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<br />values. Maximum and mlmmum values of the <br />difference in evaporation arising from errors of .01 <br />inch were recorded. These values gave a range of <br />suppression estimates around the true value of .30. <br />The suppression range is plotted in Figure 20. <br /> <br />with the finding that correlation with lhe data <br />below .20 inch was very poor. <br /> <br />Because of this large expected error in <br />suppression on low evaporation days. the most <br />accurate supp/l:.T function can be developed from <br />data which excludes readings below .2 inch <br />evaporation. Therefore the regression lines used in <br />the report are based upon all the data gathered <br />except October 6/7 and the last nine days. <br /> <br />This range illustrates that the error in pan <br />measurement of .01 inch does not become <br />significanl to the suppression calculation until <br />evaporation values are below .25 inch. This agrees <br /> <br />1.00 <br /> <br />ae .80 <br />~ <br /> <br />0:: <br />0 <br />0:: .60 <br />0:: <br />w <br />I- <br />Z <br />w <br />::2!: .40 <br />w <br />0:: <br />:::> <br />CJ) <br /><t <br />W <br />::2!: .20 <br /> <br />o <br /> <br /> <br />o <br /> <br />.20 .30 <br />EVAPORATION <br /> <br />.40 <br /> <br />(inches) <br /> <br />.50 <br /> <br />.10 <br />DAILY. <br /> <br />Figure 19. Error In dally evaporadon pan m""".....menlll. <br /> <br />S4 <br />