Detailed Weather Data for Project: WDMA

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 41.63 2.50 73.37 0.00 30Dec2017 9 a.m. 41.58 5.50 72.47 5.40 30Dec2017 10 a.m. 40.21 9.10 71.23 31.00 30Dec2017 11 a.m. 38.35 10.30 72.99 41.20 30Dec2017 12 p.m. 37.44 8.10 73.83 48.10 30Dec2017 1 p.m. 36.64 8.50 74.94 43.80 30Dec2017 2 p.m. 35.51 8.30 75.25 46.90 30Dec2017 3 p.m. 34.88 6.80 73.92 64.80 30Dec2017 4 p.m. 34.61 7.30 72.46 27.30 30Dec2017 5 p.m. 33.93 6.80 72.72 0.60 30Dec2017 6 p.m. 33.10 6.60 73.13 0.00 30Dec2017 7 p.m. 23.56 10.40 36.36 0.00 30Dec2017 8 p.m. 31.96 4.50 73.47 0.00 30Dec2017 9 p.m. 31.73 3.80 74.11 0.00 30Dec2017 10 p.m. 31.46 2.30 75.58 0.00 30Dec2017 11 p.m. 31.44 2.80 84.04 0.00 31Dec2017 12 a.m. 31.28 4.10 89.73 0.00 31Dec2017 1 a.m. 30.83 4.00 92.43 0.00 31Dec2017 2 a.m. 30.74 4.40 93.07 0.00 31Dec2017 3 a.m. 30.40 5.70 93.25 0.00 31Dec2017 4 a.m. 30.22 3.80 92.94 0.00 31Dec2017 5 a.m. 29.88 6.40 91.49 0.00 31Dec2017 6 a.m. 28.40 10.40 89.67 0.00 31Dec2017 7 a.m. 26.64 8.60 87.98 0.00 Accuml. Values 796.40 151.00 1880.43 309.10 Num. Valid Values 24 24 24 24 Avg. Values 33.18 6.29 78.35 12.88 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 0.66 242.96 78.35 26.58 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2165 definition: xcompl = 1 - (RELH_avg/100) TdC = -2.6680 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 = 0.4137 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5863 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.7949 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 = 1.3938 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.5062 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.022 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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