Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 03Dec2017 8 a.m. 41.22 5.10 100.23 4.90 03Dec2017 9 a.m. 42.21 5.90 100.23 88.70 03Dec2017 10 a.m. 48.36 8.60 96.70 194.70 03Dec2017 11 a.m. 55.17 9.90 87.92 367.50 03Dec2017 12 p.m. 61.75 13.10 80.86 514.80 03Dec2017 1 p.m. 65.23 13.00 71.73 499.30 03Dec2017 2 p.m. 67.05 15.50 61.81 463.30 03Dec2017 3 p.m. 67.71 17.90 55.72 346.60 03Dec2017 4 p.m. 66.33 17.10 58.18 150.90 03Dec2017 5 p.m. 66.02 17.10 57.33 56.10 03Dec2017 6 p.m. 63.14 14.20 68.33 0.00 03Dec2017 7 p.m. 49.26 34.20 53.68 0.00 03Dec2017 8 p.m. 61.57 18.80 85.54 0.00 03Dec2017 9 p.m. 62.29 20.80 86.50 0.00 03Dec2017 10 p.m. 62.47 20.10 88.79 0.00 03Dec2017 11 p.m. 63.03 21.70 85.70 0.00 04Dec2017 12 a.m. 64.08 24.20 80.08 0.00 04Dec2017 1 a.m. 63.18 21.50 83.75 0.00 04Dec2017 2 a.m. 62.56 17.80 87.73 0.00 04Dec2017 3 a.m. 62.82 19.40 86.87 0.00 04Dec2017 4 a.m. 62.69 19.40 86.90 0.00 04Dec2017 5 a.m. 62.55 18.90 87.94 0.00 04Dec2017 6 a.m. 63.10 17.10 87.77 0.00 04Dec2017 7 a.m. 63.25 15.90 89.53 0.00 Accuml. Values 1447.03 407.20 1929.82 2686.80 Num. Valid Values 24 24 24 24 Avg. Values 60.29 16.97 80.41 111.95 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 15.72 655.18 80.41 231.01 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1959 definition: xcompl = 1 - (RELH_avg/100) TdC = 12.3831 definition: TdC = TAIR_avg - ((14.55 + (0.114*TAIR_avg))*xcompl +pow((2.5 + 0.007*TAIR_avg)*xcompl, 3) + (15.9 +0.117*TAIR_avg)*pow(xcompl, 14)) del_lambda1 = 0.6340 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3660 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.6952 definition: Qn = 0.00714*SRAD_avg + 0.00000526*SRAD_avg*pow(TAIR_avg+17.8, 1.87) +0.00000394*pow(SRAD_avg, 2) - 0.00000000239*pow(SRAD_avg, 2)*pow(TAIR_avg-7.2, 2) - 1.02 es_ea = 3.4737 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 6.9404 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.142 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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