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153: Meaning of dangerous dam
or “A dangerous dam is a high or medium impact dam that might break during normal times, a not-too-big earthquake, or a not-too-big flood.”
You could also call this:

“Explains how dams are classified as risky in big earthquakes or floods based on their size and chance of breaking”

A dam is considered earthquake-prone if it meets two conditions. First, it must be classified as either a high potential impact dam or a medium potential impact dam. Second, it must be likely to fail during an earthquake threshold event. The specific definition of an earthquake threshold event is provided in the regulations.

Similarly, a dam is considered flood-prone if it also meets two conditions. Like earthquake-prone dams, it must first be classified as either a high potential impact dam or a medium potential impact dam. Additionally, it must be likely to fail during a flood threshold event. The specific definition of a flood threshold event is also provided in the regulations.

These definitions are important for understanding which dams might be at risk during earthquakes or floods. They help identify dams that may need extra attention or safety measures to protect people and property.

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Next up: 153AA: Buildings in areas designated under subpart 6B

or “Rules for unsafe dams in special areas still apply to actions taken before the area was made special”
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Part 2 Building
Safety of dams: Dangerous dams

153AMeaning of earthquake-prone dam and flood-prone dam

  1. A dam is an earthquake-prone dam for the purposes of this Act if the dam—

  2. is a high potential impact dam or a medium potential impact dam; and
    1. is likely to fail in an earthquake threshold event (as defined in the regulations).

      1. A dam is a flood-prone dam for the purposes of this Act if the dam—

      2. is a high potential impact dam or a medium potential impact dam; and
        1. is likely to fail in a flood threshold event (as defined in the regulations).

          Notes
          • Section 153A: inserted, on , by section 32 of the Building Amendment Act 2008 (2008 No 4).