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<br />-2().. <br /> <br /> <br />. <br /> <br />010'1. <br /> <br />and imprc~'8rr"nt p!'Ogl'''m~ This minimum pool would c.m0',.nt tG about 7,500 <br /> <br />acre-feet in John Martin Reservoir with a surface area of about IJ400 <br /> <br />acres. <br /> <br />Evaporatio~ feom the fish pool would be replaced from Granada Res- <br /> <br />orvoir by oxchangoo Operation studios for John Martin Reservoir as <br /> <br /> <br />propared by tho HYdrology and Sedimentaion Subcommittee for Colorado <br /> <br />4VIR were used to determine periods of fish pool evaperation ar~ evapo- <br /> <br />ration rateso Reservoir surface areas were taken from area-capacity <br /> <br />tablos supplied by the Corps of Engineers. <br /> <br />Average annual evaporation fx-om the permanent fish pool would <br /> <br />amount to on~y about 800 acre-feet vrith a maximum ef about 3,500 aere- <br /> <br />feet during water year 19404 The incremental evaporation for 7,500 <br /> <br />. <br /> <br />acre-feet of reservoir capacity would be greatest during years of lov! <br /> <br />reservoir capacities and insignificant during years of full reservoir. <br /> <br />it permanent fish pool would also be maintained in Granada Resor- <br /> <br />voir having a minimum dopth at the dam of about 8 feet, a capacity of <br /> <br />about 3,000 acre-foet, and a surface aroa of about 750 acr0S~ <br /> <br />Incroased Irrigation Use <br />With John Martin Reservoir in operation, irrigation shortages in <br /> <br />the service area would occur during extreme~ dry perieds such as 1931- <br />19400 Supplemental irrigation requirements for the existing acreago <br />would be negligiblo during wet pori ods such as 1921-1930 as shown by <br />the fellovdng tabulation: <br /> <br />. <br />