N.D. Cent. Code § 24-06-26.3
The board of township supervisors may authorize any private party to maintain, clean, or shape a ditch along a township road at that party's own expense and in accordance with this section. In maintaining, cleaning, or shaping a ditch, the private party may not spread any soil or debris from that ditch along adjoining land without the permission of all parties with an interest in that land. The ditch may be on a continuous grade from the bottom of the upstream water outlet to the bottom of the downstream water outlet structure. The grade ratio in that distance must be a slope that, in light of the soil types and potential for vegetative cover in the ditch, will resist erosion. In order for any action to be considered maintenance of a ditch in accordance with this section, the ditch must be entirely contained within the township right of way, must have a bottom that is not wider than twelve feet [3.66 meters], and may not alter the side slope of the ditch to a slope steeper than the existing side slope. The board of township supervisors may not approve private maintenance of a ditch that does not comply with the standards of this section. If the board of township supervisors denies permission to maintain a ditch under this section, the petitioner may appeal that decision to the water resource board that has jurisdiction over the ditch. This section does not relieve any person from compliance with any requirements for a drainage permit which are required by statute or rule.
N.D.C.C. § 24-06-26.3