Detailed Weather Data for Project: PENS

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 6.21 9.97 87.24 0.00 01Jan2018 9 a.m. 6.31 9.15 87.12 28.05 01Jan2018 10 a.m. 7.16 6.59 87.38 105.60 01Jan2018 11 a.m. 7.77 6.37 87.62 251.39 01Jan2018 12 p.m. 9.39 5.87 88.32 305.79 01Jan2018 1 p.m. 10.76 5.43 88.92 435.25 01Jan2018 2 p.m. 12.11 4.34 89.20 483.43 01Jan2018 3 p.m. 13.93 4.63 85.41 385.94 01Jan2018 4 p.m. 15.75 5.80 75.51 245.27 01Jan2018 5 p.m. 17.22 7.95 67.71 83.12 01Jan2018 6 p.m. 17.02 10.51 63.51 0.00 01Jan2018 7 p.m. 21.45 1.13 50.19 0.00 01Jan2018 8 p.m. 16.79 10.28 64.94 0.00 01Jan2018 9 p.m. 16.52 5.37 65.96 0.00 01Jan2018 10 p.m. 15.26 3.65 56.30 0.00 01Jan2018 11 p.m. 14.94 4.75 52.89 0.00 02Jan2018 12 a.m. 15.28 5.01 54.03 0.00 02Jan2018 1 a.m. 15.12 3.65 54.91 0.00 02Jan2018 2 a.m. 14.92 3.07 57.27 0.00 02Jan2018 3 a.m. 15.28 3.20 57.47 0.00 02Jan2018 4 a.m. 14.50 3.47 56.76 0.00 02Jan2018 5 a.m. 14.81 2.20 60.96 0.00 02Jan2018 6 a.m. 15.04 2.42 60.69 0.00 02Jan2018 7 a.m. 15.01 2.39 60.86 0.00 Accuml. Values 328.55 127.20 1661.17 2323.84 Num. Valid Values 24 24 24 24 Avg. Values 13.69 5.30 69.22 96.83 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -10.17 204.66 69.22 199.80 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3078 definition: xcompl = 1 - (RELH_avg/100) TdC = -14.7127 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 = 0.2546 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7454 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.5820 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 = 0.8736 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.8999 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.032 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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