Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 24.26 16.89 90.50 1.25 30Dec2017 9 a.m. 23.18 14.02 93.00 12.00 30Dec2017 10 a.m. 21.92 14.93 93.00 32.50 30Dec2017 11 a.m. 21.20 14.54 93.00 46.67 30Dec2017 12 p.m. 20.62 14.60 93.00 69.25 30Dec2017 1 p.m. 20.42 14.54 91.33 79.00 30Dec2017 2 p.m. 20.17 12.36 91.75 75.25 30Dec2017 3 p.m. 20.17 11.46 89.50 65.25 30Dec2017 4 p.m. 20.35 11.18 87.50 49.25 30Dec2017 5 p.m. 20.17 10.85 85.25 15.75 30Dec2017 6 p.m. 19.94 9.62 85.00 0.00 30Dec2017 7 p.m. 19.94 7.16 81.00 0.00 30Dec2017 8 p.m. 19.94 7.16 79.50 0.00 30Dec2017 9 p.m. 19.70 6.11 77.33 0.00 30Dec2017 10 p.m. 19.72 5.98 77.50 0.00 30Dec2017 11 p.m. 19.99 4.64 78.75 0.00 31Dec2017 12 a.m. 20.03 5.03 84.50 0.00 31Dec2017 1 a.m. 20.12 10.90 87.00 0.00 31Dec2017 2 a.m. 19.81 13.31 86.50 0.00 31Dec2017 3 a.m. 19.76 16.70 85.00 0.00 31Dec2017 4 a.m. 19.09 18.23 82.50 0.00 31Dec2017 5 a.m. 17.60 17.45 82.00 0.00 31Dec2017 6 a.m. 16.48 16.66 84.75 0.00 31Dec2017 7 a.m. 15.53 14.99 84.50 0.00 Accuml. Values 480.11 289.31 2063.66 446.17 Num. Valid Values 24 24 24 24 Avg. Values 20.00 12.05 85.99 18.59 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -6.66 465.50 85.99 38.36 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1401 definition: xcompl = 1 - (RELH_avg/100) TdC = -8.6374 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 = 0.3034 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6966 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.7227 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 = 0.5305 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.0132 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.019 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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