Roof drain number eleven connects to a three-inch roof drain pipe serving nine hundred square feet and a three-inch overflow drain pipe serving nine hundred square feet. The three-inch overflow drain pipe runs at a one percent slope and serves nine hundred square feet. The three-inch sanitary drain pipe runs at a one percent slope and serves nine hundred square feet before combining into a combined three-inch sanitary drain pipe serving one thousand eight hundred square feet.
ROOF DRAIN #11 3" RD-1 (900 SF) 3" OD-1 (900 SF) 3"OD(900 S.F) S=1% 3"SD(900 S.F) S=1% 3"SD(1,800 S.F)
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