Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 64.20 12.98 81.55 0.00 04Dec2017 9 a.m. 64.44 13.55 82.44 5.09 04Dec2017 10 a.m. 66.00 13.95 80.77 103.77 04Dec2017 11 a.m. 68.04 18.69 73.93 128.21 04Dec2017 12 p.m. 70.41 17.29 65.97 236.61 04Dec2017 1 p.m. 71.35 14.10 61.87 360.56 04Dec2017 2 p.m. 72.82 8.63 53.15 250.00 04Dec2017 3 p.m. 73.11 10.80 47.42 247.69 04Dec2017 4 p.m. 67.78 11.01 36.94 241.55 04Dec2017 5 p.m. 65.08 6.70 35.68 72.59 04Dec2017 6 p.m. 63.18 8.74 31.76 0.00 04Dec2017 7 p.m. 44.60 2.16 32.38 0.00 04Dec2017 8 p.m. 52.27 12.17 40.03 0.00 04Dec2017 9 p.m. 48.78 10.29 39.63 0.00 04Dec2017 10 p.m. 45.84 10.87 42.25 0.00 04Dec2017 11 p.m. 43.38 8.57 45.54 0.00 05Dec2017 12 a.m. 40.80 9.88 48.12 0.00 05Dec2017 1 a.m. 38.16 9.83 46.27 0.00 05Dec2017 2 a.m. 35.87 8.81 41.11 0.00 05Dec2017 3 a.m. 34.52 6.47 42.01 0.00 05Dec2017 4 a.m. 33.57 4.51 42.22 0.00 05Dec2017 5 a.m. 33.01 5.58 43.03 0.00 05Dec2017 6 a.m. 32.97 4.69 42.87 0.00 05Dec2017 7 a.m. 33.13 3.33 42.06 0.00 Accuml. Values 1263.31 233.60 1199.00 1646.07 Num. Valid Values 24 24 24 24 Avg. Values 52.64 9.73 49.96 68.59 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 11.47 375.86 49.96 141.53 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5004 definition: xcompl = 1 - (RELH_avg/100) TdC = 1.3765 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 = 0.5762 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4238 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.4796 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 = 6.8032 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 8.1614 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.147 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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