Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 45.27 2.96 93.50 16.00 02Dec2017 9 a.m. 49.58 2.68 86.33 160.00 02Dec2017 10 a.m. 56.57 3.80 73.50 319.75 02Dec2017 11 a.m. 59.72 1.34 67.33 425.33 02Dec2017 12 p.m. 62.96 2.18 61.75 524.00 02Dec2017 1 p.m. 66.32 4.03 57.33 526.00 02Dec2017 2 p.m. 69.26 2.35 51.75 485.75 02Dec2017 3 p.m. 69.89 2.85 51.25 337.25 02Dec2017 4 p.m. 70.07 2.13 50.25 220.25 02Dec2017 5 p.m. 68.90 1.68 52.75 92.50 02Dec2017 6 p.m. 60.62 4.92 67.00 0.00 02Dec2017 7 p.m. 58.46 7.16 74.00 0.00 02Dec2017 8 p.m. 52.34 4.25 82.00 0.00 02Dec2017 9 p.m. 53.15 2.91 85.00 0.00 02Dec2017 10 p.m. 51.02 2.24 89.00 0.00 02Dec2017 11 p.m. 48.42 2.63 90.75 0.00 03Dec2017 12 a.m. 50.18 2.52 91.75 0.00 03Dec2017 1 a.m. 49.55 2.24 93.50 0.00 03Dec2017 2 a.m. 50.63 3.91 94.00 0.00 03Dec2017 3 a.m. 48.98 3.80 95.00 0.00 03Dec2017 4 a.m. 49.46 2.24 96.00 0.00 03Dec2017 5 a.m. 50.81 3.47 94.00 0.00 03Dec2017 6 a.m. 50.18 2.35 91.75 0.00 03Dec2017 7 a.m. 47.93 2.68 97.00 0.00 Accuml. Values 1340.27 73.32 1886.49 3106.83 Num. Valid Values 24 24 24 24 Avg. Values 55.84 3.06 78.60 129.45 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.25 117.97 78.60 267.13 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2140 definition: xcompl = 1 - (RELH_avg/100) TdC = 9.6400 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 = 0.6010 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3990 definition: del_lambda2 = 1 - del_lambda1 Qn = 2.0287 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 = 3.2361 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.1421 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.082 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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