Subsidence, erosion, channelization, saltwater intrusion, storm damages, and the
absence of freshwater, sediments and nutrients from the Mississippi River have all
caused significant adverse impacts to the White Ditch project area, resulting in
extensive wetland loss and ecosystem degradation. One of the objectives of this
project is to provide additional freshwater, nutrients, and fine sediment to the
area between the Mississippi River and River aux Chenes ridges. Additional objectives
include restoring functional hydrology and improving habitat conditions for fish
and wildlife.
The concept of a ‘medium diversion’ shall serve as a guide in designing the project
to meet stated goals and objectives. Through the feasibility study process, numerous
alternatives will be developed that implement the strategy of introducing freshwater,
nutrients and sediments into the project area. Additionally, supplementary features
such as weirs, culverts or beneficially using dredged sediments could be instituted
to provide further benefits. With the new structure(s), the introduction of additional
freshwater will facilitate organic sediment deposition, improve biological productivity,
and prevent further deterioration of the marshes. Existing features that could serve
as a guide in designing this project include the Caernarvon Diversion, the West
Bay Diversion and the Naomi Siphon.