Alt 2-6d is not the only in-channel alternative

In our last post we disclosed the reasons why we eliminated Alternative 1-1 from further consideration. Cost was a big factor, but the main reason is the lower probability involved with Alt 1-1’s ability to pass fish.

Passing fish is the primary purpose of this fish-passage project, so we must succeed in that effort. And success in this case requires a full-river width in-channel fish passage.

We understand higher water levels are important to the community. It’s worth pointing out that we did consider another alternative with a full-river width fish passage that holds water higher than the recommended plan. It is also much more affordable than Alt 1-1. This brief post is intended to use the below illustration to compare water levels between Alt 1-1, which is no longer considered, Alt 2-6a, the highest full-river width fish passage in our final alternatives, and Alt 2-6d, our recommended plan.

We didn’t recommend Alt 2-6a because our models indicated the higher weir height would occasionally cause nuisance flooding. The shallow inundation would occur on a number of parcels of farmland and some forested areas upstream of the lock and dam. There’s nothing that prohibits this kind of inundation, but the non-federal sponsor would be required to mitigate the impact. The mitigation would involve working with local officials to obtain any lands, easements, rights-of-way or relocations if necessary.

~Russell Wicke, Corporate Communications

About US Army Corps of Engineers Savannah District

The U.S. Army Corps of Engineers Savannah District oversees a multimillion dollar military construction program at 11 Army and Air Force installations in Georgia and North Carolina. We also manage water resources across the Coastal Georgia region, including maintenance dredging of the Savannah and Brunswick harbors; operation of three hydroelectric dams and reservoirs along the upper Savannah River; and administration of an extensive stream and wetland permitting and mitigation program within the state of Georgia. Follow us on Twitter @SavannahCorps and on Facebook.com/SavannahCorps
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