Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. -8.89 8.00 93.00 3.00 30Dec2017 9 a.m. -8.89 7.00 87.00 31.00 30Dec2017 10 a.m. -8.89 6.00 85.00 72.00 30Dec2017 11 a.m. -8.33 5.00 83.00 118.00 30Dec2017 12 p.m. -7.78 5.00 76.00 183.00 30Dec2017 1 p.m. -6.67 3.00 72.00 220.00 30Dec2017 2 p.m. -6.67 3.00 69.00 216.00 30Dec2017 3 p.m. -5.56 3.00 65.00 161.00 30Dec2017 4 p.m. -5.56 4.00 65.00 172.00 30Dec2017 5 p.m. -6.11 6.00 70.00 41.00 30Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 30Dec2017 7 p.m. -8.89 7.00 48.00 1.00 30Dec2017 8 p.m. -5.00 8.00 89.00 0.00 30Dec2017 9 p.m. -5.56 7.00 94.00 0.00 30Dec2017 10 p.m. -5.56 6.00 96.00 0.00 30Dec2017 11 p.m. -5.56 7.00 97.00 0.00 31Dec2017 12 a.m. -6.11 9.00 98.00 0.00 31Dec2017 1 a.m. -7.78 11.00 96.00 0.00 31Dec2017 2 a.m. -10.00 10.00 90.00 0.00 31Dec2017 3 a.m. -10.00 7.00 91.00 0.00 31Dec2017 4 a.m. -10.56 10.00 92.00 0.00 31Dec2017 5 a.m. -10.56 13.00 90.00 0.00 31Dec2017 6 a.m. -11.11 10.00 85.00 0.00 31Dec2017 7 a.m. -11.11 9.00 82.00 0.00 Accuml. Values -181.11 164.00 1913.00 1218.00 Num. Valid Values 23 23 23 23 Avg. Values -7.87 7.13 83.17 52.96 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -22.15 275.35 83.17 109.28 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1683 definition: xcompl = 1 - (RELH_avg/100) TdC = -24.2371 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 = 0.1218 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8782 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 = 0.1756 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.2637 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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