Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 06Nov2017 8 a.m. 55.27 0.28 74.05 19.00 06Nov2017 9 a.m. 56.28 0.82 74.37 41.00 06Nov2017 10 a.m. 58.03 0.09 72.59 50.00 06Nov2017 11 a.m. 58.78 0.15 75.58 86.00 06Nov2017 12 p.m. 57.36 0.37 90.11 102.00 06Nov2017 1 p.m. 57.60 0.35 94.94 108.00 06Nov2017 2 p.m. 57.15 0.87 94.02 58.00 06Nov2017 3 p.m. 57.15 0.92 94.76 57.00 06Nov2017 4 p.m. 56.82 0.92 95.91 26.00 06Nov2017 5 p.m. 55.83 3.62 94.46 10.00 06Nov2017 6 p.m. 55.27 3.92 95.73 1.00 06Nov2017 7 p.m. 46.60 4.44 88.78 0.00 06Nov2017 8 p.m. 52.20 4.82 96.03 0.00 06Nov2017 9 p.m. 50.23 5.40 92.07 1.00 06Nov2017 10 p.m. 48.90 5.73 91.09 1.00 06Nov2017 11 p.m. 47.80 5.36 89.21 1.00 07Nov2017 12 a.m. 46.92 5.22 87.85 0.00 07Nov2017 1 a.m. 46.60 5.03 87.48 1.00 07Nov2017 2 a.m. 46.60 3.97 88.58 0.00 07Nov2017 3 a.m. 46.26 3.40 87.00 0.00 07Nov2017 4 a.m. 45.84 1.79 88.41 0.00 07Nov2017 5 a.m. 45.50 2.36 89.13 1.00 07Nov2017 6 a.m. 45.39 3.19 88.95 0.00 07Nov2017 7 a.m. 45.05 4.98 88.77 1.00 Accuml. Values 1239.44 68.00 2119.87 564.00 Num. Valid Values 24 24 24 24 Avg. Values 51.64 2.83 88.33 23.50 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 10.91 109.41 88.33 48.49 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1167 definition: xcompl = 1 - (RELH_avg/100) TdC = 9.0422 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 = 0.5683 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4317 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.5287 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 = 1.5392 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.0776 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.006 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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