Storm Drainage System Rehabilitation

The County maintained storm drainage conveyance system consists of over 1,300 miles of pipe segments and appurtenant structures. The pipes range in size from 12-inch diameter up to 84-inch diameter. Most pipe is round, but occasionally have elliptical and arch pipes. It is estimated that about 50% of the storm pipes are 15-inch diameter or smaller. The pipes can range from 4-feet to 25-feet deep. The average pipe segment is approximately 6 feet deep and 105 feet in length from structure-to-structure (or to the end of the pipe). Each pipe segment lies within a dedicated storm drainage easement or partially within a Virginia Department of Transportation Right-of-Way. An average of 1.8 miles of storm drainage pipe have been lined annually over the past 3 years and this is expected to continue.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.