Detailed Weather Data for Project: BIRC

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 0.12 3.78 72.77 11.32 01Jan2018 9 a.m. 1.24 5.43 68.71 145.61 01Jan2018 10 a.m. 3.18 6.04 61.22 330.68 01Jan2018 11 a.m. 5.90 5.41 53.48 471.63 01Jan2018 12 p.m. 8.44 5.41 46.83 559.90 01Jan2018 1 p.m. 10.51 4.95 42.33 585.69 01Jan2018 2 p.m. 12.74 4.14 38.08 543.67 01Jan2018 3 p.m. 13.93 4.95 35.24 428.25 01Jan2018 4 p.m. 14.74 5.26 34.30 301.15 01Jan2018 5 p.m. 14.61 4.58 34.65 106.45 01Jan2018 6 p.m. 12.72 4.83 38.88 3.44 01Jan2018 7 p.m. 21.99 3.39 40.10 0.10 01Jan2018 8 p.m. 10.22 2.36 48.24 0.11 01Jan2018 9 p.m. 10.38 4.45 47.53 0.11 01Jan2018 10 p.m. 10.83 3.48 46.77 0.11 01Jan2018 11 p.m. 11.82 4.46 45.25 0.11 02Jan2018 12 a.m. 12.02 5.09 44.44 0.11 02Jan2018 1 a.m. 11.48 4.49 47.06 0.11 02Jan2018 2 a.m. 11.25 3.89 47.63 0.11 02Jan2018 3 a.m. 10.83 3.46 48.63 0.11 02Jan2018 4 a.m. 10.87 3.62 50.21 0.11 02Jan2018 5 a.m. 10.78 4.91 50.27 0.11 02Jan2018 6 a.m. 10.94 4.56 50.08 0.11 02Jan2018 7 a.m. 11.16 2.72 51.95 0.11 Accuml. Values 252.70 105.66 1144.65 3489.21 Num. Valid Values 24 24 24 24 Avg. Values 10.53 4.40 47.69 145.38 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -11.93 170.01 47.69 300.00 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5231 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.8487 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 = 0.2316 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7684 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.4411 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 = 1.2988 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.1492 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.048 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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