Detailed Weather Data for Project: GSAL

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. -1.43 2.50 78.77 0.00 01Jan2018 9 a.m. -0.87 4.90 75.39 64.10 01Jan2018 10 a.m. 2.44 7.30 60.68 306.30 01Jan2018 11 a.m. 5.76 5.40 51.70 461.60 01Jan2018 12 p.m. 8.29 4.70 46.71 562.30 01Jan2018 1 p.m. 11.57 2.70 40.66 605.50 01Jan2018 2 p.m. 13.66 3.20 36.32 575.70 01Jan2018 3 p.m. 15.26 4.30 34.71 464.40 01Jan2018 4 p.m. 16.34 3.50 32.93 310.10 01Jan2018 5 p.m. 15.44 4.30 33.65 99.90 01Jan2018 6 p.m. 13.75 2.00 35.72 2.70 01Jan2018 7 p.m. 18.82 4.70 38.03 0.00 01Jan2018 8 p.m. 10.94 1.50 41.44 0.00 01Jan2018 9 p.m. 10.08 1.60 48.77 0.00 01Jan2018 10 p.m. 11.10 0.80 47.43 0.00 01Jan2018 11 p.m. 11.89 1.40 45.16 0.00 02Jan2018 12 a.m. 12.20 2.50 46.42 0.00 02Jan2018 1 a.m. 11.77 2.70 47.20 0.00 02Jan2018 2 a.m. 10.71 3.30 49.29 0.00 02Jan2018 3 a.m. 10.33 2.10 50.85 0.00 02Jan2018 4 a.m. 10.94 2.50 50.29 0.00 02Jan2018 5 a.m. 11.23 2.50 50.41 0.00 02Jan2018 6 a.m. 11.23 1.70 51.50 0.00 02Jan2018 7 a.m. 11.23 2.20 51.60 0.00 Accuml. Values 252.68 74.30 1145.63 3452.60 Num. Valid Values 24 24 24 24 Avg. Values 10.53 3.10 47.73 143.86 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -11.93 119.55 47.73 296.85 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5227 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.8389 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 = 1.4124 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 = 1.2978 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9644 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.042 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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