Department of Natural Resources - Classification and Design of Dams, Dikes, and Levees - Requirements for drains and other pipe conduits.

Published: 2018-05-24

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(A) Unless specifically exempted by the chief, dams in class I, class II, and class III shall include a device to permit draining the reservoir within a reasonable period of time as approved by the chief. Pipe conduits used for lake drains shall have a minimum inside diameter of not less than four inches and must be placed at an elevation to account for sedimentation in the reservoir.

(B) Valves or sluice gates in pipe conduits shall be installed upstream from the centerline of the dam unless otherwise approved by the chief.

(C) All pipe conduits used as drains, water supply lines, or other pressure-flow conduits, regardless of classification of the dam, shall meet the requirements of paragraphs (A), (B), (C), and (E) of rule 1501:21-13-04 of the Administrative Code and paragraphs (A), (C), and (D) of rule 1501:21-13-05 of the Administrative Code.

(D) When the drain outlets into a pipe-conduit upstream from the centerline of the dam, seepage control devices may be omitted from the drain.

(E) All new dam construction shall include a bulkhead for the outlet works unless specifically exempted by the chief.