The more questions you ask, the more of a hard time you're getting... I think providing the best possible care for your chickens is what you're trying to do. In this case, in order to keep this open part of your 'coop' dry, the only option here is to remove the drain spout to a different area. This area would be considered a run in any other situation, but considering the size of your actual 'coop' (the closed in area where your chickens sleep and nest), I'm considering this open area part of the coop. You should do whatever you have to to keep this dry as well.