Strong Current Dredging Project

Location:

Biscayne Bay, Watson Island, Miami, Florida

Project Overview:

Contain bucket dredge sediments within several work zones exposed to high tidal currents, limit sediment migration at several defined mitigation areas, adjacent Miami Cruise Ship Terminal with requirement for frequent barge traffic. Provided 30,300’ of Heavy Duty Type 3 curtains along with specialty turbidity curtains in assigned project areas.

ABASCO Contribution

Product Design: manufacture & installation support

TYPE 2 DOT with 3/8” chain used in interior mitigation areas
TYPE 3 HD with ½” chain used in primary dredge area and outer mitigation
TYPE 3 HD with additional belting in primary dredge area
Custom heavy curtains – 35 oz PVC, 2 each ½” chains for high load areas
High tensile strength belting, D-rings and fasteners used on some higher load areas

Project Challenges and Features –

Type 3 HD and specialty curtains exposed to 4-5 knot currents
Strong winds up to 45mph
Release restricted to low NTU levels, multiple samplings per day
Pilings and deadweight anchors
Curtain restrictions related to Manatee movements
Dredge area, sponge/seagrass mitigation areas, and spoils area
Fine silt coral sediment in the dredge area (baby powder)
High profile location

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