Detailed Weather Data for Project: HUDS

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 5.00 8.60 75.96 0.00 01Jan2018 9 a.m. 4.86 7.10 76.26 21.90 01Jan2018 10 a.m. 5.97 6.70 75.59 126.50 01Jan2018 11 a.m. 8.29 5.60 73.06 178.50 01Jan2018 12 p.m. 10.53 4.90 65.10 28.00 01Jan2018 1 p.m. 12.52 3.30 58.40 19.00 01Jan2018 2 p.m. 14.47 4.00 53.15 11.10 01Jan2018 3 p.m. 16.09 5.40 49.97 7.40 01Jan2018 4 p.m. 17.24 5.90 47.74 5.50 01Jan2018 5 p.m. 18.10 5.80 48.80 2.90 01Jan2018 6 p.m. 17.89 6.40 49.55 0.00 01Jan2018 7 p.m. 22.41 0.40 49.62 0.00 01Jan2018 8 p.m. 14.68 3.70 52.33 0.00 01Jan2018 9 p.m. 15.89 5.10 56.63 0.00 01Jan2018 10 p.m. 16.66 9.20 59.13 0.00 01Jan2018 11 p.m. 16.18 8.70 58.41 0.00 02Jan2018 12 a.m. 16.56 7.80 58.67 0.00 02Jan2018 1 a.m. 16.70 6.30 57.93 0.00 02Jan2018 2 a.m. 16.57 6.00 59.43 0.00 02Jan2018 3 a.m. 16.30 4.80 60.29 0.00 02Jan2018 4 a.m. 16.05 4.40 60.44 0.00 02Jan2018 5 a.m. 16.32 4.30 61.33 0.00 02Jan2018 6 a.m. 16.21 3.00 61.39 0.00 02Jan2018 7 a.m. 16.12 2.70 56.06 0.00 Accuml. Values 347.63 130.10 1425.24 400.80 Num. Valid Values 24 24 24 24 Avg. Values 14.48 5.42 59.38 16.70 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -9.73 209.33 59.38 34.46 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4062 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.1534 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 = 0.2605 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7395 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.7611 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 = 1.1965 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2027 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.027 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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