Detailed Weather Data for Project: WDMA

Date Time TAIR WSPD RELH SRAD 03Dec2017 8 a.m. 55.51 1.90 74.44 4.90 03Dec2017 9 a.m. 56.66 1.80 73.73 47.80 03Dec2017 10 a.m. 59.56 2.50 70.06 154.20 03Dec2017 11 a.m. 62.78 2.80 64.96 178.60 03Dec2017 12 p.m. 67.10 3.00 60.21 348.40 03Dec2017 1 p.m. 72.64 6.10 54.88 234.90 03Dec2017 2 p.m. 73.89 7.80 52.96 377.30 03Dec2017 3 p.m. 73.92 7.20 52.91 221.20 03Dec2017 4 p.m. 73.76 6.70 51.80 107.10 03Dec2017 5 p.m. 72.99 6.10 52.59 48.10 03Dec2017 6 p.m. 69.22 4.50 58.02 0.00 03Dec2017 7 p.m. 68.97 4.40 81.07 0.00 03Dec2017 8 p.m. 63.48 3.40 70.03 0.00 03Dec2017 9 p.m. 63.12 1.50 70.05 0.00 03Dec2017 10 p.m. 60.73 1.30 73.51 0.00 03Dec2017 11 p.m. 59.40 1.80 75.72 0.00 04Dec2017 12 a.m. 61.59 2.20 69.86 0.00 04Dec2017 1 a.m. 61.52 3.20 68.46 0.00 04Dec2017 2 a.m. 58.59 1.70 76.04 0.00 04Dec2017 3 a.m. 61.11 3.10 72.56 0.00 04Dec2017 4 a.m. 64.47 4.80 69.27 0.00 04Dec2017 5 a.m. 63.81 4.50 72.89 0.00 04Dec2017 6 a.m. 63.61 3.20 75.05 0.00 04Dec2017 7 a.m. 64.17 7.50 76.59 0.00 Accuml. Values 1552.58 93.00 1617.66 1722.50 Num. Valid Values 24 24 24 24 Avg. Values 64.69 3.87 67.40 71.77 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 18.16 149.64 67.40 148.10 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3260 definition: xcompl = 1 - (RELH_avg/100) TdC = 12.1158 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 = 0.6648 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3352 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.7499 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 = 6.7149 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 4.5627 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.080 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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