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DREDGED FINE PARTICULATE CONTROL
2016
Engineering and Design Challenges:
Extreme Turbidity Limitation: <29 NTUs within 30 ft and <1 NTU into Biscayne Bay
Extremely dispersible fine clay particles; sudden, significant high flows
Design for ability to use, move and reuse
Dive inspections not possible due to the presence of crocodiles.
Solutions:
3-Barrier System Design:
Diversion Barrier to blunt the flow forces and dissipate jet flow
Bottom-Sealed Filter Barrier, anchored on shore, to settle and filter out larger turbidity particles and to reduce and diffuse fine clay particles
Outermost silt curtain, off the bottom, to allow greater time for particle settlement plus diffusion
Computational Fluid Dynamics modeled flow analysis
Innovative self-anchoring system, removing the need for divers to enter the water
The primary filter barrier and outer silt curtain both had reefing capabilities which allowed depth adjustments and assisted with movement of the systems from one creek site to the next without removing them from the water
Outcome:
Water quality results in compliance throughout the project duration, both near the barriers and in adjacent Biscayne Bay
No significant operational challenges
The contractor was able to reef, move and redeploy using an Operations Plan