Detailed Weather Data for Project: PENS

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 35.83 11.41 50.51 0.00 05Dec2017 9 a.m. 36.00 9.98 48.80 5.19 05Dec2017 10 a.m. 36.16 7.54 46.75 37.06 05Dec2017 11 a.m. 36.63 8.69 45.87 122.84 05Dec2017 12 p.m. 38.26 6.85 41.60 341.14 05Dec2017 1 p.m. 40.32 6.94 36.21 313.82 05Dec2017 2 p.m. 43.25 5.61 29.70 480.77 05Dec2017 3 p.m. 44.56 5.92 24.45 290.69 05Dec2017 4 p.m. 45.43 4.03 23.18 191.02 05Dec2017 5 p.m. 44.15 3.20 24.27 31.90 05Dec2017 6 p.m. 41.79 1.30 30.08 0.00 05Dec2017 7 p.m. 47.26 6.76 40.94 0.00 05Dec2017 8 p.m. 38.44 0.93 41.07 0.00 05Dec2017 9 p.m. 37.29 1.59 46.36 0.00 05Dec2017 10 p.m. 36.68 1.20 48.91 0.00 05Dec2017 11 p.m. 35.80 1.44 54.90 0.00 06Dec2017 12 a.m. 35.04 1.72 57.08 0.00 06Dec2017 1 a.m. 35.31 1.43 55.42 0.00 06Dec2017 2 a.m. 34.16 1.69 63.85 0.00 06Dec2017 3 a.m. 34.34 2.19 59.82 0.00 06Dec2017 4 a.m. 35.76 2.57 54.16 0.00 06Dec2017 5 a.m. 35.98 2.74 50.34 0.00 06Dec2017 6 a.m. 34.81 2.31 52.92 0.00 06Dec2017 7 a.m. 34.16 1.70 58.73 0.00 Accuml. Values 917.42 99.74 1085.92 1814.43 Num. Valid Values 24 24 24 24 Avg. Values 38.23 4.16 45.25 75.60 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.46 160.48 45.25 156.00 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5475 definition: xcompl = 1 - (RELH_avg/100) TdC = -7.3673 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 = 0.4569 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5431 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.4382 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 = 4.3354 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.2191 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.077 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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