Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. 15.49 5.50 48.73 0.00 02Jan2018 9 a.m. 15.71 5.80 48.17 27.90 02Jan2018 10 a.m. 16.68 6.20 46.60 109.20 02Jan2018 11 a.m. 17.71 6.40 45.37 192.30 02Jan2018 12 p.m. 19.90 4.10 40.95 450.50 02Jan2018 1 p.m. 21.00 2.50 37.42 317.80 02Jan2018 2 p.m. 21.70 1.90 33.97 259.30 02Jan2018 3 p.m. 22.80 5.00 33.18 272.50 02Jan2018 4 p.m. 23.13 5.20 35.16 128.70 02Jan2018 5 p.m. 22.93 4.70 39.21 31.90 02Jan2018 6 p.m. 22.42 3.90 39.92 0.00 02Jan2018 7 p.m. 27.73 0.70 58.55 0.00 02Jan2018 8 p.m. 22.32 1.00 43.46 0.00 02Jan2018 9 p.m. 21.74 2.10 45.55 0.00 02Jan2018 10 p.m. 19.94 1.60 47.39 0.00 02Jan2018 11 p.m. 16.25 1.00 57.93 0.00 03Jan2018 12 a.m. 19.98 3.70 49.74 0.00 03Jan2018 1 a.m. 19.02 5.80 53.82 0.00 03Jan2018 2 a.m. 18.25 3.40 57.62 0.00 03Jan2018 3 a.m. 16.90 2.80 61.09 0.00 03Jan2018 4 a.m. 12.45 1.20 72.07 0.00 03Jan2018 5 a.m. 10.85 1.30 76.11 0.00 03Jan2018 6 a.m. 10.81 1.50 80.92 0.00 03Jan2018 7 a.m. 9.95 0.40 83.17 0.00 Accuml. Values 445.67 77.70 1236.10 1790.10 Num. Valid Values 24 24 24 24 Avg. Values 18.57 3.24 51.50 74.59 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -7.46 125.02 51.50 153.91 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4850 definition: xcompl = 1 - (RELH_avg/100) TdC = -15.7782 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 = 0.2920 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7080 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.2240 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 = 1.7128 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2565 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.038 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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