I know this my first post here ( I have been at Garden Web and Pool solutions off & on for some time) but this not Spam! I just saw this over at the Garden Web Forum, it's a deck drain product that can be fit to a radius. Could come in very handy in some situations...
http://www.quakerplastic.com/3-inch-radius-water-hog-drain-pool.html
http://www.quakerplastic.com/3-inch-radius-water-hog-drain-pool.html