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Home My WebLink AboutNC0089745_Appendix C-Cormix Reports_20180101CORMIX2 PREDICTION FILE: 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 CORMIX MIXING ZONE EXPERT SYSTEM Subsystem CORMIX2: Multiport Diffuser Discharges CORMIX Version 10.OGT HYDRO2 Version 10.0.2.0 April 2017 ---------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------- CASE DESCRIPTION Site name/label: Wallace Creek Design case: Locl_PosBuoy_2.4MGD_10port_Unsteady _CORMIX2 FILE NAME: X:\...7\Loci_PosBuoy_2.4MGD_10port_Unsteady_CORMIX2.prd Time stamp: 10/24/2017--16:09:29 ENVIRONMENT PARAMETERS (metric units) Bounded section BS = 579.12 AS = 1235.61 QA = 29.16 ICHREG= 1 HA = 2.13 HD = 2.74 Tidal Simulation at TIME = 0.800 h PERIOD= 12.40 h UAmax = 0.091 dUa/dt= 0.030 (m/s)/h UA = 0.024 F = 0.040 USTAR =0.1669E-02 UW = 0.000 UWSTAR=0.0000E+00 Uniform density environment STRCND= U RHOAM = 1016.5100 DIFFUSER DISCHARGE PARAMETERS (metric units) Diffuser type: DITYPE= unidirectional -parallel BANK = RIGHT DISTB = 213.36 YB1 = 213.36 YB2 = 213.36 LD = 27.43 NOPEN = 10 NRISER= 10 SPAC = 3.05 NPPERR = 1 DO = 0.063 AO = 0.003 HO = 0.61 SUBO 2.13 DOINP = 0.067 CRO = 0.900 Nozzle/port arrangement: unidirectional_without_fanning GAMMA = 0.00 THETA = 0.00 SIGMA = 90.00 BETA = 90.00 UO = 3.324 QO = 0.105 QOA =0.1051E+00 RH00 = 999.1000 DRHO0 =0.1741E+02 GPO =0.1680E+00 CO =0.1000E+02 CUNITS= ppb IPOLL = 1 KS =0.0000E+00 KD =0.0000E+00 FLUX VARIABLES - PER UNIT DIFFUSER LENGTH (metric units) q0 =0.3833E-02 m0 =0.1147E-01 j0 =0.5794E-03 SIGNJO= 1.0 Associated 2-d length scales (meters) 1Q=B = 0.001 1M = 1.65 lm = 22.87 lmp = 99999.00 lbp = 99999.00 la = 99999.00 FLUX VARIABLES - ENTIRE DIFFUSER (metric units) QO =0.1051E+00 MO =0.3145E+00 JO =0.1589E-01 Associated 3-d length scales (meters) LQ = 0.06 LM = 3.33 Lm = 25.05 Lb = 1343.63 Imp = 99999.00 Lbp = 99999.00 Tidal: Tu = 0.5736 h Lu = 34.937 Lmin = 6.464 NON -DIMENSIONAL PARAMETERS FRO = 251.73 FRDO = 32.19 R = 140.84 PL = 79.57 (slot) (port/nozzle) RECOMPUTED SOURCE CONDITIONS FOR RISER GROUPS: Properties of riser group with 1 ports/nozzles each: UO 3.324 DO = 0.063 AO = 0.003 THETA 0.00 FRO = 251.73 FRDO = 32.19 R = 140.84 (slot) (riser group) FLOW CLASSIFICATION 222222222222222222222222222222222222222222 2 Flow class (CORMIX2) = MU4 2 2 Applicable layer depth HS = 2.74 2 2 Limiting Dilution S=QA/Q0= 278.32 2 222222222222222222222222222222222222222222 MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS CO =0.1000E+02 CUNITS= ppb NTOX = 0 NSTD = 1 CSTD =0.1000E+O1 REGMZ = 0 XINT = 5792.00 XMAX = 5792.00 X -Y -Z COORDINATE SYSTEM: ORIGIN is located at the bottom and the diffuser mid -point: 213.36 m from the RIGHT bank/shore. X-axis points downstream, Y-axis points to left, Z-axis points upward. NSTEP = 50 display intervals per module -------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------- BEGIN MOD201: DIFFUSER DISCHARGE MODULE Due to complex near -field motions: EQUIVALENT SLOT DIFFUSER (2-D) GEOMETRY Profile definitions: BV = Gaussian 1/e (370) half -width, in vertical plane normal to trajectory BH top -hat half -width, in horizontal plane normal to trajectory S hydrodynamic centerline dilution C = centerline concentration (includes reaction effects, if any) Uc = Local centerline excess velocity (above ambient) TT = Cumulative travel time X Y Z S C BV BH UC IT 0.00 0.00 0.61 1.0 0.100E+02 0.00 13.72 3.324 .00000E+00 END OF MOD201: DIFFUSER DISCHARGE MODULE ---------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------- BEGIN MOD273: UNIDIRECTIONAL CROSS-FLOWING DIFFUSER (TEE) IN STRONG CURRENT Because of the strong ambient current the diffuser plume of this crossflowing discharge gets RAPIDLY DEFLECTED. A near-field zone is formed that is VERTICALLY FULLY MIXED over the entire layer depth. Full mixing is achieved at a downstream distance of about five (5) layer depths. Profile definitions: BV layer depth (vertically mixed) BH = top-hat half-width, measured horizontally in Y-direction S = hydrodynamic average (bulk) dilution C = average (bulk) concentration (includes reaction effects, if any) TT = Cumulative travel time X Y Z S C BV BH IT 0.00 0.00 0.61 1.0 0.100E+02 0.00 13.72 .00000E+00 0.55 2.29 0.64 4.6 0.216E+01 0.11 13.88 .23247E+02 1.10 4.57 0.67 6.0 0.166E+01 0.22 14.05 .46495E+02 1.65 6.86 0.70 7.1 0.142E+01 0.33 14.22 .69742E+02 2.19 9.15 0.73 7.9 0.127E+01 0.44 14.39 .92990E+02 2.74 11.44 0.76 8.6 0.117E+01 0.55 14.56 .11624E+03 3.29 13.72 0.79 9.2 0.109E+01 0.66 14.73 .13948E+03 3.84 16.01 0.82 9.7 0.103E+01 0.77 14.90 .16273E+03 ** WATER QUALITY STANDARD OR CCC HAS BEEN FOUND ** The pollutant concentration in the plume falls below water quality standard or CCC value of 0.100E+01 in the current prediction interval. This is the spatial extent of concentrations exceeding the water quality standard or CCC value. 