portabuddy;1011040; said:the problem is when it doesnt move enough water..., then you have flodding isues., also this is why people intigrate a ball valve into there overflows, to controle the flow...
Actually, that is backwards. A system designed like that will flood when the power is shut off.
The overflows need to flow more water than the pump can push. Progressively smaller pumps all the way to zero flow will not cause flooding. This is a requirement for well designed systems to survive power outages.
Another requirement is that the system must start back up without your help when the power is restored.