Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 03Dec2017 8 a.m. 54.07 7.00 75.78 0.00 03Dec2017 9 a.m. 54.54 7.20 76.65 59.60 03Dec2017 10 a.m. 57.02 10.70 73.82 132.70 03Dec2017 11 a.m. 59.50 12.10 71.06 263.30 03Dec2017 12 p.m. 62.91 12.70 65.46 231.60 03Dec2017 1 p.m. 67.68 14.70 58.96 354.00 03Dec2017 2 p.m. 69.37 16.90 57.32 264.80 03Dec2017 3 p.m. 69.66 14.70 58.39 128.20 03Dec2017 4 p.m. 69.87 12.90 58.84 206.20 03Dec2017 5 p.m. 68.94 12.40 59.79 63.40 03Dec2017 6 p.m. 65.70 10.20 64.00 0.00 03Dec2017 7 p.m. 63.81 11.30 62.40 0.00 03Dec2017 8 p.m. 61.16 6.20 70.77 0.00 03Dec2017 9 p.m. 59.54 5.00 74.73 0.00 03Dec2017 10 p.m. 58.98 6.50 76.30 0.00 03Dec2017 11 p.m. 58.87 6.50 76.17 0.00 04Dec2017 12 a.m. 57.56 6.30 78.25 0.00 04Dec2017 1 a.m. 56.89 5.10 78.78 0.00 04Dec2017 2 a.m. 57.78 6.30 73.81 0.00 04Dec2017 3 a.m. 57.74 7.40 74.67 0.00 04Dec2017 4 a.m. 56.62 6.00 79.22 0.00 04Dec2017 5 a.m. 59.14 10.50 79.81 0.00 04Dec2017 6 a.m. 61.14 12.90 80.34 0.00 04Dec2017 7 a.m. 61.86 13.70 83.39 0.00 Accuml. Values 1470.34 235.20 1708.71 1703.80 Num. Valid Values 24 24 24 24 Avg. Values 61.26 9.80 71.20 70.99 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 16.26 378.44 71.20 146.49 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2880 definition: xcompl = 1 - (RELH_avg/100) TdC = 11.1064 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 = 0.6410 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3590 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.6713 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 = 5.2636 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 6.5441 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.109 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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