Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 31.32 20.60 51.10 0.00 05Dec2017 9 a.m. 31.51 21.00 49.10 61.40 05Dec2017 10 a.m. 33.17 24.00 45.69 334.40 05Dec2017 11 a.m. 36.70 26.40 41.87 501.20 05Dec2017 12 p.m. 39.72 24.00 36.19 573.60 05Dec2017 1 p.m. 42.60 22.70 31.86 573.20 05Dec2017 2 p.m. 44.82 22.50 29.17 511.80 05Dec2017 3 p.m. 46.20 23.70 28.02 392.60 05Dec2017 4 p.m. 47.10 22.20 28.10 229.30 05Dec2017 5 p.m. 47.62 19.80 30.72 46.50 05Dec2017 6 p.m. 46.13 13.40 35.47 0.00 05Dec2017 7 p.m. 42.93 12.80 49.85 0.00 05Dec2017 8 p.m. 41.11 11.90 40.51 0.00 05Dec2017 9 p.m. 39.70 15.80 41.19 0.00 05Dec2017 10 p.m. 38.73 16.20 46.26 0.00 05Dec2017 11 p.m. 38.86 15.00 47.92 0.00 06Dec2017 12 a.m. 39.61 15.30 48.89 0.00 06Dec2017 1 a.m. 39.90 13.60 47.23 0.00 06Dec2017 2 a.m. 40.96 20.40 46.49 0.00 06Dec2017 3 a.m. 40.69 21.90 45.44 0.00 06Dec2017 4 a.m. 39.69 20.20 47.86 0.00 06Dec2017 5 a.m. 38.91 17.70 50.66 0.00 06Dec2017 6 a.m. 38.50 14.10 54.96 0.00 06Dec2017 7 a.m. 37.63 11.50 58.83 0.00 Accuml. Values 964.13 446.70 1033.38 3224.00 Num. Valid Values 24 24 24 24 Avg. Values 40.17 18.61 43.06 134.33 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 4.54 718.74 43.06 277.20 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5694 definition: xcompl = 1 - (RELH_avg/100) TdC = -7.0424 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 = 0.4735 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5265 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.7466 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 = 4.8661 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 10.0789 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.241 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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