Expert Diversion Panel: State has all information needed to make decision on advancing diversions
By: Alisha Renfro, Staff Scientist, Restore the Mississippi River Delta Coalition, National Wildlife Federation
Sediment diversions are restoration projects that carry sediment and water from the river through a gated structure on the levee into nearby basins, mimicking the way the Mississippi River once built much of southeast Louisiana. This type of project was identified in the 2012 Coastal Master Plan as a vital tool for far-reaching and long-lasting restoration of our coastal wetlands. Four sediment diversion projects from the Coastal Master Plan –Mid-Barataria, Mid-Breton, Lower-Barataria and Lower Breton – are currently moving forward in either planning or engineering and design. This fall, the state is expected to announce which sediment diversion projects they will continue move forward into full engineering and design.
Data collection and modeling efforts allowed the state to study and understand the full benefits that a sediment diversion could provide to our coastal wetlands and to anticipate the influence of the project on water levels, fisheries and salinity distribution in the receiving basins compared to future conditions without sediment diversions. In addition to those studies, an Expert Diversion Panel on Planning and Implementation – an independent group from outside of Louisiana with expertise in natural science, social science and engineering – was convened by the Water Institute of the Gulf to provide advice and guidance to CPRA on plans for sediment diversion projects.
The fifth meeting of this panel, held in August, focused on the state’s approach to using the data and modeling information to decide which sediment diversion projects will move forward. On September 16th, the Expert Panel released its report from that meeting, agreeing that the state had the information it needed to decide which sediment diversion projects to advance. The panel also decided that the socio-economic analysis and the work being done to predict the effect of diversions on the basins are appropriate for this stage of the process.
In the panel’s opinion “no other environmental restoration project in the nation has come so far so quickly.” The state’s decision on which sediment diversion projects to focus its efforts on and move into engineering and design is important, as it is one step forward in a longer process towards full implementation. Using sediment diversions to put the sediment of the river back to work for us is crucial for restoration and one the best tools we have to create a sustainable future for Louisiana.
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