North Dakota Century Code Title 11. Counties § 11-33.2-12.1. Contents of plat--Location and elevation of lakes, rivers, or streams--Notification of floodplain

Whenever land, subject to regulation under this chapter, abutting upon any lake, river, or stream is subdivided, the subdivider must show on the plat or other document containing the subdivision a contour line denoting the present shoreline, water elevation, and the date of the survey. If any part of a plat or other document lies within the one hundred year floodplain of a lake, river, or stream as designated by the department of water resources or a federal agency, the mean sea level elevation of that one hundred year flood must be denoted on the plat by numerals. Topographic contours at a two-foot [60.96-centimeter] contour interval referenced to mean sea level must be shown for the portion of the plat lying within the floodplain. All elevations must be referenced to a durable benchmark described on the plat with its location and elevation to the nearest hundredth of a foot [0.3048 centimeter], which must be given in mean sea level datum.