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Home My WebLink AboutNC0003573_Application_Cormix_11_20190719CORMIX SESSION REPORT: CORMIX MIXING ZONE EXPERT SYSTEM CORMIX Version 11.OGT HYDR01:Version-I1.0.0.0 Apri1,2018 SITE NAME/LABEL: Fayetteville Works DESIGN CASE: FILE NAME: P:\Clients\Chemours\Projects\Cape Fear River PDXlocal\Analyses Technical\Mixing Zone Model\CORMIX RD2\Model Files for Submittal 220Conc\SIO.34.8MGD\Xl Discharge 34.8MGD.prd Using subsystem CORMIXI: Single Port Discharges Start of session: 07/09/2019--15:12:44 SUMMARY OF INPUT DATA: ----------------------------------------------------------- AMBIENT PARAMETERS: Cross-section = bounded Width BS = 46.27 m Channel regularity ICHREG = 1 Ambient flowrate QA = 13.22 m^3/s Average depth HA = 5.77 m Depth at discharge HD = 5.77 m Ambient Velocity UA = 0.0496 m/s Darcy-Weisbach friction factor F = 0.0448 Calculated from Manning's n = 0.032 Wind velocity UW = 3.53 m/s Stratification Type STRCND = U Surface temperature = 21.60 degC Bottom temperature = 21.60 degC Calculated FRESH -WATER DENSITY values: Surface density RHOAS = 997.8614 kg/m^3 Bottom density RHOAB = 997.8614 kg/m^3 ----------------------------------------------------------- DISCHARGE PARAMETERS: Single Port Discharge Nearest bank = right Distance to bank DISTB = 0 m Port diameter DO = 1.524 m Port cross -sectional area AO = 1.8241 m^2 Discharge velocity UO = 1.00 m/s Discharge flowrate QO = 1.830967 m^3/s Discharge port height HO = 5.22 m Vertical discharge angle THETA = -1.64 deg Horizontal discharge angle SIGMA = 90 deg Discharge temperature (freshwater) = 33 degC Corresponding density RHO0 = 994.7016 kg/m^3 Density difference DRHO = 3.1598 kg/m^3 Buoyant acceleration GPO = 0.0311 m/s^2 Discharge concentration CO = 0.00022 mg/1 Surface heat exchange coeff. KS = 0 m/s Coefficient of decay ----------------------------------------------------------- KD = 0 /s DISCHARGE/ENVIRONMENT LENGTH SCALES: LQ = 1.35 m Lm = 27.36 m Lb = 467.16 m LM = 6.62 m Lm' 99999 m Lb' 99999 m ----------------------------------------------------------- NON-DIMENSIONAL PARAMETERS: Port densimetric Froude number FRO = 4.61 Velocity ratio R = 20.25 --------------------------------------------------------------- MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS Toxic discharge = no Water quality standard specified = no Regulatory mixing zone = no Region of interest = 600 m downstream HYDRODYNAMIC CLASSIFICATION: I FLOW CLASS = IPHS I ------------------------- This flow configuration applies to a layer corresponding to the full water depth at the discharge site. Applicable layer depth = water depth = 5.77 m Limiting Dilution S = (QA/QO)+ 1.0 = 8.2 MIXING ZONE EVALUATION (hydrodynamic and regulatory summary): X-Y-Z Coordinate system: Origin is located at the BOTTOM below the port/diffuser center: 0 m from the right bank/shore. Number of display steps NSTEP = 1000 per module. ------------------------------------------------------------------------- NEAR-FIELD REGION (NFR) CONDITIONS : Note: The NFR is the zone of strong initial mixing. It has no regulatory implication. However, this information may be useful for the discharge designer because the mixing in the NFR is usually sensitive to the discharge design conditions. Pollutant concentration at NFR edge c = 0 mg/l Dilution at edge of NFR s = 6.7 NFR Location: x = 10.37 m (centerline coordinates) y = 43.38 m z = 5.77 m NFR plume dimensions: half -width (bh) = 4.40 m thickness (by) = 5.77 m Cumulative travel time: 150.4690 sec. Buoyancy assessment: The effluent density is less than the surrounding ambient water density at the discharge level. Therefore, the effluent is POSITIVELY BUOYANT and will tend to rise towards the surface. ----------------------------------------------------------------------------- Near-field instability behavior: The discharge flow will experience instabilities with full vertical mixing in the near -field. There may be benthic impact of high pollutant concentrations. ----------------------------------------------------------------------------- FAR-FIELD MIXING SUMMARY: Plume becomes vertically fully mixed WITHIN NEAR -FIELD at 0 m downstream, but RE -STRATIFIES LATER and is not mixed in the far -field. Plume becomes laterally fully mixed at 15.04 m downstream. ----------------------------------------------------------------------------- PLUME BANK CONTACT SUMMARY: Plume in bounded section contacts nearest bank at 10.37 m downstream. Plume contacts second bank at 15.04 m downstream. ************************ TOXIC DILUTION ZONE SUMMARY ************************ No TDZ was specified for this simulation. ********************** REGULATORY MIXING ZONE SUMMARY *********************** No RMZ and no ambient water quality standard have been specified. ********************* FINAL DESIGN ADVICE AND COMMENTS ********************** REMINDER: The user must take note that HYDRODYNAMIC MODELING by any known technique is NOT AN EXACT SCIENCE. Extensive comparison with field and laboratory data has shown that the CORMIX predictions on dilutions and concentrations (with associated plume geometries) are reliable for the majority of cases and are accurate to within about +-50% (standard deviation). As a further safeguard, CORMIX will not give predictions whenever it judges the design configuration as highly complex and uncertain for prediction.