Detailed Weather Data for Project: WAUR

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. -901.00 -901.00 -901.00 -901.00 31Dec2017 9 a.m. -901.00 -901.00 -901.00 -901.00 31Dec2017 10 a.m. 20.88 20.18 95.10 45.00 31Dec2017 11 a.m. 20.98 19.09 81.92 145.00 31Dec2017 12 p.m. 20.98 20.84 74.53 161.00 31Dec2017 1 p.m. 20.66 18.87 74.35 216.00 31Dec2017 2 p.m. 20.32 22.60 71.05 225.00 31Dec2017 3 p.m. 21.09 18.65 62.57 179.00 31Dec2017 4 p.m. 23.18 16.46 59.88 138.00 31Dec2017 5 p.m. 24.06 18.87 57.14 67.00 31Dec2017 6 p.m. 23.61 15.80 60.31 11.00 31Dec2017 7 p.m. 21.20 10.53 53.23 0.00 31Dec2017 8 p.m. 21.31 16.24 56.77 0.00 31Dec2017 9 p.m. 20.32 17.55 58.42 0.00 31Dec2017 10 p.m. -901.00 -901.00 -901.00 -901.00 31Dec2017 11 p.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 12 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 1 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 2 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 3 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 4 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 5 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 6 a.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 7 a.m. -901.00 -901.00 -901.00 -901.00 Accuml. Values 258.59 215.68 805.27 1187.00 Num. Valid Values 12 12 12 12 Avg. Values 21.55 17.97 67.11 98.92 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -5.81 694.06 67.11 204.12 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3289 definition: xcompl = 1 - (RELH_avg/100) TdC = -10.9037 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 = 0.3159 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6841 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.6965 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 = 1.3106 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.0865 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.092 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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