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<br />ALTERNATIVE 9
<br />COMBINED DOWNSTREAM
<br />MAINSTEM AND
<br />EXPANSION STORAGE
<br />
<br />Under this alternative, downstream
<br />South Platte River storage (Alterna-
<br />tive 8) would be combined with expan-
<br />sion of existing facilities (Alternative
<br />4}, The combination of Alternative 4
<br />and 8 would result in water deliveries
<br />of 120,900 acre-feet.
<br />
<br />The market-valued outputs of this
<br />alternative would be irrigation water,
<br />municipal and industrial water supply,
<br />hydroelectric power and flood protec-
<br />tion. Net annual economic benefits
<br />are estimated to be $5,9 million, This
<br />amounts to a 1.9 percent rate of return
<br />on the required investment of over
<br />$317 million,
<br />
<br />Nonmonetary impacts would be sim-
<br />ilar to those described under Alterna-
<br />tives 4 and 8.
<br />
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<br />ALTERNATIVE 10
<br />COMBINED TRIBVT ARY AND
<br />DOWNSTREAM MAINSTEM
<br />STORAGE
<br />
<br />This alternative considers develop.
<br />ment of mountain tributaries within
<br />the Cache la Poudre River and St.
<br />Vrain Creek sub-basins (Alternative
<br />3) combined with downstream main-
<br />stem development on the South Platte
<br />River (Alternative 8), Based upon the
<br />availability of undeveloped stream-
<br />flows on mountain tributary streams,
<br />and on the main stem South Platte
<br />River. storage reservoirs could be
<br />implemented concurrently_ This alter.
<br />native is estimated to deliver 133,300
<br />acre.feet per year in additional flows.
<br />
<br />Evaluation
<br />
<br />The market.valued outputs of this
<br />alternative would be irrigation water,
<br />municipal and industrial water supply,
<br />hydroelectric power and flood protec.
<br />tion. Net annual economic benefits
<br />are estimated to be $38.3 million, This
<br />amounts to a 8.6 percent rate of return
<br />on the estimated required investment
<br />of $443 million,
<br />10
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<br />
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<br />
<br />Employment changes, government
<br />and services would have impacts sim-
<br />ilar to those described for Alternatives
<br />3 and 8.
<br />
<br />existing flood control benefits on the
<br />South Platte River,
<br />
<br />A downstream mainstem reservoir
<br />combined with mountain tributary
<br />storage reservoirs would enhance
<br />
<br />The proposed mountain tributary
<br />reservoirs (Alternative 3) could have
<br />greater impacts on' fish and wildlife
<br />than the lower mainstem reservoir, All
<br />of these proposed reservoirs could
<br />provide new lake fisheries,
<br />
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