4.39 18.30 0.85 10.2 0.985E+00 0.88 15.06 .18598E+03 4.94 20.59 0.88 10.6 0.945E+00 0.99 15.23 .20923E+03 5.49 22.87 0.91 11.0 0.911E+00 1.10 15.40 .23247E+03 6.04 25.16 0.94 11.3 0.882E+00 1.21 15.57 .25572E+03 6.58 27.45 0.98 11.7 0.857E+00 1.32 15.74 .27897E+03 7.13 29.74 1.01 12.0 0.835E+00 1.43 15.91 .30222E+03 7.68 32.02 1.04 12.3 0.815E+00 1.54 16.08 .32546E+03 8.23 34.31 1.07 12.5 0.797E+00 1.65 16.24 .34871E+03 8.78 36.60 1.10 12.8 0.781E+00 1.76 16.41 .37196E+03 9.33 38.89 1.13 13.1 0.766E+00 1.87 16.58 .39521E+03 9.88 41.17 1.16 13.3 0.752E+00 1.98 16.75 .41845E+03 10.42 43.46 1.19 13.5 0.740E+00 2.09 16.92 .44170E+03 10.82 45.10 1.21 13.7 0.731E+00 2.16 17.04 Cumulative travel time = 458.3663 sec ( 0.13 hrs) CORMIX prediction has been TERMINATED at last prediction interval. Limiting time due to TIDAL REVERSAL has been reached. END OF MOD273: UNIDIRECTIONAL CROSS-FLOWING DIFFUSER (TEE) IN STRONG CURRENT ---------------------------------------------------------------------------------------------- ** End of NEAR-FIELD REGION (NFR) ** ---------------------------------------------------------------------------------------------- CORMIX2: Multipart Diffuser Discharges End of Prediction File 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 CORMIX SESSION REPORT: CORMIX MIXING ZONE EXPERT SYSTEM CORMIX Version 10.OGT HYDR02:Version-10.0.2.0 April,2017 SITE NAME/LABEL: Wallace Creek DESIGN CASE: Locl PosBuoy 2.4MGD 10port Unsteady CORMIX2 FILE NAME: X:\119-WE15 Camp Lejeune Membrane WTP Discharge Permitting\CORMIX\October 2017\LOCI POSBUoy 2.4MGD 10port Unsteady CORMIX2.prd Using subsystem CORMIX2: Multiport Diffuser Discharges Start of session: 10/24/2017--16:06:17 SUMMARY OF INPUT DATA: AMBIENT PARAMETERS: Cross-section = bounded Width BS = 579.12 m Channel regularity ICHREG = 1 Ambient flowrate QA = 29.16 m^3/s Average depth HA = 2.13 m Depth at discharge HD = 2.74 m Darcy -Weisbach friction factor F = 0.04 Wind velocity UW = 0 m/s TIDAL SIMULATION at time Tsim = 0.8 hours Instantaneous ambient velocity UA = 0.0236 m/s Maximum tidal velocity UaMAX = 0.0915 m/s Rate of tidal reversal dUA/dt = 0.0295 (m/s)/hour Period of reversal T = 12.4 hours Stratification Type STRCND = U Surface density RHOAS = 1016.51 kg/m^3 Bottom density ----------------------------------------------------------------------------- RHOAB = 1016.51 kg/m^3 DISCHARGE PARAMETERS: Submerged Multiport Diffuser Discharge Diffuser type DITYPE = unidirectional parallel Diffuser length LD = 27.43 m Nearest bank = right Diffuser endpoints YB1 = 213.36 m; YB2 = 213.36 m Number of openings NOPEN = 10 Number of Risers NRISER = 10 Ports/Nozzles per Riser NPPERR = 1 Spacing between risers/openings SPAC = 3.05 m Port/Nozzle diameter DO = 0.0635 m with contraction ratio = 0.9 Equivalent slot width BO = 0.0010 m Total area of openings TAO = 0.0316 m^2 Discharge velocity UO = 3.32 m/s Total discharge flowrate QO = 0.10515 m^3/s Discharge port height HO = 0.61 m Nozzle arrangement RETYPE = unidirectional without fanning Diffuser alignment angle GAMMA = 0 deg Vertical discharge angle THETA = 0 deg Actual Vertical discharge angle THEAC = 0 deg Horizontal discharge angle SIGMA = 90 deg Relative orientation angle BETA = 90 deg Discharge density RHOO = 999.1000 kg/m^3 Density difference DRHO = 17.4100 kg/m^3 Buoyant acceleration GPO = 0.168 m/s^2 Discharge concentration CO = 10 ppb Surface heat exchange coeff. KS = 0 m/s Coefficient of decay ----------------------------------------------------------------------------- KD = 0 /s FLUX VARIABLES PER UNIT DIFFUSER LENGTH: Discharge (volume flux) qO = 0.003833 m^2/s Momentum flux m0 = 0.012740 m^3/s^2 Buoyancy flux ----------------------------------------------------------------------------- j0 = 0.000644 m^3/s^3 DISCHARGE/ENVIRONMENT LENGTH SCALES: LQ 0.00 m Lm = 22.87 m LM 1.65 m lm' = 99999 m Lb' = 99999 m La = 99999 m UNSTEADY TIDAL SCALES: To = 0.5736 hours Lu = 34.94 m Lmin= 6.46 m (These refer to the actual discharge/environment length scales.) ----------------------------------------------------------------------------- NON-DIMENSIONAL PARAMETERS: Slot Froude number FRO = 251.73 Port/nozzle Froude number FRDO = 32.19 Velocity ratio R = 140.84 ----------------------------------------------------------------------------- MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS: Toxic discharge = no Water quality standard specified = yes Water quality standard CSTD = 1 ppb Regulatory mixing zone = no Region of interest = 5792 m downstream HYDRODYNAMIC CLASSIFICATION: -------------------------- I FLOW CLASS = MU4 I ------------------------ This flow configuration applies to a layer corresponding to the full water depth at the discharge site. Applicable layer depth = water depth = 2.74 m Limiting Dilution S = (QA/QO)+ 1.0 = 278.3 MIXING ZONE EVALUATION (hydrodynamic and regulatory summary): ----------------------------------------------------------------------------- X-Y-Z Coordinate system: Origin is located at the BOTTOM below the port/diffuser center: 213.36 m from the right bank/shore. Number of display steps NSTEP = 50 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 = 0.7278 