Hi All! So I live in Southeast Alaska. We get an insane amount of rain... Like way way way more then Seattle. I have just about finished my duck run, and have come to a indecision. My yard is all gravel, all the way down to the bedrock. It still has drain issues, so I built my run with a tall frame around the bottom. I then filled with rocks and then gravel on top of that. I now have about 7 inches of space to fill with what ever I decide to finish off the run with. Half of the run has a roof over it so they can get out of the driving rain if they want with out going in their house. The other half is open to the elements and also will have a raised pond for them to swim in. I was planning on using sand as the final layer, but now like I said am not sure. The internet it seems is about 50/50 on each side of whether it is good or not. We use our yard a lot and want the ducks to not stink it all up and drive us out of there or make our neighbors mad... and do not want to end up with a muddy mess. Plus my daughter is very allergic to hay so thats out. And everything has to be shipped in by barge because we live on an island which drives prices up pretty far. I'm not apposed to bringing in some soil. I could put some weed barrier on top of the gravel and then the dirt so they don't mix and the drainage would hopefully work...... thanks in advance!