Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 63.68 17.10 91.43 0.00 04Dec2017 9 a.m. 63.39 19.80 93.51 37.10 04Dec2017 10 a.m. 65.32 15.80 90.48 75.70 04Dec2017 11 a.m. 68.49 18.80 80.78 168.40 04Dec2017 12 p.m. 70.02 25.20 69.73 174.90 04Dec2017 1 p.m. 68.67 26.40 63.67 183.00 04Dec2017 2 p.m. 62.74 29.30 61.89 239.50 04Dec2017 3 p.m. 57.97 27.70 53.98 203.70 04Dec2017 4 p.m. 59.25 24.40 50.20 206.90 04Dec2017 5 p.m. 58.01 34.70 46.59 43.80 04Dec2017 6 p.m. 52.72 31.50 52.74 0.00 04Dec2017 7 p.m. 42.03 9.50 33.98 0.00 04Dec2017 8 p.m. 46.56 33.60 52.39 0.00 04Dec2017 9 p.m. 43.79 31.80 55.23 0.00 04Dec2017 10 p.m. 41.27 34.00 59.60 0.00 04Dec2017 11 p.m. 38.44 28.50 61.72 0.00 05Dec2017 12 a.m. 35.82 27.80 60.83 0.00 05Dec2017 1 a.m. 34.02 26.30 53.52 0.00 05Dec2017 2 a.m. 32.43 22.70 55.39 0.00 05Dec2017 3 a.m. 31.62 20.60 55.62 0.00 05Dec2017 4 a.m. 31.10 18.90 55.33 0.00 05Dec2017 5 a.m. 31.39 17.50 53.74 0.00 05Dec2017 6 a.m. 31.73 15.50 50.52 0.00 05Dec2017 7 a.m. 31.23 17.90 52.67 0.00 Accuml. Values 1161.68 575.30 1455.54 1333.00 Num. Valid Values 24 24 24 24 Avg. Values 48.40 23.97 60.65 55.54 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 9.11 925.66 60.65 114.61 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3935 definition: xcompl = 1 - (RELH_avg/100) TdC = 1.9513 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 = 0.5423 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4577 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.1346 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 = 4.5463 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 11.7684 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.215 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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