Detailed Weather Data for Project: PENS

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 16.21 16.13 81.94 1.85 31Dec2017 9 a.m. 15.71 14.79 81.26 27.68 31Dec2017 10 a.m. 15.91 16.20 79.29 195.78 31Dec2017 11 a.m. 16.48 15.36 73.25 395.19 31Dec2017 12 p.m. 17.96 14.33 64.37 494.57 31Dec2017 1 p.m. 19.11 15.70 58.91 532.28 31Dec2017 2 p.m. 20.23 15.78 55.74 457.70 31Dec2017 3 p.m. 20.35 18.00 57.30 307.66 31Dec2017 4 p.m. 20.66 17.45 58.24 248.13 31Dec2017 5 p.m. 20.41 16.33 61.45 81.16 31Dec2017 6 p.m. 19.56 15.27 64.46 0.00 31Dec2017 7 p.m. 16.92 11.27 62.07 0.00 31Dec2017 8 p.m. 17.91 15.75 70.01 0.00 31Dec2017 9 p.m. 17.29 17.79 72.54 0.00 31Dec2017 10 p.m. 16.43 16.78 74.62 0.00 31Dec2017 11 p.m. 15.44 17.17 78.18 0.00 01Jan2018 12 a.m. 14.23 15.23 79.17 0.00 01Jan2018 1 a.m. 13.05 14.41 81.83 0.00 01Jan2018 2 a.m. 11.95 13.75 85.26 0.00 01Jan2018 3 a.m. 10.87 13.78 87.66 0.00 01Jan2018 4 a.m. 9.50 13.86 89.37 0.00 01Jan2018 5 a.m. 8.74 12.77 88.84 0.00 01Jan2018 6 a.m. 8.04 11.35 88.35 0.00 01Jan2018 7 a.m. 7.27 10.14 87.89 0.00 Accuml. Values 370.24 359.39 1782.00 2742.00 Num. Valid Values 24 24 24 24 Avg. Values 15.43 14.97 74.25 114.25 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -9.21 578.26 74.25 235.76 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2575 definition: xcompl = 1 - (RELH_avg/100) TdC = -12.9305 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 = 0.2677 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7323 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9158 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 = 0.7894 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.7031 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.059 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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