ppb Dilution at edge of NFR s = 13.7 NFR Location: x = 27.43 m (centerline coordinates) y = 114.37 m z = 2.74 m NFR plume dimensions: half -width (bh) = 22.14 m thickness (bv) = 2.74 m Cumulative travel time: 458.3663 sec. WARNING: The LIMITING DILUTION (given by ambient flow/discharge ratio) is = 0 This value is below the computed dilution of 13.74 at the end of the Near Field Region (NFR). Mixing for this discharge configuration is constrained by the ambient flow. Please carefully review the prediction file for additional warnings and information. ----------------------------------------------------------------------------- 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 diffuser 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 ALREADY IN NEAR -FIELD at 0 m downstream and continues as vertically mixed into the far -field. ----------------------------------------------------------------------------- PLUME BANK CONTACT SUMMARY: Plume in bounded section does not contact bank. ----------------------------------------------------------------------------- UNSTEADY TIDAL ASSESSMENT: Because of the unsteadiness of the ambient current during the tidal reversal, CORMIX predictions have been TERMINATED at: x = 10.82 m y = 45.10 m z = 1.21 m. For this condition AFTER TIDAL REVERSAL, mixed water from the previous half -cycle becomes re -entrained into the near field of the discharge, increasing pollutant concentrations compared to steady-state predictions. A pool of mixed water formed at slack tide will be advected downstream in this phase. ************************ TOXIC DILUTION ZONE SUMMARY ************************ No TDZ was specified for this simulation. REGULATORY MIXING ZONE SUMMARY *****•*+*+*+*+*+*+**.*+ No RMZ has been specified. However: The ambient water quality standard was encountered at the following plume position: Water quality standard = 1 ppb Corresponding dilution s = 10.0 Plume location: x = 4.21 m (centerline coordinates) y = 17.56 m z = 0.84 m Plume dimensions: half -width (bh) = 15.01 m thickness (bv) = 0.84 m ********************* FINAL DESIGN ADVICE AND COMMENTS ********************** CORMIX2 uses the TWO-DIMENSIONAL SLOT DIFFUSER CONCEPT to represent the actual three-dimensional diffuser geometry. Thus, it approximates the details of the merging process of the individual jets from each port/nozzle. In the present design, the spacing between adjacent ports/nozzles (or riser assemblies) is of the order of, or less than, the local water depth so that the slot diffuser approximation holds well. Nevertheless, if this is a final design, the user is advised to use a final CORMIXI (single port discharge) analysis, with discharge data for an individual diffuser jet/plume, in order to compare to the present near -field prediction. ----------------------------------------------------------------------------- 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 +-50o (standard deviation). As a further safeguard, CORMIX will not give predictions whenever it judges the design configuration as highly complex and uncertain for prediction. CORMIX2 PREDICTION FILE: 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 CORMIX MIXING ZONE EXPERT SYSTEM Subsystem CORMIX2: Multiport Diffuser Discharges CORMIX Version 10.OGT HYDRO2 Version 10.0.2.0 April 2017 ---------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------- CASE DESCRIPTION Site name/label: Wallace Creek Design case: Loc2_PosBuoy_2.4MGD_10port_Unsteady _CORMIX2 FILE NAME: X:\...7\Loc2_PosBuoy_2.4MGD_10port_Unsteady_CORMIX2.prd Time stamp: 10/24/2017--16:09:06 ENVIRONMENT PARAMETERS (metric units) Bounded section BS = 335.28 AS = 613.16 QA = 16.28 ICHREG= 1 HA = 1.83 HD = 2.13 Tidal Simulation at TIME = 0.900 h PERIOD= 12.40 h UAmax = 0.091 dUa/dt= 0.030 (m/s)/h UA = 0.027 F = 0.040 USTAR =0.1877E-02 UW = 0.000 UWSTAR=0.0000E+00 Uniform density environment STRCND= U RHOAM = 1016.5100 DIFFUSER DISCHARGE PARAMETERS (metric units) Diffuser type: DITYPE= unidirectional -parallel BANK = RIGHT DISTB = 91.44 YB1 = 91.44 YB2 = 91.44 LD = 27.43 NOPEN = 10 NRISER= 10 SPAC = 3.05 NPPERR = 1 DO = 0.063 AO = 0.003 HO = 0.61 SUBO 1.52 DOINP = 0.067 CRO = 0.900 Nozzle/port arrangement: unidirectional_without_fanning GAMMA = 0.00 THETA = 0.00 SIGMA = 90.00 BETA = 90.00 UO = 3.324 QO = 0.105 QOA =0.1051E+00 RH00 = 999.1000 DRHO0 =0.1741E+02 GPO =0.1680E+00 CO =0.1000E+02 CUNITS= ppb IPOLL = 1 KS =0.0000E+00 KD =0.0000E+00 FLUX VARIABLES - PER UNIT DIFFUSER LENGTH (metric units) q0 =0.3833E-02 m0 =0.1147E-01 j0 =0.5794E-03 SIGNJO= 1.0 Associated 2-d length scales (meters) 1Q=B = 0.001 1M = 1.65 lm = 18.07 lmp = 99999.00 lbp = 99999.00 la = 99999.00 FLUX VARIABLES - ENTIRE DIFFUSER (metric units) QO =0.1051E+00 MO =0.3145E+00 JO =0.1589E-01 Associated 3-d length scales (meters) LQ = 0.06 LM = 3.33 Lm = 22.27 Lb = 943.68 Imp = 99999.00 Lbp = 99999.00 Tidal: Tu = 0.5736 h Lu = 34.937 Lmin = 6.464 NON -DIMENSIONAL PARAMETERS FRO = 251.73 FRDO = 32.19 R = 125.19 PL = 79.57 (slot) (port/nozzle) RECOMPUTED