Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 47.59 5.10 55.14 9.80 02Dec2017 9 a.m. 49.55 6.90 53.06 145.20 02Dec2017 10 a.m. 52.74 11.50 48.02 323.10 02Dec2017 11 a.m. 56.79 9.40 45.84 453.10 02Dec2017 12 p.m. 60.24 8.70 49.34 536.20 02Dec2017 1 p.m. 61.07 9.20 47.64 546.80 02Dec2017 2 p.m. 63.45 6.50 44.67 490.50 02Dec2017 3 p.m. 65.53 5.40 43.70 370.90 02Dec2017 4 p.m. 67.84 2.90 43.21 206.90 02Dec2017 5 p.m. 65.97 2.30 48.31 26.10 02Dec2017 6 p.m. 62.02 0.30 55.45 0.00 02Dec2017 7 p.m. 63.75 10.80 65.49 0.00 02Dec2017 8 p.m. 55.56 0.20 67.28 0.00 02Dec2017 9 p.m. 57.92 2.80 60.28 0.00 02Dec2017 10 p.m. 57.02 2.30 60.69 0.00 02Dec2017 11 p.m. 56.03 3.00 62.19 0.00 03Dec2017 12 a.m. 54.28 2.30 65.78 0.00 03Dec2017 1 a.m. 52.59 3.00 72.20 0.00 03Dec2017 2 a.m. 52.88 3.10 71.92 0.00 03Dec2017 3 a.m. 52.25 2.80 76.00 0.00 03Dec2017 4 a.m. 51.96 3.10 78.25 0.00 03Dec2017 5 a.m. 52.27 3.90 77.58 0.00 03Dec2017 6 a.m. 52.05 4.10 78.69 0.00 03Dec2017 7 a.m. 53.42 5.30 76.00 0.00 Accuml. Values 1364.77 114.90 1446.73 3108.60 Num. Valid Values 24 24 24 24 Avg. Values 56.87 4.79 60.28 129.52 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.81 184.87 60.28 267.28 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3972 definition: xcompl = 1 - (RELH_avg/100) TdC = 6.3122 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 = 0.6087 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3913 definition: del_lambda2 = 1 - del_lambda1 Qn = 2.0592 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 = 6.2436 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 4.7919 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.123 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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