Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. -0.49 2.19 66.77 0.00 01Jan2018 9 a.m. 0.07 4.55 61.19 133.72 01Jan2018 10 a.m. 1.96 5.83 55.15 340.23 01Jan2018 11 a.m. 4.98 4.85 49.21 493.57 01Jan2018 12 p.m. 7.75 3.09 45.86 516.80 01Jan2018 1 p.m. 10.53 3.04 41.68 638.67 01Jan2018 2 p.m. 14.27 3.57 36.54 601.23 01Jan2018 3 p.m. 16.43 3.63 33.34 510.01 01Jan2018 4 p.m. 19.74 2.38 29.71 340.80 01Jan2018 5 p.m. 18.45 3.60 30.52 138.22 01Jan2018 6 p.m. 14.18 4.09 35.93 1.22 01Jan2018 7 p.m. 22.57 1.69 39.22 0.00 01Jan2018 8 p.m. 12.38 1.41 40.55 0.00 01Jan2018 9 p.m. 12.40 1.21 40.26 0.00 01Jan2018 10 p.m. 10.94 1.90 47.91 0.00 01Jan2018 11 p.m. 10.00 2.71 49.61 0.00 02Jan2018 12 a.m. 10.38 1.89 50.69 0.00 02Jan2018 1 a.m. 11.41 1.05 47.61 0.00 02Jan2018 2 a.m. 10.40 2.05 50.00 0.00 02Jan2018 3 a.m. 9.41 4.61 52.56 0.00 02Jan2018 4 a.m. 8.91 3.65 53.03 0.00 02Jan2018 5 a.m. 8.46 4.95 53.06 0.00 02Jan2018 6 a.m. 8.28 4.75 54.71 0.00 02Jan2018 7 a.m. 8.15 3.70 56.24 0.00 Accuml. Values 251.54 76.39 1121.35 3714.47 Num. Valid Values 24 24 24 24 Avg. Values 10.48 3.18 46.72 154.77 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -11.96 122.91 46.72 319.37 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5328 definition: xcompl = 1 - (RELH_avg/100) TdC = -21.1163 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 = 0.2313 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7687 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.6183 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 = 1.3204 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9916 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.045 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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