N.D. Cent. Code § 61-16.1-50: Drains having a common outlet may be consolidated

Whenever one or more drains which have from time to time been constructed, empty into a drain that supplies the outlet for waters flowing in all such drains, such drains may by resolution or order of the water resource board, if the cost of construction of such drains has been paid, be consolidated into one drain or drainage system and shall be renumbered and may be renamed.