Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 08Nov2017 8 a.m. 39.87 8.84 88.00 15.75 08Nov2017 9 a.m. 40.40 11.33 84.33 51.00 08Nov2017 10 a.m. 41.13 11.24 81.75 83.00 08Nov2017 11 a.m. 42.02 9.77 78.33 141.00 08Nov2017 12 p.m. 43.29 9.45 73.75 155.25 08Nov2017 1 p.m. 44.66 10.66 68.00 175.33 08Nov2017 2 p.m. 45.81 8.50 64.75 189.25 08Nov2017 3 p.m. 47.07 7.27 61.75 177.75 08Nov2017 4 p.m. 48.06 4.98 59.00 140.00 08Nov2017 5 p.m. 47.88 3.47 58.25 115.25 08Nov2017 6 p.m. 41.90 0.00 73.00 0.00 08Nov2017 7 p.m. 40.64 3.58 78.00 0.00 08Nov2017 8 p.m. 39.92 2.24 79.50 0.00 08Nov2017 9 p.m. 38.90 1.42 80.67 0.00 08Nov2017 10 p.m. 37.40 3.65 84.33 0.00 08Nov2017 11 p.m. 34.88 2.46 96.00 0.00 09Nov2017 12 a.m. 34.29 0.95 96.50 0.00 09Nov2017 1 a.m. 33.17 0.73 97.00 0.00 09Nov2017 2 a.m. 33.08 1.79 98.25 0.00 09Nov2017 3 a.m. 32.30 0.75 98.67 0.00 09Nov2017 4 a.m. 31.82 0.67 99.00 0.00 09Nov2017 5 a.m. 31.55 0.11 99.00 0.00 09Nov2017 6 a.m. 31.19 1.40 98.75 0.00 09Nov2017 7 a.m. 31.01 0.45 99.00 2.00 Accuml. Values 932.24 105.71 1995.58 1245.58 Num. Valid Values 24 23 24 24 Avg. Values 38.84 4.60 83.15 51.90 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.80 177.48 83.15 107.09 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1685 definition: xcompl = 1 - (RELH_avg/100) TdC = 1.1998 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 = 0.4622 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5378 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.0342 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 = 1.3619 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2267 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.025 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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