Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 07Nov2017 8 a.m. 43.65 10.12 82.75 24.25 07Nov2017 9 a.m. 44.24 10.44 80.33 72.00 07Nov2017 10 a.m. 44.60 11.02 77.75 111.50 07Nov2017 11 a.m. 45.08 10.14 79.67 120.33 07Nov2017 12 p.m. 44.69 11.80 82.75 103.50 07Nov2017 1 p.m. 43.82 12.60 89.00 72.00 07Nov2017 2 p.m. 44.19 13.76 84.75 109.50 07Nov2017 3 p.m. 45.32 14.93 74.75 158.50 07Nov2017 4 p.m. 45.36 14.15 72.25 93.25 07Nov2017 5 p.m. 45.54 12.25 69.50 40.00 07Nov2017 6 p.m. 44.60 14.99 73.00 0.00 07Nov2017 7 p.m. 44.06 14.99 76.00 0.00 07Nov2017 8 p.m. 44.15 12.64 72.00 0.00 07Nov2017 9 p.m. 44.30 13.57 66.67 0.00 07Nov2017 10 p.m. 43.11 12.58 64.25 0.00 07Nov2017 11 p.m. 42.30 11.86 69.50 0.00 08Nov2017 12 a.m. 41.85 11.07 73.50 0.00 08Nov2017 1 a.m. 41.81 12.25 76.00 0.00 08Nov2017 2 a.m. 41.67 10.74 77.00 0.00 08Nov2017 3 a.m. 41.60 12.30 76.33 0.00 08Nov2017 4 a.m. 41.36 9.73 78.00 0.00 08Nov2017 5 a.m. 40.28 9.62 86.00 0.00 08Nov2017 6 a.m. 39.51 7.66 93.25 0.00 08Nov2017 7 a.m. 39.65 7.83 91.50 0.50 Accuml. Values 1036.74 283.04 1866.50 905.33 Num. Valid Values 24 24 24 24 Avg. Values 43.20 11.79 77.77 37.72 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 6.22 455.41 77.77 77.84 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2223 definition: xcompl = 1 - (RELH_avg/100) TdC = 2.6481 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 = 0.4991 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5009 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.2841 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 = 2.1099 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.3580 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.061 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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