the monsson is upon us and my run is turning into a pond! Help!

I do have a sand floor in the run, so no mud, but it's getting quite water logged. Just today after and hour of hard rain and my hens are feet deep in water. The hen house is dry, thankfully, but doesn't have much room for walking around for all of them, some of them have gone into the nesting boxes for refuge. I just need a temporary fix to give them a dry floor just until the monsoon season is over in about a month.