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<br />. <br /> <br />. <br /> <br />. <br /> <br />\ <br /> <br />07"65 <br /> <br />49. ~rvoir storage capacities. - The total reservoir storage <br /> <br /> <br />capaci ty required for the Tri nidad Reservoir is 140,700 acre-feet. The <br /> <br /> <br />required allocation of this storagG, as discussed in preceding p~ra- <br /> <br /> <br />graphs, is 39,000 acre-feet for a 75-year sediment reserve, 55,000 acre- <br /> <br /> <br />feet conservation storage for irrigation, and 46,700 acre-feet for flood <br /> <br /> <br />control. The surface area at top of conservation pool (elevation 6,251.0) <br /> <br /> <br />and at top of flood control pool (elevation 6,275.5) would be 1,660 acres <br /> <br /> <br />and 2,120 acres, respectively. The area-capacity curves are sholVn on <br /> <br /> <br />plate 3, appc~",::r.;o <br /> <br /> <br />50. ~.~.cF'ired to empty flood control storag;;.. - In computing the <br /> <br /> <br />time required to empty the flood control storage of 46,700 acre-feet (ele- <br /> <br /> <br />vation 6,275..5) it was assumed that no further inflow entered the reser- <br /> <br /> <br />voir.. The maxilnum uncontrolled flow through the notCh-spillway at top of <br /> <br /> <br />the flood cGntrol pool is 15,000 cubic feet per second; therefore, the un- <br /> <br /> <br />controlled flow was passed through the spillway until the outflow reached <br /> <br /> <br />5,000 cubic feet per second. Thereafter, the flood-control storage release <br /> <br /> <br />was controlled to an outflow of 5,000 cubic feet per second as long as pos- <br /> <br /> <br />sible with the gated conduit. To empty the reservoir of the flood control <br /> <br /> <br />storage from elevation 6,275.5 down to elevation 6,251.0 (top of irriga- <br /> <br /> <br />tion pool) under these conditions wORld take approximately 4-1/4 days. <br /> <br /> <br />51. Effects of flood control operation. - The project is designed <br /> <br /> <br />wi th a gated or controlled outlet and an uncontrolled notched spillway. <br /> <br /> <br />The crest of the 40-foot notch in the spillway crest is at eleva- <br /> <br /> <br />tion 6,259.0 feet. At this elevation the storage capacity is 107,500 acre- <br /> <br /> <br />feet. The increment of flood-control storage between the top of conserva- <br /> <br /> <br />tion pool and the bottom of the notch amounts to 13,500 acre-feet. With <br /> <br /> <br />the Trinidad Reservoir in operation, all floods equal to or less than the <br /> <br /> <br />standard project flood would be regulated at the dam site to 15,000 cubic <br /> <br /> <br />feet per second or less. Reservoir outflows ~1Ould lag the flows from the <br /> <br />38 <br /> <br />APPENDIX B <br /> <br />. <br /> <br />