Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 04Mar2018 8 a.m. 46.27 14.70 67.97 11.80 04Mar2018 9 a.m. 49.80 17.30 62.30 75.80 04Mar2018 10 a.m. 53.24 19.50 56.13 196.80 04Mar2018 11 a.m. 56.52 20.40 53.42 226.60 04Mar2018 12 p.m. 60.35 23.80 51.44 556.40 04Mar2018 1 p.m. 63.57 24.60 51.31 677.70 04Mar2018 2 p.m. 65.30 24.30 52.16 543.30 04Mar2018 3 p.m. 63.30 25.10 55.18 218.40 04Mar2018 4 p.m. 61.56 27.30 56.66 229.50 04Mar2018 5 p.m. 58.23 28.60 63.40 128.60 04Mar2018 6 p.m. 57.09 25.00 66.01 21.30 04Mar2018 7 p.m. 51.55 24.80 33.06 0.10 04Mar2018 8 p.m. 55.20 23.20 71.13 0.00 04Mar2018 9 p.m. 54.75 23.70 73.86 0.00 04Mar2018 10 p.m. 54.32 21.70 77.65 0.00 04Mar2018 11 p.m. 53.91 18.60 84.87 0.00 05Mar2018 12 a.m. 52.39 19.70 98.94 0.00 05Mar2018 1 a.m. 51.76 20.50 100.22 0.00 05Mar2018 2 a.m. 52.39 20.10 100.22 0.00 05Mar2018 3 a.m. 52.41 18.00 100.22 0.00 05Mar2018 4 a.m. 53.62 17.90 100.22 0.00 05Mar2018 5 a.m. 54.52 16.30 100.22 0.00 05Mar2018 6 a.m. 55.04 16.30 100.22 0.00 05Mar2018 7 a.m. 48.02 30.40 94.46 0.00 Accuml. Values 1325.12 521.80 1771.27 2886.30 Num. Valid Values 24 24 24 24 Avg. Values 55.21 21.74 73.80 120.26 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 12.90 839.58 73.80 248.16 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2620 definition: xcompl = 1 - (RELH_avg/100) TdC = 8.3870 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 = 0.5962 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4038 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.7778 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 = 3.8649 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 9.3811 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.191 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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