Monitoring observation localization forGeheyan Project in 1998 flood season was the deep outlets, the surface spillway, the still basin and auxiliary energy dissipators.
Opening the spillway will redirect floodwaters from the Mississippi River through the Atchafalaya River Basin, which runs between Baton Rouge and Lafayette south toward Morgan City.
Louisiana state and local officials braced for the possibility of major flooding in the Atchafalaya River Basin if, or when, federal authorities open the spillway north of Baton Rouge.