A private tri-state water group has worked several years to find a water-sharing solution in the Apalachicola-Chattahoochee-Flint River basin that includes Lake Lanier, something that has eluded Georgia, Alabama and Florida for two decades. But it appears the ACF Stakeholders has reached a watershed moment of its own, one that could have implications in future water management of the basin. The group’s governing board, meeting Wednesday and Thursday at Lake Blackshear near Cordele in South Georgia, is set to decide whether a basinwide study should be kept under wraps until work on the crucial document is finished.