Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 03Mar2018 8 a.m. 42.96 12.40 65.93 71.70 03Mar2018 9 a.m. 44.78 15.40 63.70 288.90 03Mar2018 10 a.m. 48.13 15.30 56.97 489.10 03Mar2018 11 a.m. 50.61 10.10 57.13 652.70 03Mar2018 12 p.m. 52.66 13.80 53.12 762.30 03Mar2018 1 p.m. 55.74 14.40 49.74 812.60 03Mar2018 2 p.m. 59.07 15.50 45.20 787.60 03Mar2018 3 p.m. 61.92 14.00 41.72 688.50 03Mar2018 4 p.m. 63.07 14.70 40.81 533.10 03Mar2018 5 p.m. 63.70 13.80 40.43 335.40 03Mar2018 6 p.m. 63.14 9.50 40.99 101.40 03Mar2018 7 p.m. 53.01 10.50 69.74 0.00 03Mar2018 8 p.m. 58.48 8.40 45.09 0.00 03Mar2018 9 p.m. 56.26 9.10 45.22 0.00 03Mar2018 10 p.m. 54.36 8.70 48.33 0.00 03Mar2018 11 p.m. 51.64 6.00 54.52 0.00 04Mar2018 12 a.m. 51.12 6.90 55.55 0.00 04Mar2018 1 a.m. 51.40 9.50 55.54 0.00 04Mar2018 2 a.m. 51.37 11.70 53.66 0.00 04Mar2018 3 a.m. 51.19 11.60 53.20 0.00 04Mar2018 4 a.m. 50.49 13.50 56.80 0.00 04Mar2018 5 a.m. 49.86 11.90 60.02 0.00 04Mar2018 6 a.m. 49.41 13.40 61.75 0.00 04Mar2018 7 a.m. 48.85 13.30 64.51 0.00 Accuml. Values 1283.20 283.40 1279.67 5523.30 Num. Valid Values 24 24 24 24 Avg. Values 53.47 11.81 53.32 230.14 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 11.93 455.99 53.32 474.89 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4668 definition: xcompl = 1 - (RELH_avg/100) TdC = 2.7448 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 = 0.5827 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4173 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.6674 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 = 6.5255 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 9.0782 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.256 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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