Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 17.73 7.20 79.50 0.00 31Dec2017 9 a.m. 17.22 9.40 72.82 32.30 31Dec2017 10 a.m. 17.49 7.20 69.94 109.10 31Dec2017 11 a.m. 18.21 7.70 62.30 361.60 31Dec2017 12 p.m. 20.32 8.00 52.59 575.00 31Dec2017 1 p.m. 21.43 8.70 45.42 615.80 31Dec2017 2 p.m. 22.69 7.60 39.01 584.00 31Dec2017 3 p.m. 23.02 8.10 34.45 474.20 31Dec2017 4 p.m. 22.89 7.70 33.31 282.30 31Dec2017 5 p.m. 21.97 7.40 34.55 94.50 31Dec2017 6 p.m. 19.42 7.60 38.36 0.00 31Dec2017 7 p.m. 17.08 7.70 51.83 0.00 31Dec2017 8 p.m. 16.68 5.00 44.93 0.00 31Dec2017 9 p.m. 15.64 5.10 47.22 0.00 31Dec2017 10 p.m. 14.76 5.10 49.61 0.00 31Dec2017 11 p.m. 13.60 4.90 50.95 0.00 01Jan2018 12 a.m. 12.65 4.30 52.37 0.00 01Jan2018 1 a.m. 11.89 4.50 54.79 0.00 01Jan2018 2 a.m. 11.12 4.50 55.93 0.00 01Jan2018 3 a.m. 10.53 5.90 58.39 0.00 01Jan2018 4 a.m. 9.64 5.80 59.86 0.00 01Jan2018 5 a.m. 8.69 5.90 61.03 0.00 01Jan2018 6 a.m. 8.04 5.00 62.69 0.00 01Jan2018 7 a.m. 7.30 5.10 64.49 0.00 Accuml. Values 380.03 155.40 1276.34 3128.80 Num. Valid Values 24 24 24 24 Avg. Values 15.83 6.47 53.18 130.37 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.98 250.04 53.18 269.01 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4682 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.7997 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 = 0.2708 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7292 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.2235 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 = 1.4676 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.6049 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.059 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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