Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 10.08 8.57 55.45 0.00 31Dec2017 9 a.m. 9.45 7.72 56.82 87.10 31Dec2017 10 a.m. 10.78 8.01 50.50 324.80 31Dec2017 11 a.m. 12.58 8.79 45.30 408.89 31Dec2017 12 p.m. 13.62 9.39 41.08 243.47 31Dec2017 1 p.m. 14.49 9.75 41.46 431.43 31Dec2017 2 p.m. 16.09 10.31 42.56 486.00 31Dec2017 3 p.m. 16.88 10.35 39.98 434.76 31Dec2017 4 p.m. 16.00 8.83 40.89 139.83 31Dec2017 5 p.m. 15.08 8.12 42.10 34.89 31Dec2017 6 p.m. 13.64 7.60 43.59 0.00 31Dec2017 7 p.m. 12.52 1.93 39.47 0.00 31Dec2017 8 p.m. 10.98 6.86 47.88 0.00 31Dec2017 9 p.m. 9.66 6.54 50.36 0.00 31Dec2017 10 p.m. 8.35 7.83 53.24 0.00 31Dec2017 11 p.m. 6.78 8.71 54.85 0.00 01Jan2018 12 a.m. 5.47 5.44 58.38 0.00 01Jan2018 1 a.m. 4.32 5.88 59.81 0.00 01Jan2018 2 a.m. 3.25 6.66 61.36 0.00 01Jan2018 3 a.m. 2.37 7.60 62.86 0.00 01Jan2018 4 a.m. 1.56 5.97 63.96 0.00 01Jan2018 5 a.m. 0.77 5.44 64.74 0.00 01Jan2018 6 a.m. 0.21 4.41 65.65 0.00 01Jan2018 7 a.m. -0.45 3.94 66.49 0.00 Accuml. Values 214.46 174.65 1248.78 2591.17 Num. Valid Values 24 24 24 24 Avg. Values 8.94 7.28 52.03 107.97 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -12.81 281.01 52.03 222.79 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4797 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.6379 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 = 0.2204 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7796 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.7424 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 = 1.1067 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.3502 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.048 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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