Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 05Mar2018 8 a.m. 49.73 22.31 45.75 105.00 05Mar2018 9 a.m. 51.56 23.49 43.67 306.33 05Mar2018 10 a.m. 53.42 21.31 39.50 518.50 05Mar2018 11 a.m. 54.86 24.23 34.67 684.00 05Mar2018 12 p.m. 57.65 23.54 26.25 792.75 05Mar2018 1 p.m. 59.48 22.74 20.33 785.33 05Mar2018 2 p.m. 60.84 23.71 14.75 793.00 05Mar2018 3 p.m. 60.12 18.90 14.25 525.50 05Mar2018 4 p.m. 60.84 17.62 13.00 478.25 05Mar2018 5 p.m. 61.11 13.53 12.75 333.00 05Mar2018 6 p.m. 57.92 12.97 12.00 72.00 05Mar2018 7 p.m. 51.44 6.93 20.00 0.00 05Mar2018 8 p.m. 47.12 2.24 27.00 0.00 05Mar2018 9 p.m. 45.50 1.01 33.50 0.00 05Mar2018 10 p.m. 42.50 2.61 41.67 0.00 05Mar2018 11 p.m. 40.05 3.02 49.50 0.00 06Mar2018 12 a.m. 38.25 2.91 55.50 0.00 06Mar2018 1 a.m. 38.48 2.68 49.25 0.00 06Mar2018 2 a.m. 36.99 2.63 50.75 0.00 06Mar2018 3 a.m. 36.26 4.62 55.67 0.00 06Mar2018 4 a.m. 35.51 5.59 57.50 0.00 06Mar2018 5 a.m. 35.69 3.91 52.50 0.00 06Mar2018 6 a.m. 34.52 7.05 53.00 0.00 06Mar2018 7 a.m. 33.53 7.16 57.00 4.50 Accuml. Values 1143.37 276.71 879.76 5398.16 Num. Valid Values 24 24 24 24 Avg. Values 47.64 11.53 36.66 224.92 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 8.69 445.23 36.66 464.13 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.6334 definition: xcompl = 1 - (RELH_avg/100) TdC = -5.4513 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 = 0.5360 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4640 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.2604 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 = 7.1952 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 9.7160 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.267 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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