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Net Annual Economic Benefits 41 39 36 33 30 27 24 2 .. .,; N ~ .; ~ N ~ 9 GO b ~ '" ~ GO ~ 3 ~ ~ ~ ~ .,; ~ 0 - -------. '" ~ GO ~ .; ~ .. '" ~ ~ <! 2 3 4 5 6 7 8. 8& 9 10 II 12 13. 13& . " ~ Alternative E >!! SUMMARY OF NONMONETARY CRITERIA EVALUATION The impacts of nonmonetary criteria are defined in terms of a scale indicat- ing the relative positive or negative change from present conditions. Eco- nomic development associated with municipal water uses would tend to require relatively more local govern- ment and supportive services than for an equivalent amount of water used for agricultural purposes. Upstream and downstream mainstem storage, and storage on mountain trib- utaries (Alternatives 2, 3,8, 10 and 11) would provide varying degrees of flood control if they were constructed, Existing flood control benefits would be diminished if some storage at Chat- field, Bear Creek and Cherry Creek Reservoirs were to be utilized for water supply development (Alterna- tive 1) or in minimal development (Alternative 5), Water storage by surface water impoundments would tend to reduce the seasonal variability of dissolved solids concentrations in the released flows downstream, Concentrations of dissolved solids generally are smaller during high flow periods and larger during low flow periods. In-reservoir effects include increasing dissolved solids concentrations due to evapora. tive losses, deposition of inflowing sed- iment and eutrophication. including potential algal growth, In addition, a storage reservoir may reduce sea- sonal variability of, and cause substan- tial changes in, average downstream water temperatures, To the extent that increased water consumption may reduce downstream flows. some increased temperatures may be noted, due to decreased depths and reduced scour of deposited sediment. Fish and wildlife impacts are primarily site-specific. Construction of certain alternatives could create changes in the nature of the existing fisheries. These impacts are pronounced in mountain tributary or upper main- stem storage, Changes in these loca- tions from a riverine habitat to a lake habitat could result in losses of valua- ble species, Other impacts on fish and wildlife would be associated with increased water use and related water losses, These may result in altered seasonal patterns or reductions of 15