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-:} ..~ ) -.J W i'o-~ SUMMARY The Flood Control Work Group finds that flood problems exist in the Upper Colorado Region and that substantial flood damage can be expected in the future unless adequate flood damage reduction programs are implemented. It is estimated that the total average annual flood damage in 1965 was $2.8 million, and in the absence of additional damage reduction measures the flood damage will increase to $4.2 million by 1980, $6.8 million by 2000, and $10.6 million by 2020. The future flood damage reduction program consists of non-structural flood plain management measures, utilization of proposed multiple-purpose reservoirs for flood control storage, and construction of other structural flood control works where required. Flood control storage in future multiple-purpose reservoirs and small flood retarding structures would amount to 2,300,000 acre-feet. Other structural measures would include construction of 9 miles of levees and improvement in the flow capacities of 11 miles of channels. Non-structural measures would include improved flood forecasting, dissemination of flood hazard information, flood plain zoning, and other measures by local authorities. Flood damages would also be reduced by land treatment on 7,112,000 acres under watershed management programs. It is estimated the program presented would reduce the projected average annual flood damage to $3.3 million by 1980, $3.4 million by 2000, and $3.8 million by 2020. The damage projections are based on a modification of the OBERS baseline projections referred to as the Regional Interpretation of OBERS (RI-OBERS). OBERS baseline projections, three'State Alternative development levels, and their effect on the flood control program are discussed in Supplement A. The incremental installation costs of the program are estimsted at $14.8 million, $29.9 million, and $15.1 million in the 1966-1980, 1981-2000, and 2001-2020 time frames, respectively. Except for the small detention type reservoirs and levee and channel improvements, these costs do not include the portion of total costs of watershed land treatment and water control facilities related to flood control in water- shed projects. Such costs are included in the overall watershed program costs in Appendix VIII - Watershed Management. The future flood control plan contained in this appendix is a preliminary or reconnaissance level plan which indicates the seriousness of the flood problem and furnishes possible solutions to these problems. These problems and solutions should be studied in detail followed by timely implementation of appropriate flood damage reduction measures. i