Pond Boss Forums POND CONSTRUCTION Selecting a site Pond site found, need more advice

An easy coffer dam that someone on the forum has used was to stack several bags of concrete (just leave it in the bag) across the stream to create a pool. The water flows over the top of this type deal.
The top of the coffer dam will be the level of your pond pool. The water it holds in the stream will equalize to the same level in your pond through the pipe.
I suggested putting the pipe a foot under water level thinking that might be deep enough to avoid freezing.
Fix it so the stream can't get into the pond during flooding (except for the pipe).
With no water flowing through the pond there will be practically no siltation.