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<br />17 <br /> <br />" <br /> <br />- <br /> <br />A considerable amount of detailed study including field surveys would be <br />required to obtain a more accurate or firm estimate of all the factors <br />influencing the total amount of water and the number of acre-feet per acre <br />available at the farm headgate. <br /> <br />Estimated canal losses <br /> <br />Table 5 shows the estimated average annual amount of canal losses com- <br />puted by the Bureau of Reclamation for the IS-year period. These estimates <br />were made monthly based upon number of days water was carried by each ditch, <br />not merely a constant percentage of the amount carried. <br /> <br />Table S. Estimated Average Annual Ditch Losses <br />from Water District 2 Canal Systems <br /> <br />Canal <br />Code No-,- <br /> <br />tl~ <br /> <br />Averaqe Annual Loss <br />(Acre-feet) <br /> <br />.. <br /> <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />IS <br />16 <br />17 <br /> <br />Prospect Valley <br />Lower Barr Lake <br />Fulton Ditch <br />Brantner Ditch <br />Brighton Di tch <br />Lupton Bottom Ditch <br />Platteville Ditch <br />Meadow Island Ditch No.1 <br />Evans No.2 Ditch <br />Gilmore Ditch <br />Meadow Island Ditch No.2 <br />Farmers Independent <br />Western Mutual Ditch <br />Union Ditch <br />Lower Latham Ditch <br />Patterson Di tch <br />Highland (Plumb) Ditch <br /> <br />3,200 <br />7,200 <br />7,900 <br />4,300 <br />2,500 <br />5,900 <br />4,800 <br />1,400 <br />6,800 <br />2,600 <br />2,900 <br />6,800 <br />5,700 <br />10,400 <br />9,700 <br />1,300 <br />---Ll00 <br /> <br />I ... <br /> <br />To ta 1 <br /> <br />84,700 <br /> <br />Estimated irriqation requirement at farm headqates <br />.~ <br />The irrigation water requirement at the farm headgate is that quantity <br />of water required for the direct irrigation of crops currently produced and <br />any future crops that could reasonably be anticipated. This includes suf- <br />ficient water for the consumptive use necessary for optimum crop production, <br />reasonable losses from farm distribution systems, tailwater runoff, deep <br />percolation below the root zone of the crop and reasonable soil leaching <br />requirements. Such requirements will vary year to year as influenced by <br />climatic conditions, and will also be dependent upon the type of crops, soil <br />and topographic conditions. <br /> <br />Crop consumptive use varies with climatic conditions,and stage of <br />plant growth. There are several accepted methods of determining consumptive <br />use with reasonable accuracy. The Bureau of Reclamation used a combination <br />of the Thornthwaite and the Lowry-Johnson methods to compute the consumptive <br />use of crops for the 17 canals for the IS-year period. <br />