Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. -5.66 12.90 72.19 3.30 01Jan2018 9 a.m. -5.08 9.30 70.60 133.80 01Jan2018 10 a.m. -3.19 9.70 65.76 312.80 01Jan2018 11 a.m. -0.62 8.20 63.06 455.40 01Jan2018 12 p.m. 2.66 6.80 57.12 542.60 01Jan2018 1 p.m. 5.76 5.80 50.23 563.10 01Jan2018 2 p.m. 8.51 5.20 45.12 521.30 01Jan2018 3 p.m. 10.76 5.00 40.49 412.50 01Jan2018 4 p.m. 12.43 5.20 36.38 257.50 01Jan2018 5 p.m. 12.49 4.90 33.02 75.90 01Jan2018 6 p.m. 10.92 4.20 36.84 0.00 01Jan2018 7 p.m. 15.57 5.20 43.59 0.00 01Jan2018 8 p.m. 10.02 5.10 41.12 0.00 01Jan2018 9 p.m. 9.54 4.30 43.55 0.00 01Jan2018 10 p.m. 8.67 4.20 46.95 0.00 01Jan2018 11 p.m. 7.84 4.30 50.25 0.00 02Jan2018 12 a.m. 7.66 4.40 53.07 0.00 02Jan2018 1 a.m. 7.65 4.60 52.97 0.00 02Jan2018 2 a.m. 7.09 3.50 55.60 0.00 02Jan2018 3 a.m. 6.30 2.80 61.83 0.00 02Jan2018 4 a.m. 5.77 3.60 62.20 0.00 02Jan2018 5 a.m. 5.29 4.80 63.93 0.00 02Jan2018 6 a.m. 4.42 4.30 67.06 0.00 02Jan2018 7 a.m. 4.28 3.40 68.94 0.00 Accuml. Values 149.09 131.70 1281.87 3278.20 Num. Valid Values 24 24 24 24 Avg. Values 6.21 5.49 53.41 136.59 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -14.33 211.91 53.41 281.86 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4659 definition: xcompl = 1 - (RELH_avg/100) TdC = -21.7421 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 = 0.2020 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7980 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.2327 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 = 0.9485 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9875 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.041 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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