Advocacy groups interested in Lake Lanier’s waters are looking at putting in another two cents’ worth on the U.S. Army Corps of Engineers’ updated management document for the Apalachicola-Chattahoochee-Flint River Basin. “Every time we have an opportunity to comment on something like this, we try to do it,” said Sally Bethea, executive director of Atlanta-based Chattahoochee Riverkeeper. Bethea said she sees her group reiterating previously made points, such as making maximum water conservation and efficiency a top priority.