SOURCE CONDITIONS FOR RISER GROUPS: Properties of riser group with 1 ports/nozzles each: UO 3.324 DO = 0.063 AO = 0.003 THETA 0.00 FRO = 251.73 FRDO = 32.19 R = 125.19 (slot) (riser group) FLOW CLASSIFICATION 222222222222222222222222222222222222222222 2 Flow class (CORMIX2) = MU4 2 2 Applicable layer depth HS = 2.13 2 2 Limiting Dilution S=QA/Q0= 155.82 2 222222222222222222222222222222222222222222 MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS CO =0.1000E+02 CUNITS= ppb NTOX = 0 NSTD = 1 CSTD =0.1000E+O1 REGMZ = 0 XINT = 3353.00 XMAX = 3353.00 X -Y -Z COORDINATE SYSTEM: ORIGIN is located at the bottom and the diffuser mid -point: 91.44 m from the RIGHT bank/shore. X-axis points downstream, Y-axis points to left, Z-axis points upward. NSTEP = 50 display intervals per module -------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------- BEGIN MOD201: DIFFUSER DISCHARGE MODULE Due to complex near -field motions: EQUIVALENT SLOT DIFFUSER (2-D) GEOMETRY Profile definitions: BV = Gaussian 1/e (370) half -width, in vertical plane normal to trajectory BH top -hat half -width, in horizontal plane normal to trajectory S hydrodynamic centerline dilution C = centerline concentration (includes reaction effects, if any) Uc = Local centerline excess velocity (above ambient) TT = Cumulative travel time X Y Z S C BV BH Uc IT 0.00 0.00 0.61 1.0 0.100E+02 0.00 13.72 3.324 .00000E+00 END OF MOD201: DIFFUSER DISCHARGE MODULE ---------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------- BEGIN MOD273: UNIDIRECTIONAL CROSS -FLOWING DIFFUSER (TEE) IN STRONG CURRENT Because of the strong ambient current the diffuser plume of this crossflowing discharge gets RAPIDLY DEFLECTED. A near -field zone is formed that is VERTICALLY FULLY MIXED over the entire layer depth. Full mixing is achieved at a downstream distance of about five (5) layer depths. Profile definitions: BV layer depth (vertically mixed) BH = top -hat half -width, measured horizontally in Y -direction S = hydrodynamic average (bulk) dilution C = average (bulk) concentration (includes reaction effects, if any) TT = Cumulative travel time X Y Z S C BV BH IT 0.00 0.00 0.61 1.0 0.100E+02 0.00 13.72 .00000E+00 0.49 2.32 0.63 4.2 0.239E+01 0.10 13.89 .18368E+02 0.98 4.65 0.65 5.4 0.184E+01 0.20 14.06 .36737E+02 1.46 6.97 0.67 6.3 0.158E+01 0.29 14.24 .55105E+02 1.95 9.30 0.69 7.0 0.142E+01 0.39 14.41 .73473E+02 2.44 11.62 0.71 7.6 0.131E+01 0.49 14.58 .91842E+02 2.93 13.94 0.74 8.2 0.122E+01 0.59 14.76 .11021E+03 3.41 16.27 0.76 8.6 0.116E+01 0.68 14.93 .12858E+03 3.90 18.59 0.78 9.0 0.111E+01 0.78 15.10 .14695E+03 4.39 20.91 0.80 9.4 0.106E+01 0.88 15.28 .16532E+03 4.88 23.24 0.82 9.8 0.103E+01 0.98 15.45 .18368E+03 ** WATER QUALITY STANDARD OR OCT HAS BEEN FOUND ** The pollutant concentration in the plume falls below water quality standard or CCC value of 0.100E+01 in the current prediction interval. This is the spatial extent of concentrations exceeding the water quality standard or CCC value. 5.36 25.56 0.84 10.1 0.994E+00 1.07 15.62 .20205E+03 5.85 27.89 0.86 10.4 0.966E+00 1.17 15.80 .22042E+03 6.34 30.21 0.88 10.6 0.941E+00 1.27 15.97 .23879E+03 6.83 32.53 0.90 10.9 0.919E+00 1.37 16.14 .25716E+03 7.32 34.86 0.92 11.1 0.899E+00 1.46 16.32 .27553E+03 7.80 37.18 0.94 11.4 0.881E+00 1.56 16.49 .29389E+03 8.29 39.50 0.96 11.6 0.864E+00 1.66 16.66 .31226E+03 8.78 41.83 0.99 11.8 0.849E+00 1.76 16.84 .33063E+03 9.27 44.15 1.01 12.0 0.835E+00 1.85 17.01 .34900E+03 9.75 46.48 1.03 12.2 0.822E+00 1.95 17.18 .36737E+03 10.24 48.80 1.05 12.4 0.810E+00 2.05 17.36 .38574E+03 10.73 51.12 1.07 12.5 0.798E+00 2.13 17.53 .40410E+03 11.22 53.45 1.07 12.7 0.787E+00 2.13 17.70 .42247E+03 11.70 55.77 1.07 12.9 0.777E+00 2.13 17.88 .44084E+03 12.19 58.09 1.07 13.0 0.767E+00 2.13 18.05 .45921E+03 12.68 60.42 1.07 13.2 0.758E+00 2.13 18.22 .47758E+03 13.17 62.74 1.07 13.3 0.749E+00 2.13 18.40 .49595E+03 13.66 65.07 1.07 13.5 0.741E+00 2.13 18.57 .51431E+03 13.69 65.24 1.07 13.5 0.740E+00 2.13 18.58 Cumulative travel time = 515.6620 sec ( 0.14 hrs) CORMIX prediction has been TERMINATED at last prediction interval. Limiting time due to TIDAL REVERSAL has been reached. END OF MOD273: UNIDIRECTIONAL CROSS -FLOWING DIFFUSER (TEE) IN STRONG CURRENT ---------------------------------------------------------------------------------------------- ** End of NEAR -FIELD REGION (NFR) ** ---------------------------------------------------------------------------------------------- CORMIX2: Multipart Diffuser Discharges End of Prediction File 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 CORMIX SESSION REPORT: CORMIX MIXING ZONE EXPERT SYSTEM CORMIX Version 10.OGT HYDRO2:Version-10.0.2.0 April,2017 SITE NAME/LABEL: Wallace Creek DESIGN CASE: Loc2 PosBuoy 2.4MGD 10port Unsteady CORMIX2 FILE NAME: X:\119-WE15 Camp Lejeune Membrane WTP Discharge Permitting\CORMIX\October 2017\Loc2 POSBUoy 2.4MGD 10port Unsteady CORMIX2.prd Using subsystem CORMIX2: Multiport Diffuser Discharges Start of session: 10/24/2017--16:07:09 SUMMARY OF