Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 40.77 7.33 53.91 12.00 05Dec2017 9 a.m. 40.01 7.91 54.40 86.00 05Dec2017 10 a.m. 38.91 8.02 55.20 88.00 05Dec2017 11 a.m. 39.58 6.05 53.24 159.00 05Dec2017 12 p.m. 39.88 5.69 46.64 140.00 05Dec2017 1 p.m. 39.99 6.57 42.74 148.00 05Dec2017 2 p.m. 41.97 5.74 31.20 309.00 05Dec2017 3 p.m. 41.65 5.26 29.30 215.00 05Dec2017 4 p.m. 41.22 4.51 35.29 143.00 05Dec2017 5 p.m. 40.66 0.64 38.71 43.00 05Dec2017 6 p.m. 39.56 0.32 45.48 1.00 05Dec2017 7 p.m. 39.13 0.37 61.97 0.00 05Dec2017 8 p.m. 38.91 0.92 49.33 0.00 05Dec2017 9 p.m. 37.04 0.27 55.87 0.00 05Dec2017 10 p.m. 37.58 0.32 52.56 0.00 05Dec2017 11 p.m. 35.82 0.26 64.71 0.00 06Dec2017 12 a.m. 32.52 0.40 74.79 0.00 06Dec2017 1 a.m. 30.78 0.37 80.60 0.00 06Dec2017 2 a.m. 29.79 0.39 86.95 0.00 06Dec2017 3 a.m. 30.43 0.40 85.29 0.00 06Dec2017 4 a.m. 33.19 0.19 64.29 0.00 06Dec2017 5 a.m. 32.97 0.46 71.86 0.00 06Dec2017 6 a.m. 32.65 0.35 67.83 0.00 06Dec2017 7 a.m. 32.86 0.38 72.35 0.00 Accuml. Values 887.86 63.12 1374.51 1344.00 Num. Valid Values 24 24 24 24 Avg. Values 36.99 2.63 57.27 56.00 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.77 101.56 57.27 115.56 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4273 definition: xcompl = 1 - (RELH_avg/100) TdC = -4.8253 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 = 0.4464 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5536 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.0307 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 = 3.2033 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9904 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.044 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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