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<br />. <br /> <br />o <br />" <br />/'.:, <br />o <br /> <br />14 <br /> <br />to control the maximum floods of record and the design <br /> <br />flood were determined by routing the floods through the <br /> <br />reservoir, starting with a full conservation pool, with <br /> <br />. regulation to control the flow at Trinidad to 5,000 cfs <br /> <br />whenever possible. <br /> <br />The spillway design flood is estimated to have a peak <br />discharge of 238,000 cfs and a volume of 166,800 acre feet. <br />The reduction of flood flows to such rates as will <br /> <br />prevent or minimize flood damages will prevent overflow and <br /> <br />resultant losses from flooded areas. <br /> <br />Such reduction in <br /> <br />peak flows also will increase the duration of high flows <br /> <br /> <br />and thus furnish opportunity for additional diversions by <br /> <br /> <br />downstream water users. Studies of the effect of operation <br /> <br /> <br />for flood control on the water supply of John Martin Reservoir <br /> <br />for the period 1925-1949 were prepared by the Corps of <br /> <br />Engineers with the fomlowing results: <br />Average Annual Quantities <br />(Acre Feet) <br /> <br />Saving from prevention of losses <br />from overflow 195 <br />Spills from John Martin Reservoir 140 <br />Net savings in water supply <br />Increased irrigation diversion <br />opportunity 395 <br />Return flow from increased irrigation 150 <br />Possible increased irrigation <br />consumptive use <br />Possible net depletion to John <br />Martin Reservoir <br /> <br />55 <br /> <br />245 <br />190 <br />