Sediment buildup is a well known problem with ant dam. An interesting book I have on the history of dams has a picture of an ancient Roman dam in spain - the dam is filled to the top of the wall, and the stream has cut a new channel through this flat land and down through the dam wall almost to the base of the dam. The surrounding flat is used as a successful orchard!
Many dams are set up with a floodgate near the bottom which can be opened periodically to flush the mud downstream.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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