A four-inch roof water leader and a four-inch overflow drain transition into six-inch horizontal and vertical piping runs. Each drainage line serves a tributary area of thirteen thousand one hundred sixty square feet. An invert elevation of minus five feet one inch is marked on the lower branch.
J 1 J 1 6"RWL 13,160 SQ. FT. 4"OFD 4"RWL 6"OFD 13,160 SQ. FT. IE: -5' -1" 1 3
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