Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 03Mar2018 8 a.m. 41.67 0.28 91.04 113.00 03Mar2018 9 a.m. 51.33 0.42 57.09 327.00 03Mar2018 10 a.m. 52.75 6.68 53.73 520.00 03Mar2018 11 a.m. 57.27 4.64 46.34 674.00 03Mar2018 12 p.m. 61.54 4.17 35.35 774.00 03Mar2018 1 p.m. 64.51 5.71 39.99 808.00 03Mar2018 2 p.m. 66.70 3.96 36.87 781.00 03Mar2018 3 p.m. 67.59 5.82 35.53 689.00 03Mar2018 4 p.m. 67.80 4.78 29.85 538.00 03Mar2018 5 p.m. 67.48 3.85 33.28 347.00 03Mar2018 6 p.m. 65.07 2.11 34.13 139.00 03Mar2018 7 p.m. 54.07 4.79 70.57 4.00 03Mar2018 8 p.m. 56.70 0.36 51.04 3.00 03Mar2018 9 p.m. 52.75 0.42 54.33 3.00 03Mar2018 10 p.m. 50.02 0.39 59.90 3.00 03Mar2018 11 p.m. 52.41 0.91 52.14 3.00 04Mar2018 12 a.m. 53.08 2.07 51.04 3.00 04Mar2018 1 a.m. 54.30 1.15 46.53 3.00 04Mar2018 2 a.m. 53.62 6.44 47.74 3.00 04Mar2018 3 a.m. 53.31 5.24 48.85 3.00 04Mar2018 4 a.m. 53.51 2.59 51.16 3.00 04Mar2018 5 a.m. 53.40 1.76 49.63 3.00 04Mar2018 6 a.m. 52.75 4.39 53.05 3.00 04Mar2018 7 a.m. 52.75 2.88 53.30 4.00 Accuml. Values 1356.38 75.81 1182.48 5751.00 Num. Valid Values 24 24 24 24 Avg. Values 56.52 3.16 49.27 239.63 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 13.62 121.98 49.27 494.47 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5073 definition: xcompl = 1 - (RELH_avg/100) TdC = 3.1675 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 = 0.6061 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3939 definition: del_lambda2 = 1 - del_lambda1 Qn = 5.0900 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 = 7.9371 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 4.7895 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.196 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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