Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 29Dec2017 8 a.m. 27.18 8.70 58.43 0.00 29Dec2017 9 a.m. 27.52 9.10 60.53 5.50 29Dec2017 10 a.m. 28.15 9.20 60.19 68.90 29Dec2017 11 a.m. 29.62 9.10 58.01 126.00 29Dec2017 12 p.m. 31.42 10.40 59.88 181.50 29Dec2017 1 p.m. 33.82 9.30 57.74 286.30 29Dec2017 2 p.m. 38.91 8.50 51.27 230.90 29Dec2017 3 p.m. 42.93 3.90 46.97 121.70 29Dec2017 4 p.m. 42.31 4.30 50.38 95.90 29Dec2017 5 p.m. 41.38 3.60 57.29 52.50 29Dec2017 6 p.m. 40.01 1.70 60.43 0.00 29Dec2017 7 p.m. 25.38 5.10 73.60 0.00 29Dec2017 8 p.m. 38.37 0.40 68.09 0.00 29Dec2017 9 p.m. 37.98 1.30 71.09 0.00 29Dec2017 10 p.m. 37.80 0.80 75.21 0.00 29Dec2017 11 p.m. 37.69 1.10 77.40 0.00 30Dec2017 12 a.m. 37.54 1.60 76.88 0.00 30Dec2017 1 a.m. 37.27 0.60 77.93 0.00 30Dec2017 2 a.m. 37.15 1.10 80.56 0.00 30Dec2017 3 a.m. 37.62 1.90 80.94 0.00 30Dec2017 4 a.m. 37.53 3.70 83.34 0.00 30Dec2017 5 a.m. 37.53 5.50 79.44 0.00 30Dec2017 6 a.m. 37.69 4.10 76.41 0.00 30Dec2017 7 a.m. 37.31 6.40 76.31 0.00 Accuml. Values 860.09 111.40 1618.32 1169.20 Num. Valid Values 24 24 24 24 Avg. Values 35.84 4.64 67.43 48.72 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.13 179.24 67.43 100.53 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3257 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.2360 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 = 0.4364 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5636 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.1207 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 = 2.3225 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9727 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.042 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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