Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 5.47 16.20 70.65 0.00 31Dec2017 9 a.m. 5.67 17.90 68.76 67.60 31Dec2017 10 a.m. 5.59 17.60 68.67 191.50 31Dec2017 11 a.m. 6.17 17.70 69.93 410.70 31Dec2017 12 p.m. 6.82 16.20 66.41 527.10 31Dec2017 1 p.m. 8.29 17.30 61.64 489.90 31Dec2017 2 p.m. 9.54 16.60 58.06 519.60 31Dec2017 3 p.m. 10.20 16.60 55.41 407.00 31Dec2017 4 p.m. 10.40 17.10 54.33 250.20 31Dec2017 5 p.m. 9.82 15.60 54.80 66.90 31Dec2017 6 p.m. 8.40 13.20 57.21 0.00 31Dec2017 7 p.m. 10.13 4.70 39.90 0.00 31Dec2017 8 p.m. 5.40 15.00 67.70 0.00 31Dec2017 9 p.m. 4.14 13.90 71.64 0.00 31Dec2017 10 p.m. 2.80 12.30 74.13 0.00 31Dec2017 11 p.m. 1.49 12.30 74.72 0.00 01Jan2018 12 a.m. 0.46 11.80 77.23 0.00 01Jan2018 1 a.m. -0.47 11.80 78.92 0.00 01Jan2018 2 a.m. -1.32 12.30 80.40 0.00 01Jan2018 3 a.m. -2.20 10.40 80.68 0.00 01Jan2018 4 a.m. -2.94 10.50 80.45 0.00 01Jan2018 5 a.m. -3.59 13.00 81.48 0.00 01Jan2018 6 a.m. -4.27 12.50 81.36 0.00 01Jan2018 7 a.m. -5.08 13.10 76.59 0.00 Accuml. Values 90.93 335.60 1651.07 2930.50 Num. Valid Values 24 24 24 24 Avg. Values 3.79 13.98 68.79 122.10 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -15.67 539.98 68.79 251.96 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3121 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.0707 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 = 0.1864 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8136 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9552 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 = 0.5654 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2023 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.046 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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