Roof drain number twelve connects to a three-inch roof drain type one and a three-inch overflow drain type one, each serving nine hundred square feet. The three-inch overflow drain and three-inch secondary drain each run with a slope of one percent for nine hundred square feet. The combined secondary drain continues downward with a total tributary area of eighteen hundred square feet.
ROOF DRAIN #12 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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