Detailed Weather Data for Project: PENS

Date Time TAIR WSPD RELH SRAD 03Mar2018 8 a.m. 48.94 1.78 57.35 93.00 03Mar2018 9 a.m. 52.25 2.72 51.59 277.89 03Mar2018 10 a.m. 56.19 2.78 47.04 453.21 03Mar2018 11 a.m. 60.17 3.73 43.04 579.21 03Mar2018 12 p.m. 62.62 3.51 40.33 679.73 03Mar2018 1 p.m. 65.44 3.75 37.26 737.36 03Mar2018 2 p.m. 67.10 3.73 36.13 686.12 03Mar2018 3 p.m. 68.36 3.99 35.64 589.38 03Mar2018 4 p.m. 68.59 3.72 36.20 430.74 03Mar2018 5 p.m. 68.43 3.30 35.36 267.82 03Mar2018 6 p.m. 66.43 3.29 37.62 73.32 03Mar2018 7 p.m. 57.13 3.14 62.94 0.00 03Mar2018 8 p.m. 60.78 1.93 44.63 0.00 03Mar2018 9 p.m. 58.71 2.03 46.13 0.00 03Mar2018 10 p.m. 57.09 2.15 45.89 0.00 03Mar2018 11 p.m. 55.92 1.72 45.96 0.00 04Mar2018 12 a.m. 54.97 2.07 45.58 0.00 04Mar2018 1 a.m. 55.85 3.40 42.53 0.00 04Mar2018 2 a.m. 55.62 2.02 43.20 0.00 04Mar2018 3 a.m. 56.57 2.84 42.70 0.00 04Mar2018 4 a.m. 56.68 2.78 43.34 0.00 04Mar2018 5 a.m. 57.11 2.66 42.76 0.00 04Mar2018 6 a.m. 56.64 2.11 44.03 0.00 04Mar2018 7 a.m. 56.70 1.82 45.62 0.00 Accuml. Values 1424.30 66.97 1052.87 4867.78 Num. Valid Values 24 24 24 24 Avg. Values 59.35 2.79 43.87 202.82 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 15.19 107.75 43.87 418.53 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5613 definition: xcompl = 1 - (RELH_avg/100) TdC = 2.9165 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 = 0.6271 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3729 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.1528 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 = 9.7418 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.4300 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.182 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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