Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 03Mar2018 8 a.m. 45.90 8.10 64.52 65.37 03Mar2018 9 a.m. 48.00 8.14 62.65 314.54 03Mar2018 10 a.m. 52.00 11.30 58.72 532.98 03Mar2018 11 a.m. 56.37 14.78 52.50 636.96 03Mar2018 12 p.m. 59.38 14.35 48.12 723.80 03Mar2018 1 p.m. 61.86 14.38 45.69 782.20 03Mar2018 2 p.m. 62.80 13.14 45.66 435.29 03Mar2018 3 p.m. 65.93 12.86 42.14 713.96 03Mar2018 4 p.m. 66.81 15.07 41.91 581.75 03Mar2018 5 p.m. 66.65 15.20 42.42 365.46 03Mar2018 6 p.m. 65.93 10.74 43.56 126.83 03Mar2018 7 p.m. 56.70 10.69 67.99 0.00 03Mar2018 8 p.m. 61.30 11.17 51.11 0.00 03Mar2018 9 p.m. 59.99 11.03 52.79 0.00 03Mar2018 10 p.m. 58.73 11.10 52.86 0.00 03Mar2018 11 p.m. 57.42 11.66 52.39 0.00 04Mar2018 12 a.m. 55.99 12.34 51.86 0.00 04Mar2018 1 a.m. 54.48 10.51 52.71 0.00 04Mar2018 2 a.m. 53.51 9.60 52.31 0.00 04Mar2018 3 a.m. 52.83 8.51 52.34 0.00 04Mar2018 4 a.m. 51.31 7.23 55.58 0.00 04Mar2018 5 a.m. 50.97 8.45 57.32 0.00 04Mar2018 6 a.m. 51.53 7.68 57.05 0.00 04Mar2018 7 a.m. 52.16 7.82 56.85 0.00 Accuml. Values 1368.55 265.85 1261.05 5279.14 Num. Valid Values 24 24 24 24 Avg. Values 57.02 11.08 52.54 219.96 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.90 427.75 52.54 453.90 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4746 definition: xcompl = 1 - (RELH_avg/100) TdC = 4.3716 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 = 0.6099 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3901 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.5415 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 = 7.5438 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 9.8291 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.260 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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