Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 64.78 12.21 82.61 0.00 04Dec2017 9 a.m. 66.67 12.71 78.91 27.79 04Dec2017 10 a.m. 68.45 12.76 75.07 179.58 04Dec2017 11 a.m. 71.31 13.48 67.10 309.73 04Dec2017 12 p.m. 73.17 10.40 61.09 215.85 04Dec2017 1 p.m. 75.22 8.68 52.55 263.82 04Dec2017 2 p.m. 76.33 10.33 44.76 233.23 04Dec2017 3 p.m. 73.51 13.89 43.66 197.85 04Dec2017 4 p.m. 67.21 14.56 43.07 85.58 04Dec2017 5 p.m. 62.38 8.42 37.73 22.86 04Dec2017 6 p.m. 60.13 5.57 41.99 0.00 04Dec2017 7 p.m. 39.79 2.54 27.66 0.00 04Dec2017 8 p.m. 53.85 14.36 38.65 0.00 04Dec2017 9 p.m. 49.96 13.76 39.33 0.00 04Dec2017 10 p.m. 46.60 13.57 40.97 0.00 04Dec2017 11 p.m. 43.68 11.67 44.65 0.00 05Dec2017 12 a.m. 41.83 12.65 45.68 0.00 05Dec2017 1 a.m. 39.85 14.25 46.89 0.00 05Dec2017 2 a.m. 37.87 12.85 46.53 0.00 05Dec2017 3 a.m. 35.83 12.79 41.12 0.00 05Dec2017 4 a.m. 34.07 12.21 39.69 0.00 05Dec2017 5 a.m. 33.19 10.07 40.41 0.00 05Dec2017 6 a.m. 33.03 9.27 41.02 0.00 05Dec2017 7 a.m. 33.12 6.50 40.63 0.00 Accuml. Values 1281.83 269.50 1161.77 1536.29 Num. Valid Values 24 24 24 24 Avg. Values 53.41 11.23 48.41 64.01 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 11.89 433.63 48.41 132.09 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5159 definition: xcompl = 1 - (RELH_avg/100) TdC = 1.3188 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 = 0.5822 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4178 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.3852 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 = 7.2206 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 9.5546 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.166 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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