I was thinking the same thing. That looks like with the terrain there is going to be a LOT of flow through. In our area, if it drains over a certain size watershed, we need Corps of Engineer approval before damming up such a stream.
That is going to take a significant structure to stand up to a heavy rain event. Concrete overflow area so it will not erode of adequate size to handle any rain event and surrounding higher dam high enough so it is never breached and all the water is forced to flow over the concrete. That is the way I would approach it. Otherwise it takes a lot of freeboard on the dam to temporarily hold the water till it has time to meter out the overflow pipe (like a watershed containment structure). That takes a significant dam to withstand the temporary pressure during high water events.
No expert here. Just the way I see it.
Last edited by snrub; 02/05/16 07:39 AM.
