Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 61.81 10.10 85.00 3.40 04Dec2017 9 a.m. 62.49 9.20 84.93 7.80 04Dec2017 10 a.m. 63.64 7.40 83.07 7.50 04Dec2017 11 a.m. 65.68 5.80 79.21 92.30 04Dec2017 12 p.m. 66.85 6.00 77.23 129.90 04Dec2017 1 p.m. 68.34 13.10 74.54 245.80 04Dec2017 2 p.m. 70.75 12.20 68.03 301.70 04Dec2017 3 p.m. 71.74 10.70 65.24 157.20 04Dec2017 4 p.m. 72.64 12.00 63.29 76.80 04Dec2017 5 p.m. 67.44 8.90 72.72 0.00 04Dec2017 6 p.m. 62.15 3.70 89.65 0.00 04Dec2017 7 p.m. 32.56 1.60 54.21 0.00 04Dec2017 8 p.m. 60.13 7.90 49.52 0.00 04Dec2017 9 p.m. 59.27 9.60 41.21 0.00 04Dec2017 10 p.m. 56.46 15.40 39.23 0.00 04Dec2017 11 p.m. 52.38 12.90 43.09 0.00 05Dec2017 12 a.m. 49.73 7.90 44.10 0.00 05Dec2017 1 a.m. 47.16 7.40 46.12 0.00 05Dec2017 2 a.m. 44.85 7.40 46.07 0.00 05Dec2017 3 a.m. 42.96 7.80 48.52 0.00 05Dec2017 4 a.m. 41.47 8.90 50.86 0.00 05Dec2017 5 a.m. 40.55 7.20 53.86 0.00 05Dec2017 6 a.m. 38.98 10.50 57.62 0.00 05Dec2017 7 a.m. 36.86 9.30 54.13 0.00 Accuml. Values 1336.91 212.90 1471.45 1022.40 Num. Valid Values 24 24 24 24 Avg. Values 55.70 8.87 61.31 42.60 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.17 342.56 61.31 87.91 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3869 definition: xcompl = 1 - (RELH_avg/100) TdC = 5.9502 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 = 0.5999 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4001 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.0787 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 = 5.8304 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 6.6694 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.103 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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