Jim, When my pond was dug I had the contractor dig a silt hole where most of the water would enter it. The theory was to allow the water a chance to slow down and pool to give the sediment a chance to settle before flowing into the pond. Looking back I guess I should have gotten them to dig a few of them in a row with one being near the bottom of the pond to collect the sediment. If you have access to a backhoe it wouldn't take long to dig a few small silt holes. Just a thought.
