Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 29Dec2017 8 a.m. 33.35 8.00 84.50 2.25 29Dec2017 9 a.m. 33.20 8.95 88.67 27.00 29Dec2017 10 a.m. 33.80 11.07 91.50 68.75 29Dec2017 11 a.m. 34.58 11.71 92.67 60.00 29Dec2017 12 p.m. 36.14 13.48 88.00 83.75 29Dec2017 1 p.m. 38.12 12.38 82.67 106.33 29Dec2017 2 p.m. 39.92 16.66 79.25 118.00 29Dec2017 3 p.m. 40.55 11.02 78.75 77.50 29Dec2017 4 p.m. 40.95 11.24 78.75 44.75 29Dec2017 5 p.m. 41.00 7.94 80.00 22.00 29Dec2017 6 p.m. 40.82 5.59 81.00 0.00 29Dec2017 7 p.m. 40.82 3.36 83.00 0.00 29Dec2017 8 p.m. 40.82 3.69 83.50 0.00 29Dec2017 9 p.m. 40.76 1.86 84.00 0.00 29Dec2017 10 p.m. 40.34 3.36 85.33 0.00 29Dec2017 11 p.m. 39.56 3.58 87.00 0.00 30Dec2017 12 a.m. 38.16 3.52 88.25 0.00 30Dec2017 1 a.m. 36.00 3.08 92.50 0.00 30Dec2017 2 a.m. 37.26 4.47 92.50 0.00 30Dec2017 3 a.m. 37.34 4.32 92.00 0.00 30Dec2017 4 a.m. 35.15 13.31 89.25 0.00 30Dec2017 5 a.m. 32.36 14.43 87.50 0.00 30Dec2017 6 a.m. 30.20 15.71 86.25 0.00 30Dec2017 7 a.m. 27.23 15.77 86.50 0.00 Accuml. Values 888.43 208.50 2063.34 610.33 Num. Valid Values 24 24 24 24 Avg. Values 37.02 8.69 85.97 25.43 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.79 335.48 85.97 52.48 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1403 definition: xcompl = 1 - (RELH_avg/100) TdC = 0.6580 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 = 0.4466 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5534 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.5556 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 = 1.0612 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.4677 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.022 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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