Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 06Dec2017 8 a.m. 32.49 1.84 57.53 4.60 06Dec2017 9 a.m. 35.91 3.74 51.81 128.37 06Dec2017 10 a.m. 40.15 3.09 46.01 281.50 06Dec2017 11 a.m. 44.17 3.91 42.76 402.71 06Dec2017 12 p.m. 48.00 4.86 37.14 473.31 06Dec2017 1 p.m. 50.79 6.07 31.84 491.33 06Dec2017 2 p.m. 51.89 8.64 30.97 447.93 06Dec2017 3 p.m. 51.73 8.22 32.07 358.50 06Dec2017 4 p.m. 50.97 8.89 32.98 220.24 06Dec2017 5 p.m. 49.84 6.39 31.75 46.29 06Dec2017 6 p.m. 47.03 5.06 31.67 0.00 06Dec2017 7 p.m. 30.96 4.35 37.83 0.00 06Dec2017 8 p.m. 42.42 2.36 40.11 0.00 06Dec2017 9 p.m. 40.14 3.25 43.65 0.00 06Dec2017 10 p.m. 39.96 3.86 46.29 0.00 06Dec2017 11 p.m. 38.59 8.32 49.52 0.00 07Dec2017 12 a.m. 36.90 7.88 55.89 0.00 07Dec2017 1 a.m. 34.02 12.81 55.07 0.00 07Dec2017 2 a.m. 31.68 12.51 56.48 0.00 07Dec2017 3 a.m. 29.52 10.81 53.47 0.00 07Dec2017 4 a.m. 27.30 12.02 55.09 0.00 07Dec2017 5 a.m. 25.48 9.82 59.46 0.00 07Dec2017 6 a.m. 23.97 8.18 63.41 0.00 07Dec2017 7 a.m. 22.75 8.11 67.11 0.00 Accuml. Values 926.63 164.99 1109.91 2854.78 Num. Valid Values 24 24 24 24 Avg. Values 38.61 6.87 46.25 118.95 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.67 265.47 46.25 245.45 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5375 definition: xcompl = 1 - (RELH_avg/100) TdC = -6.8794 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 = 0.4602 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5398 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.3677 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 = 4.3187 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 4.3113 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.116 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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