INPUT DATA: AMBIENT PARAMETERS: Cross-section = bounded Width BS = 335.28 m Channel regularity ICHREG = 1 Ambient flowrate QA = 16.28 m^3/s Average depth HA = 1.83 m Depth at discharge HD = 2.13 m Darcy -Weisbach friction factor F = 0.04 Wind velocity UW = 0 m/s TIDAL SIMULATION at time Tsim = 0.9 hours Instantaneous ambient velocity UA = 0.0266 m/s Maximum tidal velocity UaMAX = 0.0915 m/s Rate of tidal reversal dUA/dt = 0.0295 (m/s)/hour Period of reversal T = 12.4 hours Stratification Type STRCND = U Surface density RHOAS = 1016.51 kg/m^3 Bottom density ----------------------------------------------------------------------------- RHOAB = 1016.51 kg/m^3 DISCHARGE PARAMETERS: Submerged Multiport Diffuser Discharge Diffuser type DITYPE = unidirectional parallel Diffuser length LD = 27.43 m Nearest bank = right Diffuser endpoints YB1 = 91.44 m; YB2 = 91.44 m Number of openings NOPEN = 10 Number of Risers NRISER = 10 Ports/Nozzles per Riser NPPERR = 1 Spacing between risers/openings SPAC = 3.05 m Port/Nozzle diameter DO = 0.0635 m with contraction ratio = 0.9 Equivalent slot width BO = 0.0010 m Total area of openings TAO = 0.0316 m^2 Discharge velocity UO = 3.32 m/s Total discharge flowrate QO = 0.10515 m^3/s Discharge port height HO = 0.61 m Nozzle arrangement RETYPE = unidirectional without fanning Diffuser alignment angle GAMMA = 0 deg Vertical discharge angle THETA = 0 deg Actual Vertical discharge angle THEAC = 0 deg Horizontal discharge angle SIGMA = 90 deg Relative orientation angle BETA = 90 deg Discharge density RHOO = 999.1000 kg/m^3 Density difference DRHO = 17.4100 kg/m^3 Buoyant acceleration GPO = 0.168 m/s^2 Discharge concentration CO = 10 ppb Surface heat exchange coeff. KS = 0 m/s Coefficient of decay ----------------------------------------------------------------------------- KD = 0 /s FLUX VARIABLES PER UNIT DIFFUSER LENGTH: Discharge (volume flux) q0 = 0.003833 m^2/s Momentum flux m0 = 0.012740 m^3/s^2 Buoyancy flux ----------------------------------------------------------------------------- j0 = 0.000644 m^3/s^3 DISCHARGE/ENVIRONMENT LENGTH SCALES: LQ 0.00 m Lm = 18.07 m LM 1.65 m lm' = 99999 m Lb' = 99999 m La = 99999 m UNSTEADY TIDAL SCALES: To = 0.5736 hours Lu = 34.94 m Lmin= 6.46 m (These refer to the actual discharge/environment length scales.) ----------------------------------------------------------------------------- NON-DIMENSIONAL PARAMETERS: Slot Froude number FRO = 251.73 Port/nozzle Froude number FRDO = 32.19 Velocity ratio R = 125.19 ----------------------------------------------------------------------------- MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS: Toxic discharge = no Water quality standard specified = yes Water quality standard CSTD = 1 ppb Regulatory mixing zone = no Region of interest = 3353 m downstream HYDRODYNAMIC CLASSIFICATION: -------------------------- I FLOW CLASS = MU4 I ------------------------ This flow configuration applies to a layer corresponding to the full water depth at the discharge site. Applicable layer depth = water depth = 2.13 m Limiting Dilution S = (QA/QO)+ 1.0 = 155.8 MIXING ZONE EVALUATION (hydrodynamic and regulatory summary): ----------------------------------------------------------------------------- X-Y-Z Coordinate system: Origin is located at the BOTTOM below the port/diffuser center: 91.44 m from the right bank/shore. Number of display steps NSTEP = 50 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 = 0.7327 ppb Dilution at edge of NFR s = 13.6 NFR Location: x = 24.38 m (centerline coordinates) y = 116.19 m z = 2.13 m NFR plume dimensions: half -width (bh) = 22.38 m thickness (bv) = 2.13 m Cumulative travel time: 515.6620 sec. WARNING: The LIMITING DILUTION (given by ambient flow/discharge ratio) is = 0 This value is below the computed dilution of 13.65 at the end of the Near Field Region (NFR). Mixing for this discharge configuration is constrained by the ambient flow. Please carefully review the prediction file for additional warnings and information. ----------------------------------------------------------------------------- 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 diffuser 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 ALREADY IN NEAR -FIELD at 0 m downstream and continues as vertically mixed into the far -field. ----------------------------------------------------------------------------- PLUME BANK CONTACT SUMMARY: Plume in bounded section does not contact bank. ----------------------------------------------------------------------------- UNSTEADY TIDAL ASSESSMENT: Because of the unsteadiness of the ambient current during the tidal reversal, CORMIX predictions have been TERMINATED at: x = 13.69 m y = 65.24 m z = 1.07 m. For this condition AFTER TIDAL REVERSAL, mixed water from the previous half -cycle becomes re -entrained into the near field of the discharge, increasing pollutant concentrations compared to steady-state predictions. A pool of mixed water formed at slack tide will be advected downstream in this phase. ************************ TOXIC DILUTION ZONE SUMMARY ************************ No TDZ was specified for this simulation. REGULATORY MIXING ZONE SUMMARY *****•*+*+*+*+*+*+**.