Administrative Rules of Montana
Department 36 - NATURAL RESOURCES AND CONSERVATION
Chapter 36.14 - DAM SAFETY
Subchapter 36.14.2 - Hazard Classification
Rule 36.14.208 - DAMS IN SERIES
Universal Citation: MT Admin Rules 36.14.208
Current through Register Vol. 18, September 20, 2024
(1) The worst case scenario shall govern for determining the hazard classification of dams in series where more than one mode of failure is possible among the dams. Classification shall be based on potential for failure under combined and, if applicable, individual dam breach scenarios.
(2) The upstream dam must be classified as a high-hazard dam if:
(a) an upstream dam has
the capability to create failure in a downstream high-hazard dam because of its
failure flood wave; or
(b) the
failure flood wave of the upstream dam will likely cause a loss of life, with
or without failure of the downstream dam.
(3) Wastewater ponds that are separated by internal berms are not considered to be dams in series.
85-15-110, MCA; IMP, 85-15-209, MCA;
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