(a) A roof drainage system shall be provided for all structures in excess of 150 square foot of floor area.
(b) The roof drainage system shall consist of gutters located at the low point of each roof. The gutter shall carry drainage into a downspout. The sizing for the gutter and downspout system shall comply with the plumbing code. The gutter and downspout system shall discharge into a minimum four-inch (4") diameter poly-vinyl chloride conduit meeting ASTM F789, ASTM 3034 or SDR 35 with solvent welds which will carry the drainage to a centralized storm sewer system via a gravity means, unless otherwise approved pursuant to subsection 304.7 of Chapter 1309.05. The pipe shall be bedded with a minimum of two inches (2") of #57 gravel or washed stone and backfilled to within one foot of finished grade with #57 gravel or washed stone.
(c) Where a centralized storm sewer system is not available the roof drainage system shall discharge in a method approved by the City Engineer and the Building Commissioner.
(Ord. 76-2008. Passed 12-9-08.)