American Eco Systems’ Dispersion Modeling The 3-D round surround funneling out InvisiHead flow dispersion

US EPA VISUAL PLUME FLOW MODELING – AES MO715 

Running the US EPA Visual Plume Model For the ABTP Outfall using the InvisiHead system as the flow discharging and dispersing system

Dispersion Modeling for the 818 and 3923 MLD flows

The InvisiHead system diffuses the effluent in a round surround omindirectional 3-D funneling-out fashion. The diffuser releases the effluent at the 818 MLD average daily flow or 0.4508m3/s per InvisiHead diffuser port at a velocity of 0.018m/s or 18mm/s. The peak flow of 3923 MLD or 2.1621m3/s per InvisiHead diffuser port would be discharged at 0.088m/s. – super slow velocities that give a long residence time for the effluent to disperse, mix and blend with the receiving water body. Requirements are satisfied within the vicinity of the outfall structure. The dilution ratio passes 1000:1 at less than 4m away from the InvisiHead outlet as the US EPA VP modeling shows below.

The InvisiHead diffuser ports are capable of achieving the required mixing over the full range of effluent flows. There will be 21 InvisiHead diffuser ports. If all fixed to one row of vertical 21 risers and spaced at 15m C-C, the total length that would be occupied by the 21 ports would be 300m assuming the first port is located at the upstream end of the diffuser line (the tunnel) and ending at the downstream end at diffuser 21.

If on the other hand two offset risers are installed one on each side of the vertical riser that the three ports would be spaced at 15m C-C, the diffuser length would be reduced to 90 meters.

The use of the InvisiHead system would save a good amount of money. The total outfall project cost is estimated to be $284M (2014) to construct a linear diffusing system. The tunnel including the linear diffuser is about 3500m long. The diffuser line is 1000 m that would have 1000 risers spaced at about 16m. The cost per meter of the 3500m is a little over $81,000. If the InvisiHead is used, option I single row would reduce the diffuser line to 300m from the 1000m considered for the linear diffusers. The cost savings would be 700m x $81,000/m = $56.8M. The InvisiHead diffusing line would be 300m long.

If option II of offset riser – one on each of the vertical row - is used the diffusing line would be further reduced to 100m. The cost savings would be about $73M

As the hydraulics, the head loss in the InvisiHead at peak flow is negligibly low at 0.00017m.

The dilution at the edge of the mixing zone meets and exceeds the 79:1 required to meet the PWQO which is higher than the 20:1 minimum dilution requirement. That can clearly be seen at modeling runs shown below: the first is for the 818 MLD average flow and the other is for the 2923 MLD peak flow*.

*The Dispersion Modeling is done by the American Eco Systems, LLC

American Eco Systems’ Dispersion Modeling The 3-D round surround funneling out InvisiHead flow dispersion

US EPA VISUAL PLUME FLOW MODELING – AES MO715 

The data used for the effluent dispersion modeling are as follows:

Ambient Salinity (TDS): 223 ppm

Ambient Temperature 3.4°C

Outfall Flow: 818 MLD daily average and 3923 MLD peak

Outfall Salinity (TDS): 223ppm

Outfall Temperature 18.5°C Spring temperature

Current velocity 0.05m/s

Current direction 320° assumed

AES welcomes the client’s feedback and any flow and ambient data modifications and adjustments if required.

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