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<br />0:15[;7 <br /> <br />. <br /> <br />IV. The probable Environmental Impact 0 f Coll8tructinR. Operatil1ll <br /> <br />and MaintaininR the Prolect. <br />A. Environmental Effects. <br />1. Flood Security. With the completion of Trinidad Dam. <br />spring and summer floodflows originating above the site will be <br />detained within the confines of the reservoir. All floods equal to <br /> <br />or less than stsndard project flood magnitude will be regulated to <br /> <br />14,500 c.f.a. or less below the damsite. With the exception of large <br />magnitude floods, floodwaters will be regulated to limit flows down- <br />stream from the dam to the currently estimated nondamaging channel <br />capacity of 5,000 c.f.s. <br />A high degree of flood protection will be provided for residential, <br />business, industrial, and public properties; agricultural lands, <br /> <br />improvementS, distribution systems and products; wildlife and wild- <br /> <br />life habitat; transportation facilities; and utilities in potentially <br />endangered or affected reaches of the purgatoire River flood plain <br /> <br />and adjacent lands downstream from the dam (extending to the mouth <br /> <br />of San Francisco Creek). Since the value of property in the valley <br /> <br />subject to damage from the standard project flood (125,000 c.f.s.) <br />is estimated to be $53,325,000 (1973 prices), there will be appreciable <br />benefit to the entire community. Average annual benefits that are <br />expected to accrue from flood control are $1,084,000 (July 1973 <br />prices). Business and financial losses, as well as emergency <br /> <br />expenditures incurred as a consequence of flooding, will also be <br /> <br />prevented. <br /> <br />. <br /> <br />IV-l <br />