Detailed Weather Data for Project: PATM

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 9 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 10 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 11 a.m. 19.04 -901.00 44.84 590.00 01Jan2018 12 p.m. 21.13 7.26 39.52 645.00 01Jan2018 1 p.m. 23.54 6.61 33.90 656.00 01Jan2018 2 p.m. 24.53 8.55 32.01 600.00 01Jan2018 3 p.m. 26.08 7.98 30.60 478.00 01Jan2018 4 p.m. 25.97 7.50 30.17 303.00 01Jan2018 5 p.m. 25.41 6.99 31.94 101.00 01Jan2018 6 p.m. 23.11 5.11 35.79 -2.00 01Jan2018 7 p.m. 21.99 4.98 39.09 -2.00 01Jan2018 8 p.m. 20.46 2.63 45.56 -3.00 01Jan2018 9 p.m. 20.14 5.68 45.08 -3.00 01Jan2018 10 p.m. 19.04 4.01 48.98 -3.00 01Jan2018 11 p.m. 18.27 3.55 55.77 -2.00 02Jan2018 12 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 1 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 2 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 3 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 4 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 5 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 6 a.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 7 a.m. -901.00 -901.00 -901.00 -901.00 Accuml. Values 288.70 70.85 513.25 3358.00 Num. Valid Values 13 12 13 13 Avg. Values 22.21 5.90 39.48 258.31 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -5.44 228.00 39.48 533.02 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.6052 definition: xcompl = 1 - (RELH_avg/100) TdC = -17.1912 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 = 0.3213 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6787 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.1056 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 = 2.5038 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.4248 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.117 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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