Roof drain number four connects to a three-inch roof drain serving one thousand fifty square feet and a three-inch overflow drain serving one thousand fifty square feet. The piping transitions to four-inch storm drain and four-inch overflow drain lines with a one percent slope, serving cumulative areas of two thousand one hundred and four thousand two hundred square feet.
ROOF DRAIN #4 3" RD-1 (1,050 SF) 3" OD-1 (1,050 SF) 4"SD(2,100 S.F) S=1% 4"OD(2,100 S.F) S=1% 4"SD(4,200 S.F) S=1% 4"OD(4,200 S.F) S=1%
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