Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. 13.19 5.48 61.50 3.00 02Jan2018 9 a.m. 13.76 4.32 62.00 30.67 02Jan2018 10 a.m. 14.72 3.80 61.25 81.75 02Jan2018 11 a.m. 15.80 2.01 59.33 112.00 02Jan2018 12 p.m. 17.56 1.90 54.00 158.00 02Jan2018 1 p.m. 18.80 3.58 52.33 215.00 02Jan2018 2 p.m. 19.99 6.54 48.50 189.00 02Jan2018 3 p.m. 20.57 4.14 47.00 144.00 02Jan2018 4 p.m. 20.71 2.18 47.00 96.00 02Jan2018 5 p.m. 20.89 3.52 47.25 50.00 02Jan2018 6 p.m. 20.12 4.03 50.00 0.00 02Jan2018 7 p.m. 19.58 3.80 50.00 0.00 02Jan2018 8 p.m. 16.52 5.37 56.00 0.00 02Jan2018 9 p.m. 16.52 4.59 59.50 0.00 02Jan2018 10 p.m. 16.40 4.40 59.67 0.00 02Jan2018 11 p.m. 15.71 4.25 60.50 0.00 03Jan2018 12 a.m. 14.86 5.59 64.50 0.00 03Jan2018 1 a.m. 13.82 5.65 68.00 0.00 03Jan2018 2 a.m. 14.27 6.15 65.25 0.00 03Jan2018 3 a.m. 13.70 4.85 65.33 0.00 03Jan2018 4 a.m. 14.90 6.21 64.25 0.00 03Jan2018 5 a.m. 15.08 7.05 64.50 0.00 03Jan2018 6 a.m. 15.04 7.89 66.75 0.00 03Jan2018 7 a.m. 15.71 6.38 65.50 0.00 Accuml. Values 398.22 113.68 1399.91 1079.42 Num. Valid Values 24 24 24 24 Avg. Values 16.59 4.74 58.33 44.98 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.56 182.91 58.33 92.81 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4167 definition: xcompl = 1 - (RELH_avg/100) TdC = -15.2674 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 = 0.2766 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7234 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.2973 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 = 1.3467 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2351 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.032 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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