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<br />19 <br /> <br />.' <br /> <br />The irrigation efficiency would likely be much less than 60 percent <br />where the soil texture ranges from sandy loan to loamy sand. Such soil s <br />have low water holding capacity, hi9h infiltration rates, and require <br />frequent irrigations. Under these conditions a large part of the irri- <br />gation water is lost by deep percolation below the root zone of the crop. <br />The Platteville, Evans No.2, Farmers Independent, Western Mutual, and <br />Lower Latham Ditches likely have an irrigation efficiency of only 30 to <br />50 percent. Much of the land with the sandier types of soil is used for <br />the production of potatoes. Although the consumptive use of water by po- <br />tatoes is relatively low, the irrigation water requirements are large. The <br />irrigation efficiency for potatoes is lower than that for any other crop <br />under sandy soil conditions. <br /> <br />Table 7. shows the estimated irrigation requirmncnts .t the farm head- <br />gate as computed by the [Jureau of Re1amation for the 15-year period of ' <br />1947 to 1961. <br /> <br /> Table 7. Estimated Irrigation Requirement at Farm Headga te <br /> Farm Hcadqate Hequirements <br />" <br /> (100 Acre-Feet) (Acre-Feet per Acre) <br /> Canal Range Range <br />, Code No. Max. Min. Ave. 9 of 15 yrs. Max. Min. Ave. 9 of 15 yrs. <br /> 1 460 289 363 309 to 411 3.08 1.93 2.43 2.11 to 2.96 <br /> 2 847 427 661 558 to 720 3.13 1.58 2.44 2.2~ to 2.76 <br /> 3 375 186 293 262 to 330 2.93 1.~8 2.29 2.05 to 2.58 <br /> 4 137 70 108 98 to 121 3.12 1.60 2.4~ 2.12 to 2.76 <br /> 5 67 34 53 46 to 59 3.06 1.55 2.42 2.10 to 2.'/0 <br /> 6 146 7~ 114 101 to 127 3.15 1.59 2.45 2.18 to 2.74 <br /> 7 50 25 38 34 to 43 3.17 1.58 2.44 2.15 to 2.72 <br /> 8 66 32 51 45 to 55 3.18 1.54 2.~4 2.17 lo 2.65 <br /> 9 624 310 488 433 to 542 3.12 1.57 2.44 2.17 to 2.71 <br /> 10 75 38 '59 53 to 65 3.12 1.58 2.44 2.20 to 2.66 <br /> 11 100 52 79 62 to 88 3.11 1.62 2.45 2.14 to 2.73 <br /> 12 193 96 151 135 to 170 3.12 1.55 2.44 2.18 to 2.74 <br /> 13 158 79 123 109 to 136 3.14 1.57 2.44 2.17 to 2.70 <br /> 14 163 83 128 113 to 143 3.11 1.58 2.44 2.15 to 2.73 <br /> 15 334 168 260 230 to 280 3.13 1.58 2.44 2.17 to 2.71 <br /> 16 23 11 17 15 to 20 3.25 1.55 2.45 2.12 to 2.5~ <br /> 17 71 35 -2Q- 51 to 63 ....;hl~ 1.53 2.~4 2.23 to 2.71 <br /> Total 3,042 Averages 3.19 1.59 2.43 <br />'. <br /> <br />.' <br />