Since this is going in an area that water flows through when it rains hard, It has to do with how much water would be impounded with a dam. They said if a dam would impound more than three feet depth of water (I believe relative to the current depth of the draw) we would need a designed spillway, and the dam will need to be compacted a certain way. If less than 3 ft of water would be impounded, it would be considered a pit pond and I only need to "designate" an area for the emergency spillway, and the dam can just be fill dirt extending into the lower portion of the draw.
If I set the water level where I intend by constructing a dam, I will be impounding about 4 1/2 ft of water before any excavation.
Randy
