Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 04Mar2018 8 a.m. 56.70 13.87 81.50 14.25 04Mar2018 9 a.m. 56.30 13.12 82.00 66.33 04Mar2018 10 a.m. 57.15 14.43 83.25 160.00 04Mar2018 11 a.m. 58.40 13.65 83.00 195.00 04Mar2018 12 p.m. 60.44 14.99 78.75 248.50 04Mar2018 1 p.m. 62.84 13.35 75.67 271.33 04Mar2018 2 p.m. 62.69 13.20 78.50 106.75 04Mar2018 3 p.m. 61.83 13.37 79.50 106.25 04Mar2018 4 p.m. 60.71 14.09 84.25 153.50 04Mar2018 5 p.m. 61.52 16.27 81.75 79.00 04Mar2018 6 p.m. 60.08 11.18 86.00 7.00 04Mar2018 7 p.m. 59.00 17.22 86.00 0.00 04Mar2018 8 p.m. 57.20 17.45 89.00 0.00 04Mar2018 9 p.m. 57.20 14.32 91.00 0.00 04Mar2018 10 p.m. 57.65 14.76 91.50 0.00 04Mar2018 11 p.m. 58.32 15.77 92.00 0.00 05Mar2018 12 a.m. 58.46 15.38 92.00 0.00 05Mar2018 1 a.m. 58.82 12.19 92.25 0.00 05Mar2018 2 a.m. 59.49 11.41 93.75 0.00 05Mar2018 3 a.m. 59.72 12.15 95.67 0.00 05Mar2018 4 a.m. 61.61 11.07 94.00 0.00 05Mar2018 5 a.m. 63.14 14.76 86.50 0.00 05Mar2018 6 a.m. 58.59 22.48 68.00 0.00 05Mar2018 7 a.m. 49.73 23.60 48.00 3.50 Accuml. Values 1417.59 354.08 2013.84 1411.41 Num. Valid Values 24 24 24 24 Avg. Values 59.07 14.75 83.91 58.81 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 15.04 569.71 83.91 121.35 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1609 definition: xcompl = 1 - (RELH_avg/100) TdC = 12.3462 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 = 0.6251 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3749 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.3395 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 = 2.7445 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.0381 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.083 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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