Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 36.01 7.50 53.81 0.00 05Dec2017 9 a.m. 35.53 9.60 50.90 32.10 05Dec2017 10 a.m. 35.37 7.30 46.32 86.30 05Dec2017 11 a.m. 35.62 7.80 44.65 82.20 05Dec2017 12 p.m. 36.27 7.20 43.79 118.00 05Dec2017 1 p.m. 37.96 7.00 40.03 249.40 05Dec2017 2 p.m. 39.24 6.10 36.27 286.30 05Dec2017 3 p.m. 40.19 5.80 34.85 202.60 05Dec2017 4 p.m. 40.75 6.60 33.83 161.80 05Dec2017 5 p.m. 40.39 5.00 35.77 32.70 05Dec2017 6 p.m. 38.68 2.00 39.51 0.00 05Dec2017 7 p.m. 42.57 0.90 50.24 0.00 05Dec2017 8 p.m. 29.73 1.50 64.32 0.00 05Dec2017 9 p.m. 28.38 2.10 67.12 0.00 05Dec2017 10 p.m. 28.65 1.40 68.32 0.00 05Dec2017 11 p.m. 28.04 2.00 72.28 0.00 06Dec2017 12 a.m. 27.41 1.20 72.57 0.00 06Dec2017 1 a.m. 27.18 1.50 75.05 0.00 06Dec2017 2 a.m. 26.19 1.80 79.51 0.00 06Dec2017 3 a.m. 25.84 1.70 82.38 0.00 06Dec2017 4 a.m. 25.21 1.20 83.05 0.00 06Dec2017 5 a.m. 25.93 2.90 85.57 0.00 06Dec2017 6 a.m. 26.13 2.20 86.99 0.00 06Dec2017 7 a.m. 25.00 1.30 89.34 0.00 Accuml. Values 782.26 93.60 1436.47 1251.40 Num. Valid Values 24 24 24 24 Avg. Values 32.59 3.90 59.85 52.14 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 0.33 150.60 59.85 107.60 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4015 definition: xcompl = 1 - (RELH_avg/100) TdC = -6.5404 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 = 0.4086 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5914 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.0798 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 = 2.5252 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9359 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.044 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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