36.14.501    HIGH-HAZARD DAM DESIGN CRITERIA

(1) Designs for construction of high-hazard dams must conform to accepted practices and procedures of the engineering profession.

(2) Design as well as preparation of the construction plans and specifications must be prepared by or under the direction of an engineer experienced in dam design and construction.

(3) An earthfill dam must be safe and stable during all phases of construction and operation of the reservoir. To accomplish this, the following criteria must be met:

(a) the embankment must be safe against overtopping during occurrence of the inflow design flood by the provision of sufficient spillway and outlet works capacity;

(b) the slopes of the embankment must be stable during construction and under all conditions of reservoir operation, including rapid drawdown of the reservoir;

(c) the embankment must be designed so as not to impose excessive stresses upon the foundation;

(d) seepage flow through the embankment, foundation, and abutments must be controlled so that no internal erosion or piping takes place and so there is no sloughing in the area where the seepage emerges;

(e) the embankment must be safe against overtopping by wave action;

(f) the upstream slope must be protected against erosion by wave action, and the crest and downstream slope must be protected against erosion due to wind and rain;

(g) the design must be such that the most severe earthquake that can be reasonably anticipated will not cause catastrophic failure and loss of life; and

(h) construction of the dam and its appurtenants must be constructed utilizing proper methods and control.

History: 85-15-110, MCA; IMP, 85-15-210, MCA; NEW, 1988 MAR p. 2489, Eff. 11/24/88; AMD, 2022 MAR p. 1849, Eff. 9/24/22.