Detailed Weather Data for Project: HUDS

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 50.65 1.80 68.57 11.90 02Dec2017 9 a.m. 55.20 0.30 55.68 133.20 02Dec2017 10 a.m. 60.26 1.00 47.67 273.10 02Dec2017 11 a.m. 64.08 1.30 48.53 212.00 02Dec2017 12 p.m. 66.15 1.60 48.63 39.70 02Dec2017 1 p.m. 67.21 1.60 49.49 52.20 02Dec2017 2 p.m. 67.33 1.20 50.67 21.80 02Dec2017 3 p.m. 64.60 2.90 60.55 17.50 02Dec2017 4 p.m. 65.79 1.70 55.75 13.80 02Dec2017 5 p.m. 66.18 1.50 54.64 2.70 02Dec2017 6 p.m. 64.18 0.50 59.78 0.00 02Dec2017 7 p.m. 67.93 4.50 65.78 0.00 02Dec2017 8 p.m. 57.60 0.90 77.03 0.00 02Dec2017 9 p.m. 55.53 0.60 82.44 0.00 02Dec2017 10 p.m. 55.08 3.30 84.40 0.00 02Dec2017 11 p.m. 54.03 2.90 86.00 0.00 03Dec2017 12 a.m. 52.48 2.30 86.38 0.00 03Dec2017 1 a.m. 49.28 1.40 91.94 0.00 03Dec2017 2 a.m. 50.50 0.30 92.33 0.00 03Dec2017 3 a.m. 49.73 1.20 92.44 0.00 03Dec2017 4 a.m. 49.30 2.60 92.80 0.00 03Dec2017 5 a.m. 54.97 0.90 84.22 0.00 03Dec2017 6 a.m. 58.91 0.50 74.78 0.00 03Dec2017 7 a.m. 58.64 0.40 75.70 0.00 Accuml. Values 1405.60 37.20 1686.20 777.90 Num. Valid Values 24 24 24 24 Avg. Values 58.57 1.55 70.26 32.41 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 14.76 59.85 70.26 66.88 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2974 definition: xcompl = 1 - (RELH_avg/100) TdC = 9.4672 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 = 0.6214 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3786 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.2883 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 = 4.9439 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.4225 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.029 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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