Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 18.39 9.68 67.61 0.00 30Dec2017 9 a.m. 16.34 9.75 65.73 12.19 30Dec2017 10 a.m. 15.55 9.22 63.34 65.67 30Dec2017 11 a.m. 16.14 10.19 59.93 134.15 30Dec2017 12 p.m. 17.67 10.24 55.25 198.31 30Dec2017 1 p.m. 20.75 8.66 49.22 309.50 30Dec2017 2 p.m. 24.04 8.51 42.90 574.76 30Dec2017 3 p.m. 25.56 7.98 39.61 476.54 30Dec2017 4 p.m. 26.01 7.61 37.69 317.32 30Dec2017 5 p.m. 24.01 8.08 39.68 74.52 30Dec2017 6 p.m. 21.45 6.63 42.39 0.67 30Dec2017 7 p.m. 12.31 9.29 44.74 0.00 30Dec2017 8 p.m. 18.10 6.63 48.87 0.00 30Dec2017 9 p.m. 16.99 5.35 48.50 0.00 30Dec2017 10 p.m. 15.94 9.67 47.90 0.00 30Dec2017 11 p.m. 14.70 10.71 48.71 0.00 31Dec2017 12 a.m. 13.86 10.85 50.13 0.00 31Dec2017 1 a.m. 13.03 11.43 50.96 0.00 31Dec2017 2 a.m. 12.83 10.80 51.05 0.00 31Dec2017 3 a.m. 12.94 9.56 51.02 0.00 31Dec2017 4 a.m. 12.67 9.08 51.31 0.00 31Dec2017 5 a.m. 12.31 7.54 52.99 0.00 31Dec2017 6 a.m. 11.59 7.03 55.13 0.00 31Dec2017 7 a.m. 10.92 7.44 54.72 0.00 Accuml. Values 404.09 211.93 1219.38 2163.63 Num. Valid Values 24 24 24 24 Avg. Values 16.84 8.83 50.81 90.15 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.42 341.00 50.81 186.03 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4919 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.8411 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 = 0.2785 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7215 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.4887 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 = 1.6125 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.1453 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.066 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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