Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 06Dec2017 8 a.m. -2.78 3.00 69.00 41.00 06Dec2017 9 a.m. 1.67 2.00 44.00 192.00 06Dec2017 10 a.m. 4.44 5.00 36.00 338.00 06Dec2017 11 a.m. 7.78 14.00 25.00 451.00 06Dec2017 12 p.m. 8.89 13.00 23.00 512.00 06Dec2017 1 p.m. 9.44 10.00 23.00 516.00 06Dec2017 2 p.m. 9.44 13.00 23.00 463.00 06Dec2017 3 p.m. 8.89 11.00 24.00 357.00 06Dec2017 4 p.m. 7.78 12.00 25.00 215.00 06Dec2017 5 p.m. 5.56 3.00 30.00 58.00 06Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 06Dec2017 7 p.m. 0.00 3.00 42.00 1.00 06Dec2017 8 p.m. 0.56 3.00 59.00 0.00 06Dec2017 9 p.m. -0.56 2.00 56.00 0.00 06Dec2017 10 p.m. -1.11 1.00 49.00 0.00 06Dec2017 11 p.m. -2.22 2.00 45.00 0.00 07Dec2017 12 a.m. -1.11 10.00 50.00 0.00 07Dec2017 1 a.m. -3.33 5.00 57.00 0.00 07Dec2017 2 a.m. -3.33 6.00 71.00 0.00 07Dec2017 3 a.m. -4.44 7.00 61.00 0.00 07Dec2017 4 a.m. -6.11 4.00 72.00 0.00 07Dec2017 5 a.m. -6.67 6.00 75.00 0.00 07Dec2017 6 a.m. -8.33 4.00 79.00 0.00 07Dec2017 7 a.m. -8.33 6.00 79.00 0.00 Accuml. Values 16.11 145.00 1117.00 3144.00 Num. Valid Values 22 23 23 23 Avg. Values 0.73 6.30 48.57 136.70 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -17.37 243.45 48.57 282.07 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5143 definition: xcompl = 1 - (RELH_avg/100) TdC = -25.6681 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 = 0.1677 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8323 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1930 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 = 0.8116 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9370 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.039 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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