*+ No RMZ has been specified. However: The ambient water quality standard was encountered at the following plume position: Water quality standard = 1 ppb Corresponding dilution s = 10.0 Plume location: x = 5.27 m (centerline coordinates) y = 25.10 m z = 0.84 m Plume dimensions: half -width (bh) = 15.59 m thickness (bv) = 1.05 m ********************* FINAL DESIGN ADVICE AND COMMENTS ********************** CORMIX2 uses the TWO-DIMENSIONAL SLOT DIFFUSER CONCEPT to represent the actual three-dimensional diffuser geometry. Thus, it approximates the details of the merging process of the individual jets from each port/nozzle. In the present design, the spacing between adjacent ports/nozzles (or riser assemblies) is of the order of, or less than, the local water depth so that the slot diffuser approximation holds well. Nevertheless, if this is a final design, the user is advised to use a final CORMIXI (single port discharge) analysis, with discharge data for an individual diffuser jet/plume, in order to compare to the present near -field prediction. ----------------------------------------------------------------------------- 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 +-50o (standard deviation). As a further safeguard, CORMIX will not give predictions whenever it judges the design configuration as highly complex and uncertain for prediction. CORMIX2 PREDICTION FILE: 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 CORMIX MIXING ZONE EXPERT SYSTEM Subsystem CORMIX2: Multiport Diffuser Discharges CORMIX Version 10.OGT HYDRO2 Version 10.0.2.0 April 2017 ---------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------- CASE DESCRIPTION Site name/label: Wallace Creek Design case: Loc3_PosBuoy_2.4MGD_10port_Unsteady _CORMIX2 FILE NAME: X:\...7\Loc3_PosBuoy_2.4MGD_10port_Unsteady_CORMIX2.prd Time stamp: 10/24/2017--16:08:32 ENVIRONMENT PARAMETERS (metric units) Bounded section BS = 304.80 AS = 464.52 QA = 12.33 ICHREG= 1 HA = 1.52 HD = 1.83 Tidal Simulation at TIME = 0.900 h PERIOD= 12.40 h UAmax = 0.091 dUa/dt= 0.030 (m/s)/h UA = 0.027 F = 0.040 USTAR =0.1877E-02 UW = 0.000 UWSTAR=0.0000E+00 Uniform density environment STRCND= U RHOAM = 1016.5100 DIFFUSER DISCHARGE PARAMETERS (metric units) Diffuser type: DITYPE= unidirectional -parallel BANK = RIGHT DISTB = 54.86 YB1 = 54.86 YB2 = 54.86 LD = 27.43 NOPEN = 10 NRISER= 10 SPAC = 3.05 NPPERR = 1 DO = 0.063 AO = 0.003 HO = 0.61 SUBO 1.22 DOINP = 0.067 CRO = 0.900 Nozzle/port arrangement: unidirectional_without_fanning GAMMA = 0.00 THETA = 0.00 SIGMA = 90.00 BETA = 90.00 UO = 3.324 QO = 0.105 QOA =0.1051E+00 RH00 = 999.1000 DRHO0 =0.1741E+02 GPO =0.1680E+00 CO =0.1000E+02 CUNITS= ppb IPOLL = 1 KS =0.0000E+00 KD =0.0000E+00 FLUX VARIABLES - PER UNIT DIFFUSER LENGTH (metric units) q0 =0.3833E-02 m0 =0.1147E-01 j0 =0.5794E-03 SIGNJO= 1.0 Associated 2-d length scales (meters) 1Q=B = 0.001 1M = 1.65 lm = 18.07 lmp = 99999.00 lbp = 99999.00 la = 99999.00 FLUX VARIABLES - ENTIRE DIFFUSER (metric units) QO =0.1051E+00 MO =0.3145E+00 JO =0.1589E-01 Associated 3-d length scales (meters) LQ = 0.06 LM = 3.33 Lm = 22.27 Lb = 943.68 Imp = 99999.00 Lbp = 99999.00 Tidal: Tu = 0.5736 h Lu = 34.937 Lmin = 6.464 NON -DIMENSIONAL PARAMETERS FRO = 251.73 FRDO = 32.19 R = 125.19 PL = 79.57 (slot) (port/nozzle) RECOMPUTED SOURCE CONDITIONS FOR RISER GROUPS: Properties of riser group with 1 ports/nozzles each: UO 3.324 DO = 0.063 AO = 0.003 THETA 0.00 FRO = 251.73 FRDO = 32.19 R = 125.19 (slot) (riser group) FLOW CLASSIFICATION 222222222222222222222222222222222222222222 2 Flow class (CORMIX2) = MU4 2 2 Applicable layer depth HS = 1.83 2 2 Limiting Dilution S=QA/Q0= 118.29 2 222222222222222222222222222222222222222222 MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS CO =0.1000E+02 CUNITS= ppb NTOX = 0 NSTD = 1 CSTD =0.1000E+O1 REGMZ = 0 XINT = 3050.00 XMAX = 3050.00 X -Y -Z COORDINATE SYSTEM: ORIGIN is located at the bottom and the diffuser mid -point: 54.86 m from the RIGHT bank/shore. X-axis points downstream, Y-axis points to left, Z-axis points upward. NSTEP = 50 display intervals per module -------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------- BEGIN MOD201: DIFFUSER DISCHARGE MODULE Due to complex near -field motions: EQUIVALENT SLOT DIFFUSER (2-D) GEOMETRY Profile definitions: BV = Gaussian 1/e (370) half -width, in vertical plane normal to trajectory BH top -hat half -width, in horizontal plane normal to trajectory S hydrodynamic centerline dilution C = centerline concentration (includes reaction effects, if any) Uc = Local centerline excess velocity (above ambient) TT = Cumulative travel time X Y Z S C BV BH UC IT 0.00 0.00 0.61 1.0 0.100E+02 0.00 13.72 3.324 .00000E+00 END OF MOD201: DIFFUSER DISCHARGE MODULE -------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------- BEGIN MOD273: UNIDIRECTIONAL CROSS -FLOWING DIFFUSER (TEE) IN