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<br />104G <br />COMPANY-OWNED WELLS <br /> <br />Measurements made during February 18-20, 1970, show that the maximum <br />combined yield of the seven company-owned wells is 8.6 cfs and provided the <br />data for development of a rating curve for the measuring weir at the well water <br />discharge into the ditch. Individual yields and specific conductances (a dis- <br />cussion of specific conductance and other water quality considerations can be <br />found in the section of this report entitled "Ground Water Quality") are tabula- <br />ted below. <br /> <br /> Specific <br />Well No. Location Yield (gpm) Yield (cfs) Conduc tance ( mho/ em) <br />1 South fie ld 440 0.98 1550 <br />2 Sou th field 270 0.60 1400 <br />3 South fie ld 420 0.94 1650 <br />4 North field 920 2.05 <br />5 North field 310 0.69 <br />6 North fie ld 870 1.94 <br />7 North field 640 1.43 <br />Totals 3870 8.63 <br /> <br />In order to make the yield measurements an 8' x 8' x 2' rectangular, water-tight <br />flume was constructed with 5/8" plywood in the ditch bottom, just below the lo- <br />cation of well water discharge into the ditch. Wells 1, 2 and 3 were measured <br />individually with a 6" Parshall flume at the downstream end of the plywood flume <br />using a water-tight contraction also made of plywood. Submergence was not a <br />problem. Deterioration of the contraction made measurements of the yields of <br />the remaining wells with the Parshall flume impossible, and they were measured <br />with a Pygmy current meter in the rectangular flume. In order to keep the flow- <br />rate large and the errors small, the yields were measured in combinations which <br />allowed the calculation of each. Specific conductance was measured with a Beck- <br />man RB3 Solu bridge. <br /> <br />Prolonged pumping and interference between wells results in a lower <br />yield. Records from the recording gage at the measuring weir installed in July, <br />1968, show that the average yield is between 6 and 7 cfs, but to be conserative <br />6 cfs is considered average in this study. Using this average yield and a record <br />of the days the wells were pumped each month during the 13-year period 1958-l970, <br />Table 2 has been prepared. This table presents monthly irrigation season total <br />and average pumpage by the company-owned wells. <br /> <br />A comparison of company-owned well pumpage from Table 2 and headgate <br />diversions from Table 1 during irrigation seasons 1958-70 confirms the ex- <br />pected relationship between the two. Headgate diversions during irrigation sea- <br />son 1970 were the largest of the l3-year period; consequently pumpage was the <br />smallest. During irrigation season 1963, the pumpage was the largest of the 13- <br />years and headgate diversions were smallest. In general, periods when headgate <br />diversions are larger than average are periods when pumpage from company-owned <br />~el1s is smaller than average, and vice versa. <br /> <br />The l3-year average and 1968, 1969 and 1970 irrigation season company- <br />owned well pumpages,are 970, 1360, 560 and 240 ac-ft, respectively. This indicates <br /> <br />- 6 - <br />