Detailed Weather Data for Project: CHOU

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 3.43 10.00 75.42 0.00 01Jan2018 9 a.m. 3.78 9.20 74.82 87.00 01Jan2018 10 a.m. 5.29 9.70 71.85 272.30 01Jan2018 11 a.m. 7.68 7.50 66.88 418.80 01Jan2018 12 p.m. 10.13 7.40 60.48 519.50 01Jan2018 1 p.m. 12.45 6.30 56.17 559.60 01Jan2018 2 p.m. 14.36 6.30 51.68 537.00 01Jan2018 3 p.m. 16.09 6.20 46.82 453.20 01Jan2018 4 p.m. 16.97 5.90 46.14 315.30 01Jan2018 5 p.m. 17.01 6.20 45.42 137.10 01Jan2018 6 p.m. 15.62 6.50 49.58 0.20 01Jan2018 7 p.m. 21.72 1.60 44.64 0.00 01Jan2018 8 p.m. 12.63 4.70 56.68 0.00 01Jan2018 9 p.m. 12.29 5.00 57.73 0.00 01Jan2018 10 p.m. 12.94 3.10 61.37 0.00 01Jan2018 11 p.m. 13.32 3.10 56.62 0.00 02Jan2018 12 a.m. 13.12 3.40 56.53 0.00 02Jan2018 1 a.m. 11.73 4.00 64.61 0.00 02Jan2018 2 a.m. 10.65 2.60 70.58 0.00 02Jan2018 3 a.m. 11.93 1.20 71.18 0.00 02Jan2018 4 a.m. 13.06 0.40 65.80 0.00 02Jan2018 5 a.m. 13.95 0.80 63.99 0.00 02Jan2018 6 a.m. 14.29 1.00 65.86 0.00 02Jan2018 7 a.m. 14.67 0.90 71.54 0.00 Accuml. Values 299.10 113.00 1452.39 3300.00 Num. Valid Values 24 24 24 24 Avg. Values 12.46 4.71 60.52 137.50 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -10.85 181.82 60.52 283.73 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3948 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.9873 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 = 0.2455 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7545 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.3163 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 = 1.0633 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.9998 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

Go to Tulsa District Water Control Home Page.