Section 89-05-01-05 - Design criteria1. Dikes shall be constructed so as not to cause an increase in the elevation of floodwaters which will result in an unreasonable increase in flood damages due to the displacement of floodwaters. However, in no event shall dikes, based on total encroachment, increase the elevation of floodwater of the one hundred year frequency flood of more than one-half foot [15.24 centimeters]. 2. Calculation of the effects of proposed dikes shall be based on the dikes being located on both sides of the Red and Bois de Sioux Rivers so as not to cause more than one-half of the maximum allowable stage increase. If mutual agreement has been reached between persons on both sides of the river, dikes on one side of the river may utilize the entire increase in flood stage elevation allowable. 3. Dike dimensions. Dike top widths shall not be less than six feet [1.83 meters]. Side slopes shall not be steeper than 3:1, except whose slope stability analysis and slope erosion control can justify steeper slopes. No organic soil or material shall be allowed in the foundation of the fill of dikes. 4. Vegetative cover and riprap. A protective cover of grasses shall be established on all exposed surfaces of the dike. Riprap shall be used where required for control of erosion. 5. Interior drainage. Dikes shall have provisions for interior drainage. The design shall include plans to handle the discharge from the drainage area based on drainage design requirements for the local area. N.D. Admin Code 89-05-01-05
Effective August 1, 1980.General Authority: NDCC 28-32-02, 61-03-13
Law Implemented: NDCC 61-16.1-38