Detailed Weather Data for Project: ROBE

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 48.49 8.50 58.62 16.00 02Dec2017 9 a.m. 52.11 8.90 51.23 177.00 02Dec2017 10 a.m. 55.29 3.57 47.69 353.00 02Dec2017 11 a.m. 59.90 4.45 45.12 466.00 02Dec2017 12 p.m. 63.77 2.04 45.98 561.00 02Dec2017 1 p.m. 66.61 1.72 44.46 567.00 02Dec2017 2 p.m. 67.60 2.10 45.12 499.00 02Dec2017 3 p.m. 69.69 2.79 43.23 375.00 02Dec2017 4 p.m. 68.81 2.33 47.33 244.00 02Dec2017 5 p.m. 64.96 1.35 51.72 55.00 02Dec2017 6 p.m. 62.78 1.80 54.71 1.00 02Dec2017 7 p.m. 63.88 7.00 68.70 0.00 02Dec2017 8 p.m. 60.89 3.03 57.21 0.00 02Dec2017 9 p.m. 60.24 2.82 59.72 0.00 02Dec2017 10 p.m. 59.81 2.44 61.25 0.00 02Dec2017 11 p.m. 59.36 3.84 61.86 0.00 03Dec2017 12 a.m. 55.98 2.74 70.78 0.00 03Dec2017 1 a.m. 54.10 0.99 77.20 0.00 03Dec2017 2 a.m. 53.55 1.08 78.78 0.00 03Dec2017 3 a.m. 54.54 1.27 75.00 0.00 03Dec2017 4 a.m. 54.43 0.94 74.39 0.00 03Dec2017 5 a.m. 54.00 1.26 76.78 0.00 03Dec2017 6 a.m. 53.24 0.56 78.92 0.00 03Dec2017 7 a.m. 53.24 0.60 79.89 0.00 Accuml. Values 1417.26 68.12 1455.69 3314.00 Num. Valid Values 24 24 24 24 Avg. Values 59.05 2.84 60.65 138.08 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 15.03 109.61 60.65 284.94 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3935 definition: xcompl = 1 - (RELH_avg/100) TdC = 7.5531 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 = 0.6250 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.3750 definition: del_lambda2 = 1 - del_lambda1 Qn = 2.3484 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 = 6.6827 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.9258 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.116 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.