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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. Improved environment, water quality and riparian habitat Lower flood insurance. . . I I historical amenities educational, Potential Increased property values Creation of cultural, educational, for scientific, . . . I 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 alternate solution, taking into account a variety of information developed throughout the master planning process for Fourmile Canyon Creek. and scientific resources. One additional intangible benefit, peculiar to residents of flood hazard areas, is the peace of mind, which can be enjoyed by those, safeguarded from future flood damages I be Channel Improvements" "1 00 Year Alternate 2, consultant that It is the recommendation of this implemented for this project Because intangible benefits are not directly quantifiable in terms of a dollar value they are not included in the benefit/cost analysis. As a result, the benefit/cost ratios are lower than what would be realized if dollar values were placed upon the intangible benefits. I The lOa-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" floodplain would still exist and additional flood flows would be conveyed to the Wonderland Creek floodplain. This consultant cannot endorse Alternate 3 - Maintain Existing Floodplain Configuration. This is based upon intangible life safety issues and the number of homes remaining in the Fourmile Canyon Creek floodplain and the additional properties now known in the Wonderland Creek floodplain. In addition to the benefit/cost ratios presented earlier, a number of additional evaluation factors should be considered when choosing a course of action to mitigate flood damages within the Fourmile Canyon Creek floodplain. Below is a list of some ofthe potential evaluation factors: Considerations It is important to realize that the Fourmile 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 Fourmile Canyon Creek floodplain have a direct impact on the Wonderland Creek floodplain. Results of the Wonderland Creek study are 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 current 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 Fourmile Canyon Creek. Flood Mitigation Life Safety Property damage Environment Temporary Disturbance Long-term benefit Groundwater Transportation Automotive BicycleIPedestrian Development/Re-Development Growth Management Affordable Housing Evaluation Factors I I I Additional . . I I I . . I County and City, the with in accordance should be All development within the existing floodplain Federal permitting requirements. Aesthetics Benefit/Cost Ratio Cost Recreation . . . . I Permitting Requirements Impacts to Wonderland Creek Conformance with other Planning Documents Competing Priorities Public Acceptance Operation and Maintenance . . . . . . I I I Bigger floods can and will occur. This statement holds true whether you are talking about a 1 a-year, lOa-year or SOO-year floods The Fourmile Canyon Creek floodplain has not had a significant flood in I ES-3 I I