We have to keep our ducks penned for several reasons. We originally started with what we thought was a reasonable dry spot in the yard. The ducks promptly turned that into 4 inches deep mud that refused to dry out. So we scooped out the mud and filled it in with small rounded gravel. No more mud but the yard around the pen is constantly flooded and the fence is rotting out from being wet all the time. So we've decided to move them to a different part of the yard where they'd be on a bit of a knoll and so will have better drainage. But we know they will turn the ground to mud again in no time. So what should we do for the ground there? Is gravel ok to do again? We've thought about concrete too since it is also very easy to clean well but it's expensive. Is concrete the best route though? We will try to spend the money if it's going to be the best route. Please share what your prefer for your ducks.