Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 15.17 17.28 76.25 3.50 31Dec2017 9 a.m. 15.38 17.00 72.00 48.67 31Dec2017 10 a.m. 15.49 19.91 63.75 127.50 31Dec2017 11 a.m. 15.68 17.22 61.33 194.00 31Dec2017 12 p.m. 18.32 15.88 54.50 419.25 31Dec2017 1 p.m. 20.54 16.40 44.00 551.67 31Dec2017 2 p.m. 21.70 16.11 38.00 520.25 31Dec2017 3 p.m. 21.61 17.06 34.50 381.25 31Dec2017 4 p.m. 21.47 15.10 33.50 290.00 31Dec2017 5 p.m. 19.72 14.93 34.25 71.75 31Dec2017 6 p.m. 17.60 13.42 39.00 0.00 31Dec2017 7 p.m. 16.16 13.87 41.00 0.00 31Dec2017 8 p.m. 15.44 16.11 47.00 0.00 31Dec2017 9 p.m. 14.54 13.31 50.50 0.00 31Dec2017 10 p.m. 13.22 13.20 52.33 0.00 31Dec2017 11 p.m. 12.16 11.80 53.75 0.00 01Jan2018 12 a.m. 11.66 10.23 55.00 0.00 01Jan2018 1 a.m. 10.94 10.74 56.00 0.00 01Jan2018 2 a.m. 10.00 9.73 58.75 0.00 01Jan2018 3 a.m. 9.08 10.96 60.00 0.00 01Jan2018 4 a.m. 7.97 12.08 62.25 0.00 01Jan2018 5 a.m. 7.34 11.97 63.00 0.00 01Jan2018 6 a.m. 6.71 12.14 64.50 0.00 01Jan2018 7 a.m. 5.90 11.18 69.50 0.00 Accuml. Values 343.80 337.63 1284.66 2607.84 Num. Valid Values 24 24 24 24 Avg. Values 14.32 14.07 53.53 108.66 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -9.82 543.25 53.53 224.22 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4647 definition: xcompl = 1 - (RELH_avg/100) TdC = -17.5037 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 = 0.2593 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7407 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.8016 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 = 1.3632 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.6209 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.085 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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