fishin gal---EW is correct--both 4inch and 6 inch are available in 100'rolls---you may have to call around to find it--try landscape companies as well. i used some 6 inch to lay pipe under a road to feed a spring to my pond--one caveat--inspect it closely--my 100'ft roll (i believe was around $60) looked pretty good---- but i had an extra 40ft the guy "gave" me that had several splits in it and the couplings are crap. i think before i cut my dam i would experiment with $25 to $75 worth of this type pipe in a single roll. if time isn't a problem go 4 inch. you can put hardware cloth across the face of the pipe and keep it cleaned off to prevent blockage---i am curious how you would start this siphon? GPR
