Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. 10.00 2.60 52.63 0.00 02Jan2018 9 a.m. 10.38 2.44 52.20 6.93 02Jan2018 10 a.m. 11.21 1.92 50.68 38.07 02Jan2018 11 a.m. 12.34 1.41 49.96 86.84 02Jan2018 12 p.m. 13.91 1.84 50.53 159.90 02Jan2018 1 p.m. 16.54 2.39 46.54 387.68 02Jan2018 2 p.m. 19.92 2.40 40.38 396.13 02Jan2018 3 p.m. 23.25 2.64 34.40 439.15 02Jan2018 4 p.m. 25.03 3.54 31.05 287.64 02Jan2018 5 p.m. 24.67 2.31 30.65 71.82 02Jan2018 6 p.m. 22.42 1.72 32.72 0.00 02Jan2018 7 p.m. 28.53 2.37 47.35 0.00 02Jan2018 8 p.m. 19.29 1.35 38.97 0.00 02Jan2018 9 p.m. 18.00 2.97 43.29 0.00 02Jan2018 10 p.m. 17.46 3.26 43.56 0.00 02Jan2018 11 p.m. 16.27 2.04 44.42 0.00 03Jan2018 12 a.m. 15.73 2.19 45.32 0.00 03Jan2018 1 a.m. 15.42 2.27 46.66 0.00 03Jan2018 2 a.m. 15.26 2.24 48.05 0.00 03Jan2018 3 a.m. 15.67 2.40 49.72 0.00 03Jan2018 4 a.m. 15.51 2.97 50.32 0.00 03Jan2018 5 a.m. 15.12 2.09 51.53 0.00 03Jan2018 6 a.m. 14.61 1.77 54.08 0.00 03Jan2018 7 a.m. 15.48 2.82 56.59 0.00 Accuml. Values 412.03 55.95 1091.60 1874.16 Num. Valid Values 24 24 24 24 Avg. Values 17.17 2.33 45.48 78.09 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.24 90.02 45.48 161.14 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5452 definition: xcompl = 1 - (RELH_avg/100) TdC = -18.0236 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 = 0.2811 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7189 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.2758 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 = 1.8162 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.1515 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.036 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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