Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. 4.26 1.30 68.67 3.10 02Jan2018 9 a.m. 5.65 3.80 60.13 125.50 02Jan2018 10 a.m. 7.68 5.70 53.44 258.30 02Jan2018 11 a.m. 11.68 5.60 45.85 456.50 02Jan2018 12 p.m. 13.15 4.50 43.77 534.10 02Jan2018 1 p.m. 16.00 4.30 39.70 547.70 02Jan2018 2 p.m. 18.75 7.60 32.59 513.00 02Jan2018 3 p.m. 20.28 10.00 29.48 410.70 02Jan2018 4 p.m. 21.06 9.40 29.41 227.20 02Jan2018 5 p.m. 20.82 9.60 32.06 72.40 02Jan2018 6 p.m. 17.85 6.80 37.92 0.00 02Jan2018 7 p.m. 23.58 9.50 55.65 0.00 02Jan2018 8 p.m. 14.25 6.10 48.28 0.00 02Jan2018 9 p.m. 14.54 8.00 48.95 0.00 02Jan2018 10 p.m. 17.08 14.20 45.08 0.00 02Jan2018 11 p.m. 16.07 12.40 46.95 0.00 03Jan2018 12 a.m. 17.15 11.50 47.59 0.00 03Jan2018 1 a.m. 18.68 11.20 48.61 0.00 03Jan2018 2 a.m. 18.95 8.50 48.70 0.00 03Jan2018 3 a.m. 19.18 9.80 52.13 0.00 03Jan2018 4 a.m. 19.17 9.20 56.30 0.00 03Jan2018 5 a.m. 19.85 14.40 60.39 0.00 03Jan2018 6 a.m. 19.63 13.00 64.61 0.00 03Jan2018 7 a.m. 20.55 11.60 67.85 0.00 Accuml. Values 395.87 208.00 1164.11 3148.50 Num. Valid Values 24 24 24 24 Avg. Values 16.49 8.67 48.50 131.19 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.61 334.67 48.50 270.71 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5150 definition: xcompl = 1 - (RELH_avg/100) TdC = -17.5854 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 = 0.2758 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7242 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.2478 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 = 1.6646 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.1774 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.076 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.