Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 10.83 12.45 55.81 0.00 31Dec2017 9 a.m. 10.27 13.74 57.72 49.08 31Dec2017 10 a.m. 9.84 13.32 58.10 150.99 31Dec2017 11 a.m. 11.84 11.20 51.74 327.06 31Dec2017 12 p.m. 13.68 12.40 43.65 412.68 31Dec2017 1 p.m. 14.95 11.94 39.24 414.91 31Dec2017 2 p.m. 15.53 11.12 39.02 301.77 31Dec2017 3 p.m. 16.23 13.07 42.62 367.68 31Dec2017 4 p.m. 15.67 10.97 42.42 155.86 31Dec2017 5 p.m. 14.97 10.53 43.58 40.07 31Dec2017 6 p.m. 13.87 10.42 45.25 0.00 31Dec2017 7 p.m. 11.37 1.47 41.88 0.00 31Dec2017 8 p.m. 12.06 9.71 47.28 0.00 31Dec2017 9 p.m. 10.67 9.04 49.58 0.00 31Dec2017 10 p.m. 9.30 8.75 51.54 0.00 31Dec2017 11 p.m. 8.06 7.83 54.29 0.00 01Jan2018 12 a.m. 6.80 7.98 56.04 0.00 01Jan2018 1 a.m. 5.67 8.38 59.04 0.00 01Jan2018 2 a.m. 4.48 9.36 60.28 0.00 01Jan2018 3 a.m. 3.42 7.99 61.91 0.00 01Jan2018 4 a.m. 2.53 8.48 63.67 0.00 01Jan2018 5 a.m. 1.87 9.01 64.79 0.00 01Jan2018 6 a.m. 1.40 7.99 68.37 0.00 01Jan2018 7 a.m. 0.72 7.97 68.69 0.00 Accuml. Values 226.04 235.12 1266.51 2220.10 Num. Valid Values 24 24 24 24 Avg. Values 9.42 9.80 52.77 92.50 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -12.55 378.31 52.77 190.88 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4723 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.2207 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 = 0.2238 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7762 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.4749 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 = 1.1134 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.6675 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.055 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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