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<br />. <br /> <br />. <br /> <br />. <br /> <br />OG3329 <br /> <br />CHAPTER :;::;:r <br /> <br />POTENTIAL IRRIGATION DEVELOPMENT <br /> <br />Irrigation Requirements <br /> <br />In estimating the average.amount and seasonable distribution of <br />irrigation diversion requirements of project lands, consideration vas <br />gi ven to the length of growing season, type of crops grovn, effective <br />precipitation, consumptive use of irrigation vater, probable farm <br />application efficiencies, lateral and main canal losses, and usable <br />return flova. <br /> <br />The quantity of irrigation vater consumed on irrigated lands in <br />the area vas estimated by use of the Blaney-Criddle method vhich <br />relates the consumptive use of irrigation vater for each type of crop <br />to temperature, :)recipi tation, and daytime hours. The climatological <br />data given on page 1 formed the basis for the studies. The average <br />1928 to 1954 precipitation vas estimated to be 80 percent effective. <br />The predominating crops were considered to be grass, hay, and pasture. <br /> <br />Unavoidable losses incident to the application of vater to the <br />land after delivery to the farm were estimated from somewhat meager <br />data concerning such losses on co~arable areas now being irrigated. <br />Cana:. and conveyance losses were estimated with consideration being <br />given to physical factors and records of losses in similar canals of <br />operating projects. Only a small percentage of the project land is <br />favorably located for the redi version of return flow. <br /> <br />The derivation of the average annual diversic.. requirement at <br />Perry Drav Reservoir site is shovn below. <br /> <br />Total consumptive use <br />Effective precipitation (estimated to be <br />80e:, of 1928-54 mean) <br />Consumptive use of irrigation vater <br />Farm losses (55-;' of farm delivery re'l.uirement) <br />Farm deli very requirement <br />Conveyance losses (30% of gross re'l.uirement) <br />Gross requirement at Perry Draw Reservoir <br />Redivertible return flow <br />Net diversion re'l.uirement at Perry Draw Reservoir <br /> <br />Acre-feet <br />per acre <br />1.50 <br /> <br />.66 <br />-:B4 <br />1.03 <br />1.87 <br />.80 <br />2.D7 <br />.08 <br />2.59 <br /> <br />The following tabulation shows the estimated net diversion <br />requirements for a f'ull irrigation supply for the 3,600 acres of nev <br />project lands. <br /> <br />2~ <br />