Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 33.48 2.86 42.56 0.00 05Dec2017 9 a.m. 33.82 3.49 42.10 33.76 05Dec2017 10 a.m. 35.65 4.94 37.27 140.87 05Dec2017 11 a.m. 37.26 5.43 32.75 248.44 05Dec2017 12 p.m. -901.00 -901.00 -901.00 -901.00 05Dec2017 1 p.m. 44.20 7.62 20.97 613.20 05Dec2017 2 p.m. 46.80 6.52 18.34 550.83 05Dec2017 3 p.m. 49.28 7.34 16.53 491.65 05Dec2017 4 p.m. 50.07 8.27 16.88 303.87 05Dec2017 5 p.m. 48.87 6.58 21.32 94.10 05Dec2017 6 p.m. 46.13 3.21 27.63 0.00 05Dec2017 7 p.m. 44.96 1.43 33.70 0.00 05Dec2017 8 p.m. 43.63 4.07 37.15 0.00 05Dec2017 9 p.m. 41.92 5.22 40.26 0.00 05Dec2017 10 p.m. 40.48 3.72 42.65 0.00 05Dec2017 11 p.m. 39.70 5.18 45.17 0.00 06Dec2017 12 a.m. 38.86 5.92 48.34 0.00 06Dec2017 1 a.m. 38.12 2.96 49.75 0.00 06Dec2017 2 a.m. 37.62 3.40 50.92 0.00 06Dec2017 3 a.m. 37.42 3.91 50.28 0.00 06Dec2017 4 a.m. 36.59 3.40 45.98 0.00 06Dec2017 5 a.m. 36.36 2.05 45.88 0.00 06Dec2017 6 a.m. 36.34 1.32 45.60 0.00 06Dec2017 7 a.m. 36.66 0.80 47.39 0.00 Accuml. Values 934.20 99.64 859.42 2476.72 Num. Valid Values 23 23 23 23 Avg. Values 40.62 4.33 37.37 107.68 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 4.79 167.29 37.37 222.21 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.6263 definition: xcompl = 1 - (RELH_avg/100) TdC = -8.6870 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 = 0.4773 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5227 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1580 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 = 5.4496 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 4.0246 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.105 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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