Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 04Mar2018 8 a.m. 48.90 14.30 63.88 5.20 04Mar2018 9 a.m. 49.19 15.50 63.19 54.60 04Mar2018 10 a.m. 49.82 15.30 61.75 98.40 04Mar2018 11 a.m. 50.59 16.30 60.41 157.20 04Mar2018 12 p.m. 50.92 13.50 61.14 98.50 04Mar2018 1 p.m. 50.61 12.90 64.25 125.80 04Mar2018 2 p.m. 50.97 12.80 65.49 104.90 04Mar2018 3 p.m. 51.78 11.40 66.53 78.60 04Mar2018 4 p.m. 52.52 11.00 67.31 72.70 04Mar2018 5 p.m. 53.04 12.70 68.17 39.30 04Mar2018 6 p.m. 53.01 10.70 69.36 2.30 04Mar2018 7 p.m. 56.01 9.70 22.60 0.50 04Mar2018 8 p.m. 52.68 13.10 72.85 0.00 04Mar2018 9 p.m. 51.24 15.20 81.30 0.00 04Mar2018 10 p.m. 50.81 14.50 80.79 0.00 04Mar2018 11 p.m. 50.63 15.90 80.22 0.00 05Mar2018 12 a.m. 50.67 15.30 79.76 0.00 05Mar2018 1 a.m. 50.16 12.90 82.11 0.00 05Mar2018 2 a.m. 50.22 12.20 82.60 0.00 05Mar2018 3 a.m. 50.38 12.20 83.20 0.00 05Mar2018 4 a.m. 50.23 7.10 86.16 0.00 05Mar2018 5 a.m. 51.64 9.40 87.38 0.00 05Mar2018 6 a.m. 53.15 7.80 88.65 0.00 05Mar2018 7 a.m. 52.47 5.40 93.52 0.00 Accuml. Values 1231.64 297.10 1732.62 838.00 Num. Valid Values 24 24 24 24 Avg. Values 51.32 12.38 72.19 34.92 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 10.73 478.03 72.19 72.05 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2781 definition: xcompl = 1 - (RELH_avg/100) TdC = 5.9791 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 = 0.5658 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4342 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.2857 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 = 3.5624 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.5249 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.088 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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