Detailed Weather Data for Project: BIRC

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 11.14 9.53 56.06 3.93 31Dec2017 9 a.m. 10.94 9.95 54.33 65.47 31Dec2017 10 a.m. 11.79 10.47 53.04 262.00 31Dec2017 11 a.m. 12.45 10.50 47.86 438.32 31Dec2017 12 p.m. 14.41 10.72 39.04 581.80 31Dec2017 1 p.m. 16.07 10.23 33.50 557.88 31Dec2017 2 p.m. 17.13 10.65 30.53 482.79 31Dec2017 3 p.m. 17.08 12.03 30.18 421.75 31Dec2017 4 p.m. 16.57 12.67 37.13 290.49 31Dec2017 5 p.m. 15.30 11.06 40.03 86.21 31Dec2017 6 p.m. 13.82 10.08 42.27 4.52 31Dec2017 7 p.m. 11.14 2.41 43.82 0.11 31Dec2017 8 p.m. 11.93 8.95 45.64 0.12 31Dec2017 9 p.m. 11.17 10.47 46.15 0.12 31Dec2017 10 p.m. 9.75 9.71 49.12 0.12 31Dec2017 11 p.m. 8.55 9.01 51.88 0.13 01Jan2018 12 a.m. 7.39 7.20 55.24 0.12 01Jan2018 1 a.m. 6.19 6.93 57.46 0.13 01Jan2018 2 a.m. 5.05 6.89 59.98 0.12 01Jan2018 3 a.m. 4.01 6.64 62.29 0.12 01Jan2018 4 a.m. 2.97 5.81 63.86 0.12 01Jan2018 5 a.m. 2.17 5.51 66.48 0.11 01Jan2018 6 a.m. 1.42 4.83 68.82 0.11 01Jan2018 7 a.m. 0.66 4.49 71.93 0.11 Accuml. Values 239.11 206.74 1206.64 3196.70 Num. Valid Values 24 24 24 24 Avg. Values 9.96 8.61 50.28 133.20 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -12.24 332.64 50.28 274.85 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4972 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.5145 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 = 0.2276 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7724 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.2076 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 = 1.2026 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.6287 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.060 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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