Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 42.24 2.94 76.60 8.22 02Dec2017 9 a.m. 45.93 1.61 71.24 172.11 02Dec2017 10 a.m. 49.64 2.66 64.46 353.81 02Dec2017 11 a.m. 54.07 1.24 55.67 499.19 02Dec2017 12 p.m. 58.35 1.92 50.96 583.79 02Dec2017 1 p.m. 61.30 2.15 49.43 602.62 02Dec2017 2 p.m. 64.99 2.70 46.32 549.89 02Dec2017 3 p.m. 66.24 3.00 44.52 431.41 02Dec2017 4 p.m. 69.08 1.53 41.31 267.73 02Dec2017 5 p.m. 66.22 2.44 46.73 48.43 02Dec2017 6 p.m. 62.19 3.16 53.47 0.00 02Dec2017 7 p.m. 64.74 12.24 71.66 0.00 02Dec2017 8 p.m. 57.38 4.64 63.32 0.00 02Dec2017 9 p.m. 57.11 4.44 63.96 0.00 02Dec2017 10 p.m. 55.78 2.71 66.75 0.00 02Dec2017 11 p.m. 53.74 2.33 70.55 0.00 03Dec2017 12 a.m. 52.59 1.72 72.03 0.00 03Dec2017 1 a.m. 51.40 4.57 74.38 0.00 03Dec2017 2 a.m. 51.44 6.78 73.51 0.00 03Dec2017 3 a.m. 50.38 5.49 74.47 0.00 03Dec2017 4 a.m. 47.73 3.46 78.93 0.00 03Dec2017 5 a.m. 48.56 1.97 79.84 0.00 03Dec2017 6 a.m. 48.27 2.29 81.46 0.00 03Dec2017 7 a.m. 47.91 3.48 82.60 0.00 Accuml. Values 1327.30 81.47 1554.17 3517.20 Num. Valid Values 24 24 24 24 Avg. Values 55.30 3.39 64.76 146.55 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 12.95 131.09 64.76 302.41 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3524 definition: xcompl = 1 - (RELH_avg/100) TdC = 6.5376 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 = 0.5969 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4031 definition: del_lambda2 = 1 - del_lambda1 Qn = 2.4556 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 = 5.2250 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.4283 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.112 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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