27 CAR § 94-406 – Drainage

(a) Drainage in highway side ditches shall not be altered or impeded.
(b) When drainage structures are required, the size of the opening, the length, and the other design features shall be approved by the engineer, and in all cases the structure shall be no smaller than eighteen inches (18”) in diameter or equivalent pipe culvert.
(c) Pipe culvert shall be corrugated metal, reinforced concrete pipe, or other Arkansas Department of Transportation approved pipe, a minimum of twenty feet (20’) in length and shall have no hazardous headwalls or other hazards constructed upon it.
(d) No driveway shall be constructed with swale type ditches for drainage unless there is no other alternative and an exception is approved by the engineer.