§ 11-142. Headwalls, drop inlets and junction boxes.

(a)

All drainage structures shall be constructed of reinforced concrete.

(b)

The minimum thickness of reinforced concrete walls, floors, and tops shall be six (6) inches.

(c)

Concrete drainage structures shall be constructed with reinforcing steel having a maximum spacing of twelve (12) inches on centers and a minimum size of #4 bar.

(d)

Concrete bottoms for structures shall be poured at least twenty-four (24) hours prior to beginning construction of the vertical walls.

(e)

Junction boxes shall have a minimum interior dimension of four (4) feet.

(f)

Walls shall be constructed to form a tight joint with the floor and around the inlet and outlet pipes. The pipes shall be flush with the inside surface of the wall.

(g)

Unless otherwise directed by the County Road Superintendent, all drop inlets, box culverts and junction boxes shall have two-inch to three-inch weep holes at the subgrade elevation.

(h)

Headwalls shall be constructed on the upstream and downstream sides of the storm drainage system where no other drainage structures are required, or flared end sections may be used when approved by the County Road Superintendent.

(Ord. No. 91-9, Art. 1, § 5.03, 4-11-91; Ord. No. 99-32, Art. 1, 7-8-99)