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Mid-Breton Sediment Diversion

Louisiana is facing significant coastal land loss due to multiple factors along the Mississippi River

  • 500

    Water Samples Taken

  • 50K

    CFS Diverted

  • 10

    Miles River Bottom Surveyed

  • Plaquemines Parish, Louisiana

    Plaquemines Parish, Louisiana

Saving the Louisiana coast and essential wetlands through restoration of the Breton Sound

Historically, sediment-rich water overflowed the banks of the Mississippi River and moved through coastal Louisiana, nourishing healthy wetlands. However, the construction of levees along the lower Mississippi River has since prevented those flows. Resulting subsidence, combined with several other factors, results in the loss of a football field of land every 100 minutes. The purpose of the Mid-Breton Sediment Diversion project is to again divert the sediment-laden Mississippi River waters back into the Breton Sound Basin.

A gated diversion system is being designed to divert approximately 50,000 cubic feet of water per second, or 5 percent of the Mississippi River during high flows, through existing levees to the Breton Sound. A suite of 3D computer models and a physical model are being used to help determine the location of the inlet and the configuration of the corridor through which the diversion system will operate. Water quality modeling is being performed using Delft3D and hydraulic and sediment transport analyses are being performed using HEC-RAS, MIKE21, FLOW-3D, Delft3D and ADCIRC.

This project is considered key to reversing coastal land loss. Upon completion, an estimated 67,500 acres of marsh will be restored, sequestering around 24,000 tons of carbon each year.

At a Glance

Offices
Client
Coastal Protection & Restoration Authority (CPRA)
Meet Our Team

David Hayson, Senior Project Engineer

Water is a powerful force that shapes our landscape. Every stream, watershed, and problem/solution is unique.

Matthew Hoy, Senior Principal

My passion lies in using hydraulic models to support large water resources projects that make the world a safer and more sustainable place.

Bret Lavey, Senior Principal, Operations Leader

I enjoy being part of a team that makes water safer in our communities by cleaning up our waterways and protecting people from floods.
Bret Lavey Senior Principal, Operations Leader Read More

Steve Mathies, Global Practice Leader, Coastal Restoration

I am a native of Louisiana—coastal land loss is a very personal tragedy. Being a passionate advocate for restoration and proactively engaging with the community has been the hallmark of my career.
Steve  Mathies Global Practice Leader, Coastal Restoration Read More

John Montgomery, Senior Vice President, Director of Water Strategic Growth

No resource is more important than clean water. We all share a responsibility to manage it in an appropriate and effective way.
John Montgomery Senior Vice President, Director of Water Strategic Growth Read More

Hilary Thibodeaux, Principal, Senior Project Manager

With increasing coastal issues, I’m proud to deliver innovative and quality coastal projects to protect communities and reduce land loss.
Hilary Thibodeaux Principal, Senior Project Manager Read More

Ryan Waldron, Coastal Engineer

I feel tremendous pride when I work on a project that restores or protects our fragile and beautiful landscape.

David Hayson

Senior Project Engineer

Matthew Hoy

Senior Principal

Bret Lavey

Senior Principal, Operations Leader

Steve  Mathies

Global Practice Leader, Coastal Restoration

John Montgomery

Senior Vice President, Director of Water Strategic Growth

Hilary Thibodeaux

Principal, Senior Project Manager

Ryan Waldron

Coastal Engineer

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