Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 43.63 0.38 69.84 26.00 02Dec2017 9 a.m. 48.24 0.39 59.95 139.00 02Dec2017 10 a.m. 57.47 0.79 48.47 317.00 02Dec2017 11 a.m. 67.37 2.10 42.61 460.00 02Dec2017 12 p.m. 67.71 0.36 29.37 498.00 02Dec2017 1 p.m. 69.35 3.15 33.46 518.00 02Dec2017 2 p.m. 70.88 0.76 27.90 441.00 02Dec2017 3 p.m. 73.29 0.07 32.84 363.00 02Dec2017 4 p.m. 71.78 0.55 45.92 222.00 02Dec2017 5 p.m. 68.13 0.38 50.00 59.00 02Dec2017 6 p.m. 64.40 0.20 57.15 1.00 02Dec2017 7 p.m. 66.60 3.37 54.27 0.00 02Dec2017 8 p.m. 57.79 0.40 71.98 0.00 02Dec2017 9 p.m. 54.73 0.35 79.43 0.00 02Dec2017 10 p.m. 52.65 0.33 79.49 0.00 02Dec2017 11 p.m. 49.89 0.41 88.40 0.00 03Dec2017 12 a.m. 49.44 0.41 93.22 0.00 03Dec2017 1 a.m. 49.12 0.17 95.73 0.00 03Dec2017 2 a.m. 47.14 0.41 98.90 0.00 03Dec2017 3 a.m. 47.35 0.31 97.01 0.00 03Dec2017 4 a.m. 47.48 0.41 97.37 0.00 03Dec2017 5 a.m. 46.94 0.20 98.24 0.00 03Dec2017 6 a.m. 46.49 0.27 98.91 0.00 03Dec2017 7 a.m. 46.60 0.21 98.96 0.00 Accuml. Values 1364.47 16.38 1649.42 3044.00 Num. Valid Values 24 24 24 24 Avg. Values 56.85 0.68 68.73 126.83 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.81 26.36 68.73 261.72 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3127 definition: xcompl = 1 - (RELH_avg/100) TdC = 8.2289 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 = 0.6086 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3914 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.9893 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 = 4.8933 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.0077 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.079 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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