STRONG CURRENT Because of the strong ambient current the diffuser plume of this crossflowing discharge gets RAPIDLY DEFLECTED. A near -field zone is formed that is VERTICALLY FULLY MIXED over the entire layer depth. Full mixing is achieved at a downstream distance of about five (5) layer depths. Profile definitions: BV layer depth (vertically mixed) BH = top -hat half -width, measured horizontally in Y -direction S = hydrodynamic average (bulk) dilution C = average (bulk) concentration (includes reaction effects, if any) TT = Cumulative travel time X Y Z S C BV BH IT 0.00 0.00 0.61 1.0 0.100E+02 0.00 13.72 .00000E+00 0.46 2.71 0.62 4.0 0.249E+01 0.09 13.94 .17220E+02 0.91 5.42 0.64 5.2 0.193E+01 0.18 14.16 .34441E+02 1.37 8.13 0.66 6.0 0.167E+01 0.28 14.38 .51661E+02 1.83 10.84 0.67 6.7 0.150E+01 0.37 14.61 .68881E+02 2.29 13.56 0.69 7.2 0.139E+01 0.46 14.83 .86102E+02 2.74 16.27 0.70 7.7 0.130E+01 0.55 15.05 .10332E+03 3.20 18.98 0.72 8.1 0.123E+01 0.64 15.27 .12054E+03 3.66 21.69 0.73 8.5 0.118E+01 0.73 15.50 .13776E+03 4.11 24.40 0.75 8.8 0.113E+01 0.82 15.72 .15498E+03 4.57 27.11 0.76 9.1 0.110E+01 0.91 15.94 .17220E+03 5.03 29.82 0.78 9.4 0.106E+01 1.01 16.16 .18942E+03 5.49 32.53 0.79 9.7 0.103E+01 1.10 16.39 .20664E+03 5.94 35.24 0.81 9.9 0.101E+01 1.19 16.61 .22386E+03 ** WATER QUALITY STANDARD OR CCC HAS BEEN FOUND ** The pollutant concentration in the plume falls below water quality standard or CCC value of 0.100E+01 in the current prediction interval. This is the spatial extent of concentrations exceeding the water quality standard or CCC value. 6.40 37.95 0.82 10.2 0.985E+00 1.28 16.83 .24108E+03 6.86 40.67 0.84 10.4 0.964E+00 1.37 17.05 .25831E+03 7.32 43.38 0.85 10.6 0.945E+00 1.46 17.28 .27553E+03 7.77 46.09 0.87 10.8 0.928E+00 1.55 17.50 .29275E+03 8.23 48.80 0.88 11.0 0.912E+00 1.65 17.72 .30997E+03 8.69 51.51 0.90 11.1 0.897E+00 1.74 17.95 .32719E+03 9.14 54.22 0.91 11.3 0.883E+00 1.83 18.17 .34441E+03 9.60 56.93 0.91 11.5 0.870E+00 1.83 18.39 .36163E+03 10.06 59.64 0.91 11.7 0.858E+00 1.83 18.61 .37885E+03 10.52 62.35 0.91 11.8 0.847E+00 1.83 18.84 .39607E+03 10.97 65.07 0.91 12.0 0.836E+00 1.83 19.06 .41329E+03 11.43 67.78 0.91 12.1 0.825E+00 1.83 19.28 .43051E+03 11.89 70.49 0.91 12.3 0.815E+00 1.83 19.50 .44773E+03 12.34 73.20 0.91 12.4 0.806E+00 1.83 19.73 .46495E+03 12.80 75.91 0.91 12.6 0.796E+00 1.83 19.95 .48217E+03 13.26 78.62 0.91 12.7 0.787E+00 1.83 20.17 .49939E+03 13.69 81.18 0.91 12.8 0.779E+00 1.83 20.38 Cumulative travel time = 515.6620 sec ( 0.14 hrs) CORMIX prediction has been TERMINATED at last prediction interval. Limiting time due to TIDAL REVERSAL has been reached. END OF MOD273: UNIDIRECTIONAL CROSS -FLOWING DIFFUSER (TEE) IN STRONG CURRENT ---------------------------------------------------------------------------------------------- ** End of NEAR -FIELD REGION (NFR) ** ---------------------------------------------------------------------------------------------- CORMIX2: Multipart Diffuser Discharges End of Prediction File 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 CORMIX SESSION REPORT: CORMIX MIXING ZONE EXPERT SYSTEM CORMIX Version 10.OGT HYDRO2:Version-10.0.2.0 April,2017 SITE NAME/LABEL: Wallace Creek DESIGN CASE: Loc3 PosBuoy 2.4MGD 10port Unsteady CORMIX2 FILE NAME: X:\119-WE15 Camp Lejeune Membrane WTP Discharge Permitting\CORMIX\October 2017\Loc3 POSBUoy 2.4MGD 10port Unsteady CORMIX2.prd Using subsystem CORMIX2: Multiport Diffuser Discharges Start of session: 10/24/2017--16:07:43 SUMMARY OF INPUT DATA: AMBIENT PARAMETERS: Cross-section = bounded Width BS = 304.80 m Channel regularity ICHREG = 1 Ambient flowrate QA = 12.33 m^3/s Average depth HA = 1.52 m Depth at discharge HD = 1.83 m Darcy -Weisbach friction factor F = 0.04 Wind velocity UW = 0 m/s TIDAL SIMULATION at time Tsim = 0.9 hours Instantaneous ambient velocity UA = 0.0266 m/s Maximum tidal velocity UaMAX = 0.0915 m/s Rate of tidal reversal dUA/dt = 0.0295 (m/s)/hour Period of reversal T = 12.4 hours Stratification Type STRCND = U Surface density RHOAS = 1016.51 kg/m^3 Bottom density ----------------------------------------------------------------------------- RHOAB = 1016.51 kg/m^3 DISCHARGE PARAMETERS: Submerged Multiport Diffuser Discharge Diffuser type DITYPE = unidirectional parallel Diffuser length LD = 27.43 m Nearest bank = right Diffuser endpoints YB1 = 54.86 m; YB2 = 54.86 m Number of openings NOPEN = 10 Number of Risers NRISER = 10 Ports/Nozzles per Riser NPPERR = 1 Spacing between risers/openings SPAC = 3.05 m Port/Nozzle diameter DO = 0.0635 m with contraction ratio = 0.9 Equivalent slot width BO = 0.0010 m Total area of openings TAO = 0.0316 m^2 Discharge velocity UO = 3.32 m/s Total discharge flowrate QO = 0.10515 m^3/s Discharge port height HO = 0.61 m Nozzle arrangement RETYPE = unidirectional without fanning Diffuser alignment angle GAMMA = 0 deg Vertical discharge angle THETA = 0 deg Actual Vertical discharge angle THEAC = 0 deg Horizontal discharge angle SIGMA = 90 deg Relative orientation angle BETA = 90 deg