Detailed Weather Data for Project: COUN

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. -4.77 2.30 63.33 0.50 01Jan2018 9 a.m. -3.21 1.20 62.72 90.10 01Jan2018 10 a.m. -0.74 1.00 56.71 243.50 01Jan2018 11 a.m. 1.65 2.10 53.22 370.70 01Jan2018 12 p.m. 5.29 1.20 49.96 452.80 01Jan2018 1 p.m. 8.55 1.00 45.88 480.50 01Jan2018 2 p.m. 10.56 1.50 42.74 443.50 01Jan2018 3 p.m. 13.37 1.10 40.41 372.50 01Jan2018 4 p.m. 13.71 2.70 37.20 226.00 01Jan2018 5 p.m. 12.99 4.10 36.62 97.90 01Jan2018 6 p.m. 11.91 4.30 38.67 0.00 01Jan2018 7 p.m. 18.32 5.30 37.58 0.00 01Jan2018 8 p.m. 9.81 3.40 41.70 0.00 01Jan2018 9 p.m. 9.00 2.80 46.13 0.00 01Jan2018 10 p.m. 7.93 2.60 49.02 0.00 01Jan2018 11 p.m. 6.89 2.20 51.80 0.00 02Jan2018 12 a.m. 6.01 2.60 55.66 0.00 02Jan2018 1 a.m. 5.63 1.70 55.52 0.00 02Jan2018 2 a.m. 5.13 0.80 60.14 0.00 02Jan2018 3 a.m. 4.15 1.20 63.87 0.00 02Jan2018 4 a.m. 3.47 1.40 65.52 0.00 02Jan2018 5 a.m. 2.68 1.80 67.89 0.00 02Jan2018 6 a.m. 2.16 1.90 67.74 0.00 02Jan2018 7 a.m. 1.81 0.80 68.06 0.00 Accuml. Values 152.29 51.00 1258.09 2778.00 Num. Valid Values 24 24 24 24 Avg. Values 6.35 2.13 52.42 115.75 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -14.25 82.06 52.42 238.85 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4758 definition: xcompl = 1 - (RELH_avg/100) TdC = -21.8921 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 = 0.2029 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7971 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.8608 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 = 0.9751 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.6435 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.027 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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