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Rule 23 Extensions of existing linear rock protection

Rule 23 Extensions of existing linear rock protection

Updated 13 May 2015 12:36pm

The placement of rock rip-rap along the river bank which extends an existing lawful continuous rock rip-rap structure that is fixed in, on, or under the bed of any river, including any associated:

  • disturbance of river or lake bed; or
  • deposition on the river or lake bed; or
  • diversion associated with the extension; or
    temporary diversion of water; which

(1) extends no more than 1 metre from the existing river bank; and

(2) adds no more than whichever is the lesser of;

  • 25% of the length of the existing rock rip-rap structure; or
  • 30 metres

measured from the structure existing at 25 January 1997 (the date the Proposed Plan was publicly notified); and

(3) disturbs sand, shingle, gravel, or other natural river or lake bed material over an area less than 2 square metres per lineal metre of structure measured along the length of the extension to the structure

is a permitted activity provided it complies with the conditions specified below.


(1) The rip-rap material shall be placed so that it forms a continuous interlocking pattern.

(2) The extension to the structure shall not cause any bank erosion and change to water levels.

(3) The rip rap is to be constructed of rock that is of sufficient size and grading to be erosion resistant, and that is also weather resistant, non-friable, insoluble, and so placed to ensure durability and stability of the structure.

(4) Fish passage shall be maintained during any construction activities and all works shall be undertaken in a manner that will provide for fish passage.

(5) In any part of the river or lake bed covered by water in any water body identified in Policy 4.2.14 (Appendix 4 - Water bodies with important trout habitat (click here for a pdf Important Trout Habitat (146k))), the activity shall not take place between 31 May and 31 August.

(6) No contaminants (including but not limited to oil, petrol, diesel, paint, or solvent) shall be released to water from equipment being used for the operation, and no refuelling of equipment shall take place on any area of river or lake bed.

(7) Any excess material from the construction operation, shall be removed from the river or lake bed and disposed of in an appropriate manner.

(8) All reasonable steps shall be taken to minimise the release of sediment to water during construction.