Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 29Dec2017 8 a.m. 27.00 2.24 69.93 0.00 29Dec2017 9 a.m. 28.51 5.08 68.48 6.61 29Dec2017 10 a.m. 30.20 8.83 70.42 48.29 29Dec2017 11 a.m. 33.04 12.82 65.33 107.30 29Dec2017 12 p.m. 35.40 17.23 68.49 132.67 29Dec2017 1 p.m. 36.43 15.86 67.50 187.64 29Dec2017 2 p.m. 38.23 11.31 66.38 191.82 29Dec2017 3 p.m. 40.84 10.49 63.60 282.18 29Dec2017 4 p.m. 40.98 3.98 66.41 120.02 29Dec2017 5 p.m. 40.44 3.53 70.69 9.56 29Dec2017 6 p.m. 39.81 4.57 73.51 0.00 29Dec2017 7 p.m. 19.78 4.66 45.74 0.00 29Dec2017 8 p.m. 38.89 0.91 75.02 0.00 29Dec2017 9 p.m. 38.52 0.90 75.82 0.00 29Dec2017 10 p.m. 38.39 2.11 76.59 0.00 29Dec2017 11 p.m. 38.14 1.36 76.90 0.00 30Dec2017 12 a.m. 37.81 2.02 77.02 0.00 30Dec2017 1 a.m. 37.67 4.71 75.68 0.00 30Dec2017 2 a.m. 32.67 8.27 79.45 0.00 30Dec2017 3 a.m. 26.78 8.13 85.05 0.00 30Dec2017 4 a.m. 24.39 7.39 85.45 0.00 30Dec2017 5 a.m. 22.57 7.02 83.17 0.00 30Dec2017 6 a.m. 20.70 7.74 75.71 0.00 30Dec2017 7 a.m. 19.49 9.85 71.07 0.00 Accuml. Values 786.67 161.01 1733.41 1086.09 Num. Valid Values 24 24 24 24 Avg. Values 32.78 6.71 72.23 45.25 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 0.43 259.07 72.23 93.38 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2777 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.9588 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 = 0.4102 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5898 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.2079 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 = 1.7543 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9208 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.041 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.