Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 03Dec2017 8 a.m. 48.02 3.80 97.00 19.75 03Dec2017 9 a.m. 51.62 5.29 88.33 122.00 03Dec2017 10 a.m. 54.00 6.99 78.75 110.25 03Dec2017 11 a.m. 57.44 7.46 79.00 201.00 03Dec2017 12 p.m. 61.43 8.56 74.25 169.50 03Dec2017 1 p.m. 64.46 9.02 70.00 257.00 03Dec2017 2 p.m. 70.70 11.63 58.75 387.25 03Dec2017 3 p.m. 74.03 16.22 55.00 383.50 03Dec2017 4 p.m. 74.34 15.04 53.25 211.25 03Dec2017 5 p.m. 73.17 12.36 52.75 82.00 03Dec2017 6 p.m. 69.80 9.17 59.00 0.00 03Dec2017 7 p.m. 67.64 9.17 64.00 0.00 03Dec2017 8 p.m. 67.10 11.18 71.00 0.00 03Dec2017 9 p.m. 65.84 12.75 80.00 0.00 03Dec2017 10 p.m. 64.94 12.30 84.00 0.00 03Dec2017 11 p.m. 64.04 13.76 87.75 0.00 04Dec2017 12 a.m. 63.95 13.70 89.25 0.00 04Dec2017 1 a.m. 64.94 14.60 88.00 0.00 04Dec2017 2 a.m. 65.48 12.81 86.00 0.00 04Dec2017 3 a.m. 65.24 13.72 86.00 0.00 04Dec2017 4 a.m. 65.57 14.04 86.00 0.00 04Dec2017 5 a.m. 65.12 12.19 87.00 0.00 04Dec2017 6 a.m. 64.98 11.91 87.50 0.00 04Dec2017 7 a.m. 65.57 13.42 86.50 0.00 Accuml. Values 1549.42 271.09 1849.08 1943.50 Num. Valid Values 24 24 24 24 Avg. Values 64.56 11.30 77.05 80.98 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 18.09 436.18 77.05 167.10 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2295 definition: xcompl = 1 - (RELH_avg/100) TdC = 14.0559 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 = 0.6639 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3361 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9860 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 = 4.7082 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 6.5871 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.113 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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