Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 29Dec2017 8 a.m. -2.78 6.00 92.00 12.00 29Dec2017 9 a.m. 0.00 7.00 83.00 131.00 29Dec2017 10 a.m. 4.44 8.00 63.00 314.00 29Dec2017 11 a.m. 8.33 8.00 41.00 429.00 29Dec2017 12 p.m. 13.33 11.00 25.00 494.00 29Dec2017 1 p.m. 17.22 10.00 18.00 504.00 29Dec2017 2 p.m. 18.89 6.00 15.00 441.00 29Dec2017 3 p.m. 21.67 2.00 13.00 348.00 29Dec2017 4 p.m. 22.22 1.00 12.00 277.00 29Dec2017 5 p.m. 16.11 6.00 16.00 78.00 29Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 29Dec2017 7 p.m. -6.11 5.00 68.00 1.00 29Dec2017 8 p.m. 7.22 5.00 36.00 0.00 29Dec2017 9 p.m. 6.11 5.00 43.00 0.00 29Dec2017 10 p.m. 3.33 5.00 51.00 0.00 29Dec2017 11 p.m. 1.67 6.00 65.00 0.00 30Dec2017 12 a.m. -2.22 7.00 73.00 0.00 30Dec2017 1 a.m. -5.56 10.00 79.00 0.00 30Dec2017 2 a.m. -7.22 10.00 80.00 0.00 30Dec2017 3 a.m. -7.78 12.00 84.00 0.00 30Dec2017 4 a.m. -8.33 10.00 86.00 0.00 30Dec2017 5 a.m. -8.33 7.00 88.00 0.00 30Dec2017 6 a.m. -8.33 6.00 90.00 0.00 30Dec2017 7 a.m. -8.33 6.00 89.00 0.00 Accuml. Values 75.56 159.00 1310.00 3029.00 Num. Valid Values 22 23 23 23 Avg. Values 3.43 6.91 56.96 131.70 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -15.87 266.95 56.96 271.76 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4304 definition: xcompl = 1 - (RELH_avg/100) TdC = -22.4412 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 = 0.1842 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8158 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.1223 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 = 0.7692 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9480 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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