Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 22.98 6.50 92.32 1.00 31Dec2017 9 a.m. 22.10 6.16 89.14 14.00 31Dec2017 10 a.m. 20.55 7.39 81.32 46.00 31Dec2017 11 a.m. 20.88 6.69 79.12 113.00 31Dec2017 12 p.m. 20.66 7.20 76.01 136.00 31Dec2017 1 p.m. 22.53 8.33 64.42 419.00 31Dec2017 2 p.m. 23.85 7.64 57.75 447.00 31Dec2017 3 p.m. 25.05 6.94 47.31 363.00 31Dec2017 4 p.m. 25.05 8.28 38.58 312.00 31Dec2017 5 p.m. 23.63 7.57 34.99 99.00 31Dec2017 6 p.m. 21.97 6.16 36.51 5.00 31Dec2017 7 p.m. 17.91 0.39 46.40 0.00 31Dec2017 8 p.m. 19.24 6.54 36.20 0.00 31Dec2017 9 p.m. 17.92 5.30 39.57 0.00 31Dec2017 10 p.m. 16.70 4.00 43.65 0.00 31Dec2017 11 p.m. 15.60 4.84 46.70 0.00 01Jan2018 12 a.m. 14.61 4.89 50.98 0.00 01Jan2018 1 a.m. 14.18 4.48 53.61 0.00 01Jan2018 2 a.m. 13.08 3.87 56.90 0.00 01Jan2018 3 a.m. 12.31 3.54 57.52 0.00 01Jan2018 4 a.m. 11.53 4.91 58.91 0.00 01Jan2018 5 a.m. 10.89 4.69 60.44 0.00 01Jan2018 6 a.m. 10.22 3.73 60.74 0.00 01Jan2018 7 a.m. 9.46 3.62 62.16 0.00 Accuml. Values 432.91 133.66 1371.25 1955.00 Num. Valid Values 24 24 24 24 Avg. Values 18.04 5.57 57.14 81.46 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -7.76 215.06 57.14 168.09 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4286 definition: xcompl = 1 - (RELH_avg/100) TdC = -14.7667 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 = 0.2879 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7121 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.3425 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 = 1.4756 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.4698 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.045 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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