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Q '".-) ':-) c.c e...~ N REPORT OF THE FLOOD CONTROL WORK GROUP SUMMARY The Flood Control Work Group finds that flood problems exist in the Great Basin Region and that substantial flood damage can be expected in the ftl,ture unless adequate flood damage reduction programs are imple- mented.. Recurring floods in rapidly expanding urban areas, particularly along ;the Wasatch Range streams in Utah and those streams draining the eastetn slopes of the Sierra Nevada in Nevada, and in the expand agri- cultural areas will increase the threat to loss of life, human suffering, damage to property and loss of goods and services. The total average annual flood damage in 1965 was estimated to be $5.3 million, and in the absence of additional flood damage reduction measures will increase to $8.3 million by 1980, $14.4 million by 2000 and $24.3 . million by 2020. Est1ma.tes of future conditions are based on the Department of Commerce, Office of Business Economics' projections of population, personal income and employment, and the Departlllent of Agriculture Economic and Research Servic$' s projections of agricultural production, collectively referred to as OEE-ERS projections in the report. The. future flood damage reduction program consists of non-structural flood plain management measures, utilization of proposed. mul tiple-pur_ pose reservoirs for flood control storage, and construction of struc_ tural flood control works where required. Flood control storage in future 'multiple-purpose reservoirs and small flood retarding structures would l!JIlount to 1,344,000 acre_feet. other structural measures would include construction of 97 miles of levees and improvements in the flow capacities of 211 miles of channels. Non-structural mee-sures would in- clude improved flood forecasting, dissemination of flood hazard informa_ tion, and flood plain zoning and other measures by local authorities. Flood damages would also be reduced by land treatment on 723,100 acres under _tershed management programs. It is estimated the program presented would reduce the projected aver- age annual flood damage to $5.6 million by 1980, 36.3 million by 2000 and $7.8 million by 2020. The incremental installation costs of the program are estimated at $83.6 million, :1>,149.1 million and t54.2 million in the 1965_1980, 1980-2000 and 2000-2020 time frames, respectively. The future flood control plan contained in this appendix is a pre- liminary 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