~ , ~ ~ ~ WONDERLAND CREEK ~~ DRAFT 6 100-YEAR FLOOD PLAIN DELINEATION 6 C ~~ ~ . ~~~~