Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 33.12 4.83 39.93 0.00 05Dec2017 9 a.m. 33.60 4.43 39.89 18.06 05Dec2017 10 a.m. 35.33 4.92 38.09 121.27 05Dec2017 11 a.m. 38.26 5.91 30.98 367.00 05Dec2017 12 p.m. 39.45 5.81 28.59 318.61 05Dec2017 1 p.m. 42.03 5.73 25.65 465.90 05Dec2017 2 p.m. 43.48 6.88 24.67 448.48 05Dec2017 3 p.m. 45.70 5.79 21.94 363.02 05Dec2017 4 p.m. 46.74 6.09 21.72 233.34 05Dec2017 5 p.m. 46.49 6.34 23.23 43.68 05Dec2017 6 p.m. 42.96 2.06 22.68 0.00 05Dec2017 7 p.m. 44.89 4.28 34.01 0.00 05Dec2017 8 p.m. 38.12 2.24 30.41 0.00 05Dec2017 9 p.m. 36.84 2.40 33.16 0.00 05Dec2017 10 p.m. 36.00 1.98 36.03 0.00 05Dec2017 11 p.m. 34.90 2.56 39.55 0.00 06Dec2017 12 a.m. 34.70 2.17 41.58 0.00 06Dec2017 1 a.m. 34.21 1.90 43.45 0.00 06Dec2017 2 a.m. 32.77 2.20 46.89 0.00 06Dec2017 3 a.m. 32.86 3.51 47.26 0.00 06Dec2017 4 a.m. 33.40 3.66 46.89 0.00 06Dec2017 5 a.m. 33.12 1.73 48.55 0.00 06Dec2017 6 a.m. 33.30 1.86 49.51 0.00 06Dec2017 7 a.m. 33.12 2.13 52.39 0.00 Accuml. Values 905.39 91.41 867.05 2379.36 Num. Valid Values 24 24 24 24 Avg. Values 37.72 3.81 36.13 99.14 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.18 147.08 36.13 204.58 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.6387 definition: xcompl = 1 - (RELH_avg/100) TdC = -10.5567 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 = 0.4526 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5474 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9228 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 = 4.9662 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.4685 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.091 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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