Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 04Nov2017 8 a.m. 48.29 4.03 100.00 2.00 04Nov2017 9 a.m. 48.74 5.65 100.00 65.75 04Nov2017 10 a.m. 52.40 6.93 98.67 292.67 04Nov2017 11 a.m. 58.10 8.05 89.50 409.00 04Nov2017 12 p.m. 66.44 8.72 77.33 541.00 04Nov2017 1 p.m. 74.75 10.29 61.75 647.75 04Nov2017 2 p.m. 79.10 11.04 52.33 638.67 04Nov2017 3 p.m. 81.81 13.03 47.25 573.00 04Nov2017 4 p.m. 84.20 11.74 42.75 460.00 04Nov2017 5 p.m. 84.42 12.81 40.50 313.00 04Nov2017 6 p.m. 82.85 8.89 41.25 108.50 04Nov2017 7 p.m. 77.54 4.70 50.00 0.00 04Nov2017 8 p.m. 73.94 6.04 62.00 0.00 04Nov2017 9 p.m. 73.40 6.38 64.00 0.00 04Nov2017 10 p.m. 72.02 6.86 68.67 0.00 04Nov2017 11 p.m. 70.02 7.61 74.00 0.00 05Nov2017 12 a.m. 69.71 7.89 77.00 0.00 05Nov2017 1 a.m. 69.35 7.10 80.50 0.00 05Nov2017 2 a.m. 68.04 6.88 84.75 0.00 05Nov2017 3 a.m. 67.40 8.05 87.00 0.00 05Nov2017 4 a.m. 67.50 8.50 87.50 0.00 05Nov2017 5 a.m. 66.47 8.28 86.50 0.00 05Nov2017 6 a.m. 65.43 8.16 84.75 0.00 05Nov2017 7 a.m. 64.58 9.28 83.00 2.50 Accuml. Values 1666.50 196.91 1741.00 4053.84 Num. Valid Values 24 24 24 24 Avg. Values 69.44 8.20 72.54 168.91 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 20.80 316.83 72.54 348.55 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2746 definition: xcompl = 1 - (RELH_avg/100) TdC = 15.7690 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 = 0.6959 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3041 definition: del_lambda2 = 1 - del_lambda1 Qn = 3.5924 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 = 6.6425 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 7.0855 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.183 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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