Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. -11.11 7.00 79.00 9.00 31Dec2017 9 a.m. -11.11 8.00 77.00 68.00 31Dec2017 10 a.m. -10.00 7.00 74.00 134.00 31Dec2017 11 a.m. -8.89 7.00 66.00 249.00 31Dec2017 12 p.m. -8.33 9.00 54.00 397.00 31Dec2017 1 p.m. -6.11 8.00 47.00 434.00 31Dec2017 2 p.m. -6.11 6.00 45.00 347.00 31Dec2017 3 p.m. -6.67 7.00 45.00 208.00 31Dec2017 4 p.m. -7.22 8.00 44.00 161.00 31Dec2017 5 p.m. -8.33 8.00 47.00 57.00 31Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 31Dec2017 7 p.m. -7.78 7.00 39.00 1.00 31Dec2017 8 p.m. -10.56 7.00 49.00 0.00 31Dec2017 9 p.m. -11.11 4.00 50.00 0.00 31Dec2017 10 p.m. -11.67 6.00 47.00 0.00 31Dec2017 11 p.m. -11.67 5.00 47.00 0.00 01Jan2018 12 a.m. -12.22 5.00 46.00 0.00 01Jan2018 1 a.m. -12.78 4.00 45.00 0.00 01Jan2018 2 a.m. -12.78 4.00 46.00 0.00 01Jan2018 3 a.m. -13.33 5.00 48.00 0.00 01Jan2018 4 a.m. -13.33 4.00 49.00 0.00 01Jan2018 5 a.m. -14.44 5.00 50.00 0.00 01Jan2018 6 a.m. -15.00 4.00 54.00 0.00 01Jan2018 7 a.m. -16.11 3.00 58.00 0.00 Accuml. Values -246.67 138.00 1206.00 2065.00 Num. Valid Values 23 23 23 23 Avg. Values -10.72 6.00 52.43 89.78 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -23.74 231.70 52.43 185.27 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4757 definition: xcompl = 1 - (RELH_avg/100) TdC = -30.7380 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 = 0.1087 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8913 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 = 0.4264 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.5157 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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