Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 08Nov2017 8 a.m. 31.03 8.00 93.95 38.40 08Nov2017 9 a.m. 32.92 4.50 88.95 237.70 08Nov2017 10 a.m. 37.56 3.70 72.63 458.50 08Nov2017 11 a.m. 39.70 5.50 73.90 587.70 08Nov2017 12 p.m. 42.82 6.10 65.12 653.40 08Nov2017 1 p.m. 45.32 6.70 55.05 651.60 08Nov2017 2 p.m. 48.24 5.00 47.20 579.50 08Nov2017 3 p.m. 50.99 2.80 40.32 450.40 08Nov2017 4 p.m. 51.73 5.10 33.56 280.10 08Nov2017 5 p.m. 51.58 2.00 33.17 89.00 08Nov2017 6 p.m. 49.37 1.00 36.56 0.00 08Nov2017 7 p.m. 46.15 2.70 43.13 0.00 08Nov2017 8 p.m. 44.20 2.00 49.58 0.00 08Nov2017 9 p.m. 42.22 1.30 56.03 0.00 08Nov2017 10 p.m. 40.46 0.10 56.94 0.00 08Nov2017 11 p.m. 33.48 4.40 90.26 0.00 09Nov2017 12 a.m. 31.86 4.80 97.11 0.00 09Nov2017 1 a.m. 33.55 3.30 86.43 0.00 09Nov2017 2 a.m. 32.40 4.10 88.69 0.00 09Nov2017 3 a.m. 34.68 2.90 76.36 0.00 09Nov2017 4 a.m. 36.75 1.20 73.65 0.00 09Nov2017 5 a.m. 37.47 2.80 74.05 0.00 09Nov2017 6 a.m. 31.96 3.30 90.50 0.00 09Nov2017 7 a.m. 32.38 3.30 86.13 0.00 Accuml. Values 958.82 86.60 1609.27 4026.30 Num. Valid Values 24 24 24 24 Avg. Values 39.95 3.61 67.05 167.76 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 4.42 139.34 67.05 346.18 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3295 definition: xcompl = 1 - (RELH_avg/100) TdC = -1.1224 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 = 0.4716 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5284 definition: del_lambda2 = 1 - del_lambda1 Qn = 2.5223 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 = 2.7574 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.0120 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.089 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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