Detailed Weather Data for Project: THUN

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 66.47 13.87 84.50 9.00 04Dec2017 9 a.m. 67.70 17.00 81.00 37.00 04Dec2017 10 a.m. 69.26 18.45 76.00 152.25 04Dec2017 11 a.m. 71.18 22.22 69.67 334.33 04Dec2017 12 p.m. 72.45 18.79 63.50 448.00 04Dec2017 1 p.m. 74.60 18.04 54.67 457.00 04Dec2017 2 p.m. 74.75 17.45 49.00 334.00 04Dec2017 3 p.m. 74.43 14.54 42.25 247.50 04Dec2017 4 p.m. 73.67 12.81 38.00 191.25 04Dec2017 5 p.m. 66.06 18.23 38.50 61.50 04Dec2017 6 p.m. 61.52 19.01 23.00 0.00 04Dec2017 7 p.m. 58.64 19.24 23.00 0.00 04Dec2017 8 p.m. 57.74 21.81 25.00 0.00 04Dec2017 9 p.m. 55.70 25.35 29.67 0.00 04Dec2017 10 p.m. 52.04 22.22 37.67 0.00 04Dec2017 11 p.m. 46.22 22.15 40.00 0.00 05Dec2017 12 a.m. 44.87 23.15 38.25 0.00 05Dec2017 1 a.m. 42.71 17.39 40.00 0.00 05Dec2017 2 a.m. 41.31 16.16 35.50 0.00 05Dec2017 3 a.m. 40.22 17.52 27.33 0.00 05Dec2017 4 a.m. 39.69 15.66 23.50 0.00 05Dec2017 5 a.m. 38.30 18.34 22.00 0.00 05Dec2017 6 a.m. 37.58 15.99 24.50 0.00 05Dec2017 7 a.m. 36.50 12.30 29.50 0.00 Accuml. Values 1363.61 437.69 1016.01 2271.83 Num. Valid Values 24 24 24 24 Avg. Values 56.82 18.24 42.33 94.66 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.79 704.24 42.33 195.33 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5767 definition: xcompl = 1 - (RELH_avg/100) TdC = 1.1257 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 = 0.6084 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3916 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1754 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 = 9.1525 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 17.2781 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.295 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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