§ 40-241. Roadside ditches, driveway culverts, and/or subsurface drainage.

(a)

Ditches shall have a maximum fore slope of 3:1 and a maximum back slope of 2:1 and shall be of such depth to receive pipe of such size as needed to provide proper drainage. The ditch shall have a minimum depth of two feet. In no case shall installation of pipe less than 18 inches in diameter in road ditches be allowed, nor installation of more than 75 feet of continuous pipe permitted; also a minimum gap for three feet shall be left between pipes to allow for cleanouts. All necessary cross culverts, culverts, bridges, etc., shall be installed and all lateral drainages completed with sufficient easements dedicated to allow for proper maintenance and repair. All of the foregoing shall be done according to specifications approved by the St. Martin Parish Government before the street(s) and appurtenances shall be accepted by the St. Martin Parish government for maintenance.

(b)

Driveway culverts and culverts not located under asphalt shall be one of the following:

(1)

Reinforced concrete pipe (ASTM C-76, Class III).

(2)

Bituminous coated corrugated steel pipe (Minimum 16 gage).

(3)

Plastic pipe (as approved by LA DOTD QPL List).

(c)

Pipes located under asphalt shall be one of the following: Reinforced Concrete pipe (ASTM C-76, Class III)

(d)

Pipes not located under asphalt for subsurface drainage shall be one of the following:

(1)

Reinforced concrete pipe (ASTM C-76, Class III).

(2)

Plastic pipe (as approved by LA DOTD QPL List).

(e)

All pipes/culverts shall be laid in accordance with the manufacturer's recommendations and having watertight joints. Backfill for reinforced concrete pipe and bituminous-coated corrugated steel pipe shall be selected soils or granular materials. Backfill for plastic pipe shall be granular material. A minimum of nine-inch cover shall be required over plastic pipe. Any pipes found to be damaged or out of alignment or grade shall be removed and reinstalled, or replaced at the expense of the owner.

(Ord. No. 05-11-0611-OR, 11-5-2005; Ord. No. 09-08-0856-OR, § I, 8-11-2009)