Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 05Dec2017 8 a.m. 0.56 4.00 39.00 21.00 05Dec2017 9 a.m. 1.11 4.00 38.00 88.00 05Dec2017 10 a.m. 3.89 7.00 28.00 223.00 05Dec2017 11 a.m. 3.89 5.00 28.00 198.00 05Dec2017 12 p.m. 4.44 5.00 27.00 239.00 05Dec2017 1 p.m. 5.00 4.00 27.00 260.00 05Dec2017 2 p.m. 5.56 7.00 27.00 238.00 05Dec2017 3 p.m. 6.11 8.00 25.00 238.00 05Dec2017 4 p.m. 6.11 9.00 24.00 160.00 05Dec2017 5 p.m. 5.00 6.00 26.00 51.00 05Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 05Dec2017 7 p.m. 3.33 3.00 32.00 1.00 05Dec2017 8 p.m. 0.56 7.00 37.00 0.00 05Dec2017 9 p.m. -1.11 5.00 43.00 0.00 05Dec2017 10 p.m. -2.78 6.00 48.00 0.00 05Dec2017 11 p.m. -3.33 3.00 51.00 0.00 06Dec2017 12 a.m. -2.78 4.00 61.00 0.00 06Dec2017 1 a.m. -3.89 3.00 80.00 0.00 06Dec2017 2 a.m. -4.44 4.00 79.00 0.00 06Dec2017 3 a.m. -5.56 2.00 83.00 0.00 06Dec2017 4 a.m. -5.56 4.00 75.00 0.00 06Dec2017 5 a.m. -6.11 4.00 81.00 0.00 06Dec2017 6 a.m. -5.56 3.00 87.00 0.00 06Dec2017 7 a.m. -5.56 1.00 78.00 0.00 Accuml. Values -1.11 108.00 1124.00 1717.00 Num. Valid Values 23 23 23 23 Avg. Values -0.05 4.70 48.87 74.65 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -17.80 181.33 48.87 154.05 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5113 definition: xcompl = 1 - (RELH_avg/100) TdC = -25.9990 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 = 0.1632 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8368 definition: del_lambda2 = 1 - del_lambda1 Qn = -1.#IND 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 = 0.7773 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.7577 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: -1.#IO inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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