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133A: Dams to which subpart 7 provisions apply
or “This part of the law explains which rules apply to different types of dams.”
You could also call this:

“This explains how to measure how tall a dam is in different situations.”

You need to know how to measure the height of a dam for this law and any rules made under it. The height is always measured from the top of the dam, but where you measure from the bottom depends on the type of dam:

If the dam is across a stream, you measure from the natural stream bed at the lowest downstream edge of the dam.

For a dam that’s not across a stream, you measure from the lowest point at the edge of the dam.

If it’s a canal, you measure from the bottom of the canal.

This way of measuring applies to all dams covered by this part of the law.

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Next up: 133C: Obligation to notify regional authority of classifiable or referable dam and change of ownership

or “You must tell your local council about big dams you own and if you sell them to someone else.”
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Part 2 Building
Safety of dams: Dams to which provisions of this subpart apply

133BMeasurement of dams

  1. For the purposes of this Act and any regulations made under it, the height of a dam is the vertical distance from the crest of the dam and must be measured,—

  2. in the case of a dam across a stream, from the natural bed of the stream at the lowest downstream outside limit of the dam; and
    1. in the case of a dam not across a stream, from the lowest elevation at the outside limit of the dam; and
      1. in the case of a canal, from the invert of the canal.

        Notes
        • Section 133B: inserted, on , by section 38 of the Building Amendment Act 2013 (2013 No 100).