Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 03Dec2017 8 a.m. 49.44 0.08 97.92 18.00 03Dec2017 9 a.m. 59.90 0.59 73.21 99.00 03Dec2017 10 a.m. 64.40 3.28 63.55 213.00 03Dec2017 11 a.m. 67.91 3.06 40.35 295.00 03Dec2017 12 p.m. 68.79 2.88 44.63 228.00 03Dec2017 1 p.m. 70.90 3.30 47.56 271.00 03Dec2017 2 p.m. 71.01 2.12 52.94 239.00 03Dec2017 3 p.m. 72.00 2.49 40.91 304.00 03Dec2017 4 p.m. 70.11 1.24 51.10 119.00 03Dec2017 5 p.m. 68.68 2.05 40.90 63.00 03Dec2017 6 p.m. 66.61 1.87 53.30 2.00 03Dec2017 7 p.m. 61.56 5.94 78.83 0.00 03Dec2017 8 p.m. 66.49 5.46 54.27 0.00 03Dec2017 9 p.m. 67.03 4.59 49.88 0.00 03Dec2017 10 p.m. 67.05 2.73 49.09 0.00 03Dec2017 11 p.m. 66.81 2.42 46.83 0.00 04Dec2017 12 a.m. 65.61 1.22 43.96 0.00 04Dec2017 1 a.m. 65.39 1.99 48.48 0.00 04Dec2017 2 a.m. 64.62 3.52 50.85 0.00 04Dec2017 3 a.m. 63.64 2.60 56.17 0.00 04Dec2017 4 a.m. 62.96 4.36 62.15 0.00 04Dec2017 5 a.m. 62.76 2.24 69.61 0.00 04Dec2017 6 a.m. 62.10 2.33 74.30 0.00 04Dec2017 7 a.m. 62.10 1.30 78.75 0.00 Accuml. Values 1567.85 63.66 1369.54 1851.00 Num. Valid Values 24 24 24 24 Avg. Values 65.33 2.65 57.06 77.13 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 18.51 102.43 57.06 159.15 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4294 definition: xcompl = 1 - (RELH_avg/100) TdC = 9.9222 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 = 0.6691 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3309 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9004 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 = 9.0999 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.0061 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.089 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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