I am presently putting up a heated pole building to be used for winter dog exercising. I will have a few fences separating groups of dogs. I will pick up solid waste, but expect to hose off the sealed concrete floor daily for urine removal, as well as a bi-weekly power washing and sanitizing. I originally wanted to use channel drains all along the west, south and east perimeters of the building, each of which are 40' long. 4" channel seems to be too narrow, I can see the spray going back and forth over it, making the task more work than it should be. I don't know if I should put channel drain right up next to the wall (which will be waterproof) which would eliminate the back and forth problem, but 4" still seems too small to me anyway..... After pricing 8" or 12" channels, my jaw dropped through the floor, so I was trying to come up with alternatives. One of them would be to run 4" sewer pipe along the "run" with something like 12" PVC square drains tapping into the run every 10 ft.. The floor will slope 1/4" per 10ft. Is this a workable alternative to the channel drains? If so, then I'd probably choose it over continuous 4" channel. Thanks for your suggestions. ( I used this forum extensively while remodeling our home 5 years ago, without making a single post!! I have Toto toilets and they work great!!)