Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 4.44 5.00 62.00 39.00 02Dec2017 9 a.m. 7.22 3.00 51.00 194.00 02Dec2017 10 a.m. 10.56 2.00 44.00 310.00 02Dec2017 11 a.m. 13.89 4.00 37.00 427.00 02Dec2017 12 p.m. 17.22 3.00 33.00 524.00 02Dec2017 1 p.m. 18.89 3.00 28.00 532.00 02Dec2017 2 p.m. 20.00 3.00 25.00 430.00 02Dec2017 3 p.m. 19.44 2.00 26.00 340.00 02Dec2017 4 p.m. 20.56 1.00 25.00 207.00 02Dec2017 5 p.m. 15.00 0.00 32.00 30.00 02Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 02Dec2017 7 p.m. 19.44 11.00 30.00 1.00 02Dec2017 8 p.m. 8.33 6.00 49.00 0.00 02Dec2017 9 p.m. 9.44 5.00 54.00 0.00 02Dec2017 10 p.m. 8.89 7.00 56.00 0.00 02Dec2017 11 p.m. 7.22 1.00 60.00 0.00 03Dec2017 12 a.m. 6.11 3.00 69.00 0.00 03Dec2017 1 a.m. 7.22 2.00 71.00 0.00 03Dec2017 2 a.m. 5.56 2.00 85.00 0.00 03Dec2017 3 a.m. 4.44 0.00 83.00 0.00 03Dec2017 4 a.m. 5.56 1.00 85.00 0.00 03Dec2017 5 a.m. 6.67 6.00 71.00 0.00 03Dec2017 6 a.m. 6.11 1.00 78.00 0.00 03Dec2017 7 a.m. 6.11 0.00 72.00 0.00 Accuml. Values 248.33 71.00 1226.00 3034.00 Num. Valid Values 23 20 23 23 Avg. Values 10.80 3.55 53.30 131.91 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -11.78 137.09 53.30 272.21 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4670 definition: xcompl = 1 - (RELH_avg/100) TdC = -19.3855 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 = 0.2335 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7665 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1928 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 = 1.1711 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9395 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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