Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 0.09 6.94 69.35 0.00 01Jan2018 9 a.m. 0.34 6.99 67.33 93.94 01Jan2018 10 a.m. 1.98 6.44 59.73 249.46 01Jan2018 11 a.m. 4.48 5.82 52.60 375.51 01Jan2018 12 p.m. 7.03 4.14 47.07 462.24 01Jan2018 1 p.m. 9.57 4.45 45.32 492.56 01Jan2018 2 p.m. 11.30 5.49 42.86 466.14 01Jan2018 3 p.m. 12.76 5.29 40.02 375.61 01Jan2018 4 p.m. 13.69 4.19 37.13 258.42 01Jan2018 5 p.m. 13.62 4.03 36.42 72.59 01Jan2018 6 p.m. 12.33 2.03 40.04 0.00 01Jan2018 7 p.m. 20.50 1.22 36.53 0.00 01Jan2018 8 p.m. 10.98 0.83 44.83 0.00 01Jan2018 9 p.m. 11.32 1.06 46.14 0.00 01Jan2018 10 p.m. 11.46 2.61 46.64 0.00 01Jan2018 11 p.m. 11.52 4.03 47.72 0.00 02Jan2018 12 a.m. 11.52 4.10 45.87 0.00 02Jan2018 1 a.m. 11.44 3.32 43.60 0.00 02Jan2018 2 a.m. 10.76 2.81 44.98 0.00 02Jan2018 3 a.m. 10.71 2.48 46.62 0.00 02Jan2018 4 a.m. 10.65 2.88 48.41 0.00 02Jan2018 5 a.m. 10.51 3.46 49.41 0.00 02Jan2018 6 a.m. 10.36 2.91 50.34 0.00 02Jan2018 7 a.m. 10.15 3.11 51.68 0.00 Accuml. Values 239.05 90.63 1140.64 2846.47 Num. Valid Values 24 24 24 24 Avg. Values 9.96 3.78 47.53 118.60 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -12.24 145.82 47.53 244.74 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5247 definition: xcompl = 1 - (RELH_avg/100) TdC = -21.1816 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 = 0.2276 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7724 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9411 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 = 1.2701 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.0403 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.040 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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