Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 03Dec2017 8 a.m. 7.78 3.00 72.00 16.00 03Dec2017 9 a.m. 13.33 7.00 53.00 73.00 03Dec2017 10 a.m. 20.56 14.00 31.00 285.00 03Dec2017 11 a.m. 24.44 18.00 24.00 434.00 03Dec2017 12 p.m. 25.56 21.00 20.00 494.00 03Dec2017 1 p.m. 26.67 19.00 18.00 496.00 03Dec2017 2 p.m. 26.67 18.00 18.00 455.00 03Dec2017 3 p.m. 26.67 21.00 16.00 362.00 03Dec2017 4 p.m. 25.56 18.00 18.00 222.00 03Dec2017 5 p.m. 22.78 12.00 23.00 64.00 03Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 03Dec2017 7 p.m. 8.33 11.00 27.00 0.00 03Dec2017 8 p.m. 17.22 11.00 49.00 0.00 03Dec2017 9 p.m. 16.11 11.00 48.00 0.00 03Dec2017 10 p.m. 16.11 16.00 48.00 0.00 03Dec2017 11 p.m. 15.56 14.00 43.00 0.00 04Dec2017 12 a.m. 13.89 10.00 41.00 0.00 04Dec2017 1 a.m. 13.33 13.00 50.00 0.00 04Dec2017 2 a.m. 11.67 13.00 56.00 0.00 04Dec2017 3 a.m. 10.56 11.00 54.00 0.00 04Dec2017 4 a.m. 10.56 12.00 48.00 0.00 04Dec2017 5 a.m. 10.00 5.00 49.00 0.00 04Dec2017 6 a.m. 10.56 9.00 48.00 0.00 04Dec2017 7 a.m. 11.11 11.00 46.00 1.00 Accuml. Values 385.00 298.00 900.00 2902.00 Num. Valid Values 23 23 23 23 Avg. Values 16.74 12.96 39.13 126.17 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.48 500.33 39.13 260.36 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.6087 definition: xcompl = 1 - (RELH_avg/100) TdC = -20.0396 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 = 0.2777 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7223 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1553 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 = 1.9916 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.4305 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.110 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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