Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 06Dec2017 8 a.m. 28.58 4.25 64.50 6.25 06Dec2017 9 a.m. 31.52 6.26 62.00 121.67 06Dec2017 10 a.m. 39.15 9.39 47.75 344.25 06Dec2017 11 a.m. 45.80 9.39 34.33 461.67 06Dec2017 12 p.m. 50.45 11.24 30.75 551.75 06Dec2017 1 p.m. 51.50 10.07 30.67 564.67 06Dec2017 2 p.m. 52.65 12.08 30.25 519.00 06Dec2017 3 p.m. 53.46 12.25 28.00 419.50 06Dec2017 4 p.m. 53.10 11.18 28.00 268.50 06Dec2017 5 p.m. 51.12 12.08 25.25 96.50 06Dec2017 6 p.m. 45.68 8.28 34.00 0.00 06Dec2017 7 p.m. 42.62 6.93 38.00 0.00 06Dec2017 8 p.m. 40.91 4.14 41.00 0.00 06Dec2017 9 p.m. 36.68 2.09 49.33 0.00 06Dec2017 10 p.m. 34.34 2.74 57.75 0.00 06Dec2017 11 p.m. 33.93 2.40 61.50 0.00 07Dec2017 12 a.m. 33.44 4.31 61.00 0.00 07Dec2017 1 a.m. 31.60 5.93 64.00 0.00 07Dec2017 2 a.m. 34.52 14.88 59.00 0.00 07Dec2017 3 a.m. 33.50 15.51 64.00 0.00 07Dec2017 4 a.m. 31.78 12.25 70.25 0.00 07Dec2017 5 a.m. 30.56 14.32 71.50 0.00 07Dec2017 6 a.m. 28.81 15.94 64.75 0.00 07Dec2017 7 a.m. 25.79 16.11 60.00 0.00 Accuml. Values 941.49 224.02 1177.58 3353.76 Num. Valid Values 24 24 24 24 Avg. Values 39.23 9.33 49.07 139.74 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 4.02 360.45 49.07 288.36 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5093 definition: xcompl = 1 - (RELH_avg/100) TdC = -5.7645 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 = 0.4655 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5345 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.8480 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 = 4.1861 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.1656 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.143 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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