Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 35.33 13.48 32.00 3.25 05Dec2017 9 a.m. 35.12 12.97 33.33 21.00 05Dec2017 10 a.m. 35.51 12.30 35.00 60.00 05Dec2017 11 a.m. 36.74 13.35 33.00 117.33 05Dec2017 12 p.m. 38.43 11.58 32.00 236.25 05Dec2017 1 p.m. 41.48 11.56 28.33 484.33 05Dec2017 2 p.m. 42.71 8.67 27.00 379.50 05Dec2017 3 p.m. 42.66 6.60 27.75 240.00 05Dec2017 4 p.m. -901.00 -901.00 -901.00 -901.00 05Dec2017 5 p.m. -901.00 -901.00 -901.00 -901.00 05Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 05Dec2017 7 p.m. -901.00 -901.00 -901.00 -901.00 05Dec2017 8 p.m. 33.98 4.70 47.00 0.00 05Dec2017 9 p.m. 34.16 3.13 51.00 0.00 05Dec2017 10 p.m. 32.99 3.02 49.50 0.00 05Dec2017 11 p.m. 32.18 2.74 52.50 0.00 06Dec2017 12 a.m. 30.70 2.91 55.00 0.00 06Dec2017 1 a.m. 30.74 4.92 57.50 0.00 06Dec2017 2 a.m. 32.99 5.93 56.75 0.00 06Dec2017 3 a.m. 31.82 5.52 54.33 0.00 06Dec2017 4 a.m. 33.08 7.44 53.25 0.00 06Dec2017 5 a.m. 33.44 5.37 49.00 0.00 06Dec2017 6 a.m. 30.25 1.62 57.75 0.00 06Dec2017 7 a.m. 28.85 3.36 63.50 0.00 Accuml. Values 693.16 141.17 895.49 1541.66 Num. Valid Values 20 20 20 20 Avg. Values 34.66 7.06 44.77 77.08 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 1.48 272.57 44.77 159.06 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5523 definition: xcompl = 1 - (RELH_avg/100) TdC = -9.3200 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 = 0.4263 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5737 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.4250 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 = 3.8011 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.9198 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.096 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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