Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 5.23 12.08 71.25 9.00 01Jan2018 9 a.m. 6.02 12.23 69.00 127.00 01Jan2018 10 a.m. 8.51 10.85 62.50 300.00 01Jan2018 11 a.m. 11.42 9.77 56.00 433.67 01Jan2018 12 p.m. 14.23 8.72 48.00 529.50 01Jan2018 1 p.m. 15.98 7.83 43.00 554.67 01Jan2018 2 p.m. 18.14 8.67 40.00 525.00 01Jan2018 3 p.m. 19.36 6.32 36.25 438.75 01Jan2018 4 p.m. 19.99 6.54 35.75 307.00 01Jan2018 5 p.m. 19.04 7.10 37.00 111.00 01Jan2018 6 p.m. 16.34 4.70 45.00 0.00 01Jan2018 7 p.m. 15.44 6.49 48.00 0.00 01Jan2018 8 p.m. 14.36 5.82 51.00 0.00 01Jan2018 9 p.m. 13.64 5.59 53.00 0.00 01Jan2018 10 p.m. 12.68 4.55 55.00 0.00 01Jan2018 11 p.m. 11.53 4.70 57.50 0.00 02Jan2018 12 a.m. 10.67 5.03 59.50 0.00 02Jan2018 1 a.m. 9.77 3.58 62.25 0.00 02Jan2018 2 a.m. 8.87 3.97 64.50 0.00 02Jan2018 3 a.m. 9.86 5.00 64.33 0.00 02Jan2018 4 a.m. 12.02 5.70 61.25 0.00 02Jan2018 5 a.m. 12.47 5.37 57.50 0.00 02Jan2018 6 a.m. 12.56 4.36 59.25 0.00 02Jan2018 7 a.m. 12.65 4.47 62.50 0.00 Accuml. Values 310.78 159.44 1299.33 3335.59 Num. Valid Values 24 24 24 24 Avg. Values 12.95 6.64 54.14 138.98 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -10.58 256.54 54.14 286.79 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4586 definition: xcompl = 1 - (RELH_avg/100) TdC = -18.0806 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 = 0.2491 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7509 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.3504 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 = 1.2656 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.4321 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.056 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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