§ 1.2.3. Street Drainage

A.

No lowering of the standard height of street crown shall be allowed for the purposes of obtaining additional hydraulic capacity.

B.

For non-curbed streets all flows for the 100-year frequency storm shall be contained within paralleling roadside ditches, medians, drainage channels or other drainage facilities located within public rights-of-way or drainage easements.

C.

No outlet structures from stormwater management facilities, groundwater collection, parking detention, or other improvements discharging concentrated flows shall be designed to discharge concentrated flow directly onto arterial or collector streets. For local streets, no concentrated discharge from sites larger than 0.25 acres shall be permitted. All concentrated discharges shall be conveyed by a closed conduit to the nearest existing storm drain.

D.

Concentrated discharge across a sidewalk area will not be allowed. A channel section can be used under the sidewalk area, provided the outlet device utilizes sheet flow methods, maintains a minimum three (3) foot horizontal separation from all utility infrastructure, and it is covered by a method approved by the Public Works Department.