We got a heavy rain last week that filled my coop with an inch of water. I have one pullet that loves to play in water and she was having a ball. the others however were not coming down off the roosts. I had caulked the flooring all the way around so it held water, I had to remove the door sill to let the water out. I may have to consider drains. First though I decided to try Bahama shutters to keep a lot of the water out ( I hope ). Built and installed them on the East and West sides first. If it works I will make some for the front (North side).