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;/ " Ct 297G . . NA,(IiOWS UNIT SOUTH PLATTE: DISTRICT MISSOURI BASIN PROv~CT Questions and answers reviewed at meetinE held in liegion 7 office March 3, 1949. The following is given as a resume of the questions and discussion given in the meeting referred to above. SECTIOH DiIE FLOOD CONTROL 1. Question: Among the purposes for which the N~rrows Heservoir is to be constructed is one concerning flood control. We would like to be advised whet studies have been me.de concerning the necessity of flood control on the South Platte liiver at the particular point designated and w;,etiler or not it is the firm opinion of the Bureau of Reclamation that such flood control is necessary. In considering this matter is the Bureau taking into consideration the possibility of the Blue-South Platte Transmountain Diversion and any othor additional water resources that might be developed on the Eastern Slope and in the basin of the South Platte River? If such studies do include these proposed constructions, what QIDOunt of water is GO included and when does it a?pear necessary to have the dam constructed? An~{er: The Corps of Engineers made a study of flood possi- bilities on-Ble South Platte Rivor ~nd in one of th8ir review re~orts chose the Narrows site as being the most logical site to use in con- trolling floods for protection of lower roaches of tl;e datte River. Studies made by the Corps of Engineers and reported in House Document 669 of the 80th Congress indicated that flood control was desirable, and the Bureau of Reclamation concurs in their findin~5. Flood studies are not affected by possible increased transmountain diversions, but in making water studies for irrigation of the Narrows Unit, possible construction of the Blue-South Platte Project was considered. Antici- pated return flows from that project were considered as a water resource. Studies indicate that the average increased flow at Kersey du~ to return flows from the potential Blue-South Platte Project will be a~proximately 99,000 acre-feet per year. Narrows Reservoir would b~ used prior to construction of tlle Blue-South Platte Project 'to capture and regulate wa.ter which cn.nnot be stored in the present irrigation systems, eitlwr through lack of capacity or innbility to operate canals to off-stroam reservoirs under icing condi~ions und to cnpture und conserve new Colorado-Big T~ompson Project return flows which because of the time of occurrence cannot be ndcquataly conserved in existing reservoirs or used for direct diversions by existing canals. 1