Discharge density RHOO = 999.1000 kg/m^3 Density difference DRHO = 17.4100 kg/m^3 Buoyant acceleration GPO = 0.168 m/s^2 Discharge concentration CO = 10 ppb Surface heat exchange coeff. KS = 0 m/s Coefficient of decay ----------------------------------------------------------------------------- KD = 0 /s FLUX VARIABLES PER UNIT DIFFUSER LENGTH: Discharge (volume flux) q0 = 0.003833 m^2/s Momentum flux m0 = 0.012740 m^3/s^2 Buoyancy flux ----------------------------------------------------------------------------- j0 = 0.000644 m^3/s^3 DISCHARGE/ENVIRONMENT LENGTH SCALES: LQ 0.00 m Lm = 18.07 m LM 1.65 m lm' = 99999 m Lb' = 99999 m La = 99999 m UNSTEADY TIDAL SCALES: To = 0.5736 hours Lu = 34.94 m Lmin= 6.46 m (These refer to the actual discharge/environment length scales.) ----------------------------------------------------------------------------- NON-DIMENSIONAL PARAMETERS: Slot Froude number FRO = 251.73 Port/nozzle Froude number FRDO = 32.19 Velocity ratio R = 125.19 ----------------------------------------------------------------------------- MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS: Toxic discharge = no Water quality standard specified = yes Water quality standard CSTD = 1 ppb Regulatory mixing zone = no Region of interest = 3050 m downstream HYDRODYNAMIC CLASSIFICATION: -------------------------- I FLOW CLASS = MU4 I ------------------------ This flow configuration applies to a layer corresponding to the full water depth at the discharge site. Applicable layer depth = water depth = 1.83 m Limiting Dilution S = (QA/QO)+ 1.0 = 118.3 MIXING ZONE EVALUATION (hydrodynamic and regulatory summary): ----------------------------------------------------------------------------- X-Y-Z Coordinate system: Origin is located at the BOTTOM below the port/diffuser center: 54.86 m from the right bank/shore. Number of display steps NSTEP = 50 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 = 0.7789 ppb Dilution at edge of NFR s = 12.8 NFR Location: x = 22.86 m (centerline coordinates) y = 135.55 m z = 1.83 m NFR plume dimensions: half -width (bh) = 24.85 m thickness (bv) = 1.83 m Cumulative travel time: 515.6620 sec. WARNING: The LIMITING DILUTION (given by ambient flow/discharge ratio) is = 0 This value is below the computed dilution of 12.84 at the end of the Near Field Region (NFR). Mixing for this discharge configuration is constrained by the ambient flow. Please carefully review the prediction file for additional warnings and information. ----------------------------------------------------------------------------- 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 diffuser 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 ALREADY IN NEAR -FIELD at 0 m downstream and continues as vertically mixed into the far -field. ----------------------------------------------------------------------------- PLUME BANK CONTACT SUMMARY: Plume in bounded section does not contact bank. ----------------------------------------------------------------------------- UNSTEADY TIDAL ASSESSMENT: Because of the unsteadiness of the ambient current during the tidal reversal, CORMIX predictions have been TERMINATED at: x = 13.69 m y = 81.18 m z = 0.91 m. For this condition AFTER TIDAL REVERSAL, mixed water from the previous half -cycle becomes re -entrained into the near field of the discharge, increasing pollutant concentrations compared to steady-state predictions. A pool of mixed water formed at slack tide will be advected downstream in this phase. ************************ TOXIC DILUTION ZONE SUMMARY ************************ No TDZ was specified for this simulation. REGULATORY MIXING ZONE SUMMARY *****•*+*+*+*+*+*+**.*+ No RMZ has been specified. However: The ambient water quality standard was encountered at the following plume position: Water quality standard = 1 ppb Corresponding dilution s = 10.0 Plume location: x = 6.10 m (centerline coordinates) y = 36.18 m z = 0.81 m Plume dimensions: half -width (bh) = 16.69 m thickness (bv) = 1.22 m ********************* FINAL DESIGN ADVICE AND COMMENTS ********************** CORMIX2 uses the TWO-DIMENSIONAL SLOT DIFFUSER CONCEPT to represent the actual three-dimensional diffuser geometry. Thus, it approximates the details of the merging process of the individual jets from each port/nozzle. In the present design, the spacing between adjacent ports/nozzles (or riser assemblies) is of the order of, or less than, the local water depth so that the slot diffuser approximation holds well. Nevertheless, if this is a final design, the user is advised to use a final CORMIXI (single port discharge) analysis, with discharge data for an individual diffuser jet/plume, in order to compare to the present near -field prediction. ----------------------------------------------------------------------------- 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 +-50o (standard deviation). As a further safeguard, CORMIX will not give predictions whenever it judges the design configuration as highly complex and uncertain for prediction.