Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 06Dec2017 8 a.m. 32.54 0.36 80.84 9.00 06Dec2017 9 a.m. 34.29 0.33 74.98 61.00 06Dec2017 10 a.m. 38.80 0.30 57.82 157.00 06Dec2017 11 a.m. 41.99 0.58 49.15 252.00 06Dec2017 12 p.m. 45.39 3.47 36.51 333.00 06Dec2017 1 p.m. 47.91 1.52 32.42 362.00 06Dec2017 2 p.m. 48.79 0.74 30.90 344.00 06Dec2017 3 p.m. 50.32 0.81 29.67 238.00 06Dec2017 4 p.m. 50.32 1.52 31.50 169.00 06Dec2017 5 p.m. 49.44 0.99 33.39 50.00 06Dec2017 6 p.m. 46.15 1.45 45.48 1.00 06Dec2017 7 p.m. 31.98 5.62 40.24 0.00 06Dec2017 8 p.m. 39.88 0.20 63.86 0.00 06Dec2017 9 p.m. 40.68 0.37 63.19 0.00 06Dec2017 10 p.m. 39.45 0.86 67.96 0.00 06Dec2017 11 p.m. 38.35 0.36 70.76 0.00 07Dec2017 12 a.m. 32.20 0.19 83.15 0.00 07Dec2017 1 a.m. 29.89 0.12 86.34 0.00 07Dec2017 2 a.m. 27.59 0.41 91.65 0.00 07Dec2017 3 a.m. 29.57 0.26 90.37 0.00 07Dec2017 4 a.m. 34.63 0.59 65.51 0.00 07Dec2017 5 a.m. 33.73 0.63 64.10 0.00 07Dec2017 6 a.m. 33.42 1.80 67.96 0.00 07Dec2017 7 a.m. 30.67 4.56 54.71 0.00 Accuml. Values 928.00 28.04 1412.46 1976.00 Num. Valid Values 24 24 24 24 Avg. Values 38.67 1.17 58.85 82.33 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.70 45.12 58.85 169.90 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4115 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.5798 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 = 0.4607 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5393 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.5833 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 = 3.2894 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.5707 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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