North Dakota Administrative Code
Title 37 - Department of Transportation
Article 89-14 - Stream Crossings [Rules adopted jointly with Water Commission and published in Article 89-14]
Chapter 89-14-01 - Stream Crossing Design
Section 89-14-01-05 - Allowable headwater
The allowable maximum headwater when passing the design discharge must be measured from the bottom of the channel. For arch pipes, the maximum allowable headwater must be based on the rise of the pipe, and the pipe size category must be the equivalent round pipe size. For multiple pipe installations, the pipe diameter used to calculate the allowable headwater must be the diameter of the largest pipe. Tailwater resulting from downstream conditions, either natural or manmade, must be accounted for in the determination of the crossing's capacity and the resulting headwater. Additional guidance is provided in the North Dakota department of transportation design manual.
General Authority: NDCC 24-02-01.1, 24-02-01.5, 28-32-02, 61-03-13
Law Implemented: NDCC 24-03-06, 24-03-08, 24-06-26.1
