Detailed Weather Data for Project: CHEN

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. -1.86 2.25 72.32 5.00 02Jan2018 9 a.m. 2.88 3.13 73.48 141.00 02Jan2018 10 a.m. 10.24 5.51 57.47 318.00 02Jan2018 11 a.m. 12.65 5.49 47.27 364.00 02Jan2018 12 p.m. 14.63 6.33 42.75 388.00 02Jan2018 1 p.m. 16.72 6.98 40.31 286.00 02Jan2018 2 p.m. 17.82 9.44 39.45 219.00 02Jan2018 3 p.m. 19.80 5.06 39.88 362.00 02Jan2018 4 p.m. 23.52 6.96 34.56 262.00 02Jan2018 5 p.m. 23.20 7.70 32.79 74.00 02Jan2018 6 p.m. 20.01 6.02 35.72 1.00 02Jan2018 7 p.m. 23.74 1.56 56.54 0.00 02Jan2018 8 p.m. 16.29 6.45 43.36 0.00 02Jan2018 9 p.m. 17.26 7.31 43.66 0.00 02Jan2018 10 p.m. 16.93 9.85 44.15 0.00 02Jan2018 11 p.m. 18.48 10.71 46.17 0.00 03Jan2018 12 a.m. 17.71 11.53 48.42 0.00 03Jan2018 1 a.m. 16.93 8.83 52.15 0.00 03Jan2018 2 a.m. 17.04 8.07 55.32 0.00 03Jan2018 3 a.m. 17.71 9.21 60.45 0.00 03Jan2018 4 a.m. 20.23 8.45 66.99 0.00 03Jan2018 5 a.m. 21.56 12.83 70.90 0.00 03Jan2018 6 a.m. 20.46 11.76 74.50 0.00 03Jan2018 7 a.m. 21.88 14.40 75.23 0.00 Accuml. Values 405.82 185.83 1253.84 2420.00 Num. Valid Values 24 24 24 24 Avg. Values 16.91 7.74 52.24 100.83 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.38 299.00 52.24 208.07 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4776 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.4612 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 = 0.2791 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7209 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.6836 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 = 1.5694 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9136 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.062 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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