Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 08Nov2017 8 a.m. 41.90 6.60 82.07 24.50 08Nov2017 9 a.m. 42.19 5.80 80.06 90.10 08Nov2017 10 a.m. 43.27 5.00 77.00 113.00 08Nov2017 11 a.m. 44.58 3.80 73.08 154.10 08Nov2017 12 p.m. 46.69 3.80 68.96 329.40 08Nov2017 1 p.m. 47.91 4.20 66.40 252.20 08Nov2017 2 p.m. 49.05 3.40 64.20 233.90 08Nov2017 3 p.m. 49.96 3.50 61.87 252.10 08Nov2017 4 p.m. 51.17 4.50 56.34 248.20 08Nov2017 5 p.m. 50.97 2.40 56.38 70.10 08Nov2017 6 p.m. 47.91 1.30 65.82 0.00 08Nov2017 7 p.m. 47.57 2.00 69.84 0.00 08Nov2017 8 p.m. 40.19 0.70 86.99 0.00 08Nov2017 9 p.m. 38.73 1.90 91.89 0.00 08Nov2017 10 p.m. 41.47 4.00 98.04 0.00 08Nov2017 11 p.m. 41.00 2.00 96.18 0.00 09Nov2017 12 a.m. 36.28 1.20 98.19 0.00 09Nov2017 1 a.m. 35.51 2.30 98.95 0.00 09Nov2017 2 a.m. 34.66 1.20 98.99 0.00 09Nov2017 3 a.m. 32.74 0.50 99.00 0.00 09Nov2017 4 a.m. 32.23 1.40 99.05 0.00 09Nov2017 5 a.m. 31.33 0.80 99.07 0.00 09Nov2017 6 a.m. 33.06 1.60 99.18 0.00 09Nov2017 7 a.m. 33.67 3.50 99.23 0.00 Accuml. Values 994.06 67.40 1986.78 1767.60 Num. Valid Values 24 24 24 24 Avg. Values 41.42 2.81 82.78 73.65 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 5.23 108.45 82.78 151.98 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1722 definition: xcompl = 1 - (RELH_avg/100) TdC = 2.5418 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 = 0.4841 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5159 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.4380 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 = 1.5355 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.0712 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.030 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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