Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 34.00 9.90 77.56 0.00 30Dec2017 9 a.m. 31.41 10.60 83.26 0.00 30Dec2017 10 a.m. 29.64 10.40 90.33 9.80 30Dec2017 11 a.m. 28.92 9.60 92.73 35.80 30Dec2017 12 p.m. 29.05 9.10 88.32 61.70 30Dec2017 1 p.m. 28.83 10.50 82.32 103.30 30Dec2017 2 p.m. 28.60 9.20 77.72 130.20 30Dec2017 3 p.m. 27.73 9.90 80.43 83.90 30Dec2017 4 p.m. 26.65 9.40 80.46 35.50 30Dec2017 5 p.m. 26.17 7.80 78.22 2.40 30Dec2017 6 p.m. 25.83 6.80 75.23 0.00 30Dec2017 7 p.m. 17.98 5.90 41.41 0.00 30Dec2017 8 p.m. 25.25 3.80 72.72 0.00 30Dec2017 9 p.m. 25.30 2.10 72.39 0.00 30Dec2017 10 p.m. 25.43 1.30 73.20 0.00 30Dec2017 11 p.m. 25.97 2.80 74.41 0.00 31Dec2017 12 a.m. 26.11 3.70 76.26 0.00 31Dec2017 1 a.m. 25.86 4.80 78.44 0.00 31Dec2017 2 a.m. 25.45 5.30 81.88 0.00 31Dec2017 3 a.m. 24.78 3.80 85.34 0.00 31Dec2017 4 a.m. 24.87 8.20 79.76 0.00 31Dec2017 5 a.m. 21.58 11.20 73.81 0.00 31Dec2017 6 a.m. 19.09 7.40 92.05 0.00 31Dec2017 7 a.m. 18.34 7.10 88.26 0.00 Accuml. Values 622.85 170.60 1896.51 462.60 Num. Valid Values 24 24 24 24 Avg. Values 25.95 7.11 79.02 19.27 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -3.36 274.50 79.02 39.77 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2098 definition: xcompl = 1 - (RELH_avg/100) TdC = -6.4723 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 = 0.3522 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6478 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.6994 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 = 1.0084 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2251 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.022 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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