(A) Grass swales shall have a minimum gradient of 1%. Underdrains may be drained through a drop structure at the end of the channels or through a standard tile outlet. Tiles shall be bedded in granular materials that will not pass through the wall openings. Tiles shall be installed with a minimum of 12 inches of cover over the top of the tile and shall be offset from the centerline of the channel. Any cover less than 12 inches is subject to Plan Commission approval.
(B) Underdrains or storm sewers shall be provided in plan design for each lot to connect house storm sewer drains and sump pumps. No connection to street underdrains shall be allowed. No drainage of sump pumps or house storm sewer drains to street gutters shall be allowed.
(Ord. passed 10-11-2004)