Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 63.43 1.85 75.71 6.00 04Dec2017 9 a.m. 64.72 1.51 74.36 42.00 04Dec2017 10 a.m. 66.27 2.49 65.33 69.00 04Dec2017 11 a.m. 67.15 2.00 65.76 70.00 04Dec2017 12 p.m. 69.69 3.34 37.18 124.00 04Dec2017 1 p.m. 71.20 5.24 44.93 199.00 04Dec2017 2 p.m. 70.45 4.25 48.84 95.00 04Dec2017 3 p.m. 71.87 4.22 40.90 236.00 04Dec2017 4 p.m. 73.29 4.26 51.53 189.00 04Dec2017 5 p.m. 71.44 2.70 55.93 37.00 04Dec2017 6 p.m. 70.90 2.20 53.55 1.00 04Dec2017 7 p.m. 37.47 0.39 52.01 0.00 04Dec2017 8 p.m. 61.97 0.90 75.95 1.00 04Dec2017 9 p.m. 61.75 7.33 41.03 0.00 04Dec2017 10 p.m. 60.76 5.29 35.23 0.00 04Dec2017 11 p.m. 57.92 6.49 34.86 0.00 05Dec2017 12 a.m. 53.96 6.90 39.74 0.00 05Dec2017 1 a.m. 51.12 8.32 41.76 0.00 05Dec2017 2 a.m. 49.33 7.31 38.89 0.00 05Dec2017 3 a.m. 46.81 6.17 41.15 0.00 05Dec2017 4 a.m. 45.18 6.86 47.69 0.00 05Dec2017 5 a.m. 43.41 6.69 49.82 0.00 05Dec2017 6 a.m. 42.53 4.54 51.10 0.00 05Dec2017 7 a.m. 41.65 7.26 51.28 0.00 Accuml. Values 1414.29 108.51 1214.53 1069.00 Num. Valid Values 24 24 24 24 Avg. Values 58.93 4.52 50.61 44.54 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 14.96 174.59 50.61 91.91 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4939 definition: xcompl = 1 - (RELH_avg/100) TdC = 4.8005 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 = 0.6241 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3759 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.0020 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 = 8.4140 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 6.0362 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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