Stush my pots get flushed every summer. When it rains I have to tip them and pour the water out. I also do not have problems with over water in the summer because I do not do single plant pots. My pots are combo pots with lots of plants fighting for their share of the drink in a pot.
We had so much rain this summer I finally had to put them on their side so they did not drown. It was the first time I can remember kicking myself for not having drainage.