ML :

That is a term {water control gate} that is used in water control like flood gates. Duck hunter/farmers use them to control the water level in fields often by adding or taking out boards in the gate to control water levels. What I had in mind is a way to block the grow out pond from the main pond which are connected by a 6 ft. wide opening 4 ft. deep. The gate could be made out of chain link fence attached to a re-bar frame covered by netting if needed. I think I have seen more complicated control structures by PondBoss advertisers . ewest