Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. 13.96 0.39 68.74 4.00 02Jan2018 9 a.m. 15.60 1.00 51.22 41.00 02Jan2018 10 a.m. 16.48 0.37 49.51 118.00 02Jan2018 11 a.m. 18.01 0.98 47.50 194.00 02Jan2018 12 p.m. 19.35 1.42 41.88 292.00 02Jan2018 1 p.m. 20.55 1.57 39.93 269.00 02Jan2018 2 p.m. 21.20 1.18 37.48 233.00 02Jan2018 3 p.m. 21.76 1.34 33.58 170.00 02Jan2018 4 p.m. 21.88 1.24 33.64 90.00 02Jan2018 5 p.m. 21.87 1.16 33.27 30.00 02Jan2018 6 p.m. 21.87 0.39 33.70 2.00 02Jan2018 7 p.m. 28.80 0.22 53.61 0.00 02Jan2018 8 p.m. 21.65 0.32 37.00 0.00 02Jan2018 9 p.m. 20.66 0.41 44.20 0.00 02Jan2018 10 p.m. 19.24 0.39 47.13 0.00 02Jan2018 11 p.m. 18.57 0.37 54.82 0.00 03Jan2018 12 a.m. 20.23 2.72 48.54 0.00 03Jan2018 1 a.m. 19.67 4.62 49.51 0.00 03Jan2018 2 a.m. 18.25 4.72 55.98 0.00 03Jan2018 3 a.m. 17.58 4.37 58.85 0.00 03Jan2018 4 a.m. 16.38 1.92 57.63 0.00 03Jan2018 5 a.m. 14.40 0.36 69.29 0.00 03Jan2018 6 a.m. 14.72 1.58 73.75 0.00 03Jan2018 7 a.m. 10.78 0.20 75.40 0.00 Accuml. Values 453.45 33.24 1196.16 1443.00 Num. Valid Values 24 24 24 24 Avg. Values 18.89 1.39 49.84 60.13 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -7.28 53.48 49.84 124.07 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5016 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.0179 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 = 0.2946 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7054 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.0280 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 = 1.7977 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9636 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.026 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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