Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 06Dec2017 8 a.m. 36.03 1.39 50.84 2.49 06Dec2017 9 a.m. 38.44 2.27 47.37 189.11 06Dec2017 10 a.m. 41.31 2.28 46.25 371.44 06Dec2017 11 a.m. 46.06 3.36 41.22 516.02 06Dec2017 12 p.m. 50.32 5.85 33.56 603.10 06Dec2017 1 p.m. 51.57 6.73 32.91 622.86 06Dec2017 2 p.m. 52.43 7.47 33.39 544.24 06Dec2017 3 p.m. 52.45 8.09 31.72 386.42 06Dec2017 4 p.m. 52.63 7.68 25.06 278.99 06Dec2017 5 p.m. 51.10 5.85 25.76 96.21 06Dec2017 6 p.m. 47.17 4.10 30.22 0.00 06Dec2017 7 p.m. 29.86 2.14 38.66 0.00 06Dec2017 8 p.m. 42.76 1.46 35.33 0.00 06Dec2017 9 p.m. 40.64 2.31 41.12 0.00 06Dec2017 10 p.m. 38.39 5.03 48.89 0.00 06Dec2017 11 p.m. 37.67 5.00 53.74 0.00 07Dec2017 12 a.m. 34.72 6.50 57.57 0.00 07Dec2017 1 a.m. 32.13 8.12 53.35 0.00 07Dec2017 2 a.m. 30.63 6.94 50.74 0.00 07Dec2017 3 a.m. 28.35 7.08 53.41 0.00 07Dec2017 4 a.m. 26.11 6.19 57.36 0.00 07Dec2017 5 a.m. 24.64 6.02 61.46 0.00 07Dec2017 6 a.m. 23.49 5.39 64.42 0.00 07Dec2017 7 a.m. 22.15 4.85 67.63 0.00 Accuml. Values 931.04 122.10 1081.98 3610.88 Num. Valid Values 24 24 24 24 Avg. Values 38.79 5.09 45.08 150.45 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.77 196.46 45.08 310.46 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5492 definition: xcompl = 1 - (RELH_avg/100) TdC = -7.1272 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 = 0.4618 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5382 definition: del_lambda2 = 1 - del_lambda1 Qn = 2.0836 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 = 4.4459 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.6789 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.116 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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