If you are using the spillway to control the TSEL of the lake I would suggest Rip-Rap, a quick calculation could be performed to determine the velocity of the outflow at some storm event, say 100 yr. then the Type Rip-Rap could be selected. If the velocity is less than 7 fps Rip-Rap that can be hand place will do just fine in GA thaat would be Type 2 Rip-Rap. It will actually keep down on any erosion.
Conversley if the spillway is an emergency overflow then grass would be great!
Last edited by heavies; 07/13/09 06:35 PM.
