Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. -16.11 1.00 68.00 10.00 02Jan2018 9 a.m. -11.67 2.00 55.00 115.00 02Jan2018 10 a.m. -8.33 4.00 46.00 291.00 02Jan2018 11 a.m. -7.22 7.00 45.00 415.00 02Jan2018 12 p.m. -4.44 4.00 39.00 488.00 02Jan2018 1 p.m. -2.22 4.00 35.00 510.00 02Jan2018 2 p.m. -0.56 4.00 33.00 473.00 02Jan2018 3 p.m. 1.11 6.00 31.00 382.00 02Jan2018 4 p.m. 1.11 7.00 31.00 250.00 02Jan2018 5 p.m. -1.11 4.00 35.00 89.00 02Jan2018 6 p.m. -901.00 -901.00 -901.00 -901.00 02Jan2018 7 p.m. 5.56 7.00 26.00 2.00 02Jan2018 8 p.m. -5.56 3.00 64.00 0.00 02Jan2018 9 p.m. -6.67 6.00 63.00 0.00 02Jan2018 10 p.m. -8.33 7.00 74.00 0.00 02Jan2018 11 p.m. -7.78 8.00 76.00 0.00 03Jan2018 12 a.m. -6.11 10.00 62.00 0.00 03Jan2018 1 a.m. -5.00 11.00 56.00 0.00 03Jan2018 2 a.m. -5.00 8.00 52.00 0.00 03Jan2018 3 a.m. -3.33 9.00 44.00 0.00 03Jan2018 4 a.m. -3.89 8.00 43.00 0.00 03Jan2018 5 a.m. -3.89 6.00 43.00 0.00 03Jan2018 6 a.m. -5.00 7.00 44.00 0.00 03Jan2018 7 a.m. -6.11 6.00 45.00 0.00 Accuml. Values -110.56 139.00 1110.00 3025.00 Num. Valid Values 23 23 23 23 Avg. Values -4.81 6.04 48.26 131.52 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -20.45 233.37 48.26 271.40 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5174 definition: xcompl = 1 - (RELH_avg/100) TdC = -28.5847 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 = 0.1371 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8629 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 = 0.6245 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.7248 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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