Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 03Mar2018 8 a.m. 49.01 11.41 74.25 83.00 03Mar2018 9 a.m. 51.38 12.45 69.33 223.67 03Mar2018 10 a.m. 54.27 13.98 65.75 335.50 03Mar2018 11 a.m. 57.68 13.20 63.33 544.00 03Mar2018 12 p.m. 60.66 14.48 61.00 636.00 03Mar2018 1 p.m. 63.62 15.73 59.33 798.33 03Mar2018 2 p.m. 66.96 14.76 54.00 749.75 03Mar2018 3 p.m. 67.59 15.32 52.50 542.00 03Mar2018 4 p.m. 68.90 15.38 50.75 538.25 03Mar2018 5 p.m. 68.45 14.76 50.25 323.00 03Mar2018 6 p.m. 65.48 13.65 54.00 54.00 03Mar2018 7 p.m. 62.60 12.30 59.00 0.00 03Mar2018 8 p.m. 61.43 12.19 60.50 0.00 03Mar2018 9 p.m. 60.20 13.20 61.67 0.00 03Mar2018 10 p.m. 59.12 14.24 61.67 0.00 03Mar2018 11 p.m. 59.90 13.65 57.00 0.00 04Mar2018 12 a.m. 59.67 11.18 57.75 0.00 04Mar2018 1 a.m. 59.81 10.51 57.00 0.00 04Mar2018 2 a.m. 59.63 11.41 57.00 0.00 04Mar2018 3 a.m. 59.60 10.96 58.67 0.00 04Mar2018 4 a.m. 59.31 11.58 62.75 0.00 04Mar2018 5 a.m. 59.27 11.18 62.50 0.00 04Mar2018 6 a.m. 58.91 11.86 65.25 0.00 04Mar2018 7 a.m. 58.01 15.21 72.00 0.50 Accuml. Values 1451.46 314.59 1447.25 4828.00 Num. Valid Values 24 24 24 24 Avg. Values 60.48 13.11 60.30 201.17 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 15.82 506.18 60.30 415.11 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3970 definition: xcompl = 1 - (RELH_avg/100) TdC = 8.2155 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 = 0.6353 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3647 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.1550 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 = 7.0913 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 10.5832 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.256 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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