Detailed Weather Data for Project: HUDS

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 35.37 6.60 48.22 0.30 05Dec2017 9 a.m. 35.94 5.70 46.99 7.10 05Dec2017 10 a.m. 36.50 5.30 46.38 27.00 05Dec2017 11 a.m. 36.93 5.80 43.88 64.70 05Dec2017 12 p.m. 38.21 5.50 41.11 107.50 05Dec2017 1 p.m. 39.92 5.40 37.30 135.30 05Dec2017 2 p.m. 41.79 4.90 33.61 45.50 05Dec2017 3 p.m. 43.84 2.10 31.29 67.80 05Dec2017 4 p.m. 44.82 1.30 30.43 29.20 05Dec2017 5 p.m. 44.58 0.70 32.02 6.90 05Dec2017 6 p.m. 41.65 0.20 39.85 0.00 05Dec2017 7 p.m. 47.44 4.10 43.75 0.00 05Dec2017 8 p.m. 37.58 0.10 47.22 0.00 05Dec2017 9 p.m. 36.07 0.00 54.71 0.00 05Dec2017 10 p.m. 34.84 0.20 55.67 0.00 05Dec2017 11 p.m. 33.58 0.40 57.71 0.00 06Dec2017 12 a.m. 33.57 0.30 58.27 0.00 06Dec2017 1 a.m. 33.21 0.40 58.24 0.00 06Dec2017 2 a.m. 32.50 0.80 58.90 0.00 06Dec2017 3 a.m. 33.04 0.80 57.05 0.00 06Dec2017 4 a.m. 32.38 0.90 60.04 0.00 06Dec2017 5 a.m. 32.50 1.00 59.57 0.00 06Dec2017 6 a.m. 33.71 0.90 55.74 0.00 06Dec2017 7 a.m. 34.21 0.70 53.71 0.00 Accuml. Values 894.20 54.10 1151.66 491.30 Num. Valid Values 24 23 24 24 Avg. Values 37.26 2.35 47.99 20.47 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.92 90.83 47.99 42.24 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5201 definition: xcompl = 1 - (RELH_avg/100) TdC = -7.0749 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 = 0.4486 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5514 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.6471 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 = 3.9611 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.2949 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.038 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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