Detailed Weather Data for Project: COPA

Date Time TAIR WSPD RELH SRAD 29Dec2017 8 a.m. 24.03 2.79 85.72 0.00 29Dec2017 9 a.m. 27.36 2.62 81.07 1.71 29Dec2017 10 a.m. 29.43 7.63 75.43 43.35 29Dec2017 11 a.m. 32.36 9.40 65.08 77.19 29Dec2017 12 p.m. 34.54 10.15 63.85 117.29 29Dec2017 1 p.m. 37.58 7.01 62.68 136.15 29Dec2017 2 p.m. 40.24 6.37 57.73 199.56 29Dec2017 3 p.m. 42.01 6.19 54.90 270.43 29Dec2017 4 p.m. 41.13 5.50 59.54 100.30 29Dec2017 5 p.m. 39.76 4.55 65.68 5.46 29Dec2017 6 p.m. 39.11 2.97 68.89 0.00 29Dec2017 7 p.m. 19.80 4.55 49.78 0.00 29Dec2017 8 p.m. 38.30 1.14 73.44 0.00 29Dec2017 9 p.m. 37.69 2.78 78.25 0.00 29Dec2017 10 p.m. 37.29 2.27 79.48 0.00 29Dec2017 11 p.m. 37.00 0.76 80.85 0.00 30Dec2017 12 a.m. 36.72 1.30 85.22 0.00 30Dec2017 1 a.m. 36.75 2.74 81.73 0.00 30Dec2017 2 a.m. 36.73 5.76 79.52 0.00 30Dec2017 3 a.m. 31.62 15.07 81.81 0.00 30Dec2017 4 a.m. 25.68 15.28 88.33 0.00 30Dec2017 5 a.m. 23.07 13.75 91.60 0.00 30Dec2017 6 a.m. 21.54 12.41 89.32 0.00 30Dec2017 7 a.m. 19.81 13.47 82.93 0.00 Accuml. Values 789.55 156.46 1782.83 951.44 Num. Valid Values 24 24 24 24 Avg. Values 32.90 6.52 74.28 39.64 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 0.50 251.74 74.28 81.80 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2572 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.5243 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 = 0.4112 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5888 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.3115 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 = 1.6329 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.7707 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.036 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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