Detailed Weather Data for Project: CHOU

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 14.74 11.70 70.33 0.50 31Dec2017 9 a.m. 14.31 13.20 64.33 32.90 31Dec2017 10 a.m. 15.10 11.60 60.46 215.80 31Dec2017 11 a.m. 16.20 12.90 53.78 398.70 31Dec2017 12 p.m. 17.76 12.30 47.20 516.90 31Dec2017 1 p.m. 19.08 13.90 40.75 559.60 31Dec2017 2 p.m. 20.03 13.50 37.56 532.60 31Dec2017 3 p.m. 20.84 12.90 34.28 452.00 31Dec2017 4 p.m. 20.80 13.20 35.09 295.10 31Dec2017 5 p.m. 18.86 11.30 36.43 116.90 31Dec2017 6 p.m. 17.17 10.30 43.38 0.00 31Dec2017 7 p.m. 14.09 5.40 52.92 0.00 31Dec2017 8 p.m. 14.99 9.40 51.36 0.00 31Dec2017 9 p.m. 14.25 9.80 53.38 0.00 31Dec2017 10 p.m. 13.73 8.80 55.08 0.00 31Dec2017 11 p.m. 12.69 8.20 58.38 0.00 01Jan2018 12 a.m. 11.68 7.80 59.77 0.00 01Jan2018 1 a.m. 10.33 9.00 61.94 0.00 01Jan2018 2 a.m. 9.48 9.30 63.86 0.00 01Jan2018 3 a.m. 8.33 9.60 65.59 0.00 01Jan2018 4 a.m. 7.34 9.60 68.08 0.00 01Jan2018 5 a.m. 6.26 9.90 69.68 0.00 01Jan2018 6 a.m. 5.34 9.30 72.00 0.00 01Jan2018 7 a.m. 4.35 8.80 74.53 0.00 Accuml. Values 327.74 251.70 1330.16 3121.00 Num. Valid Values 24 24 24 24 Avg. Values 13.66 10.49 55.42 130.04 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -10.19 404.99 55.42 268.34 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4458 definition: xcompl = 1 - (RELH_avg/100) TdC = -17.4283 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 = 0.2543 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7457 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1904 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 = 1.2685 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9656 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.070 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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