Theo,

Thanks for the inerest. I am on dial-up so pictures are a bit tough. I had thought about adding an elbow (don't need a riser cause I'll get more that 18 inches with just the elbow). I am worried that without the bevel on the 15-inch pipe that the elbow won't slide on. I have never worked with PVC pipe this large. I also was worried that with the openning facing up, that the outlet might pull too much air during flooding (whorlpool effect), causing the drain to carry less water and putting too much flow through the emergency spillway. I was hoping that somebody made something specific for this like a plastic box that fit over the pipe. Any suggestions on how to locate local suppier for the elbows?