Yes, there should be some sort of structure that allows the flow to be slowed. You have to slow it down to a point where drainage is gradual, not fast-moving like the systems we see now. At that point, you will see a difference in the fish habitat and the stocks as they manage to spawn and manage to come back to the lakes.
Those are some of the issues that were brought to our attention. When you put rock formations in the bottom of the drains and build them up, that slows some of the water. I've seen them built in some of the rivers. They've done a tremendous job in slowing the velocity of the water, and that allows fish to migrate. With these fast-flowing drains, there's such a velocity of water coming through that some fish can't make it to the point where they want to spawn. So you have to slow down the drainage with the rock formations.