Note: this guideline is issued by the Surveyor-General under section 7(1)(ga) of the Cadastral Survey Act 2002 about the Rules for Cadastral Survey 2010 and is not legally binding.

The following information relates to rule 3.4 and the accuracy requirements for determining the position of a water boundary or an irregular boundary on a cadastral survey.

The accuracy of a water boundary or an irregular boundary must be determined to take into account:

  • the risk of overlap or ambiguity in boundaries, including the water boundary on the other side of the water body [r 3.4(a)(i)],
  • any statutory requirement applying to the width or size of the related water bodies [r 3.4(a)(ii)].  An example is the 3 m threshold that applies to marginal strips.  If a stream is close to the 3 m threshold and Pt 4A Conservation Act is applicable, the accuracy will need to be sufficient to clearly establish whether the stream is over or under 3 m,
  • the potential for the margin of the water body to move in the future and for the related water boundary to either move to a new position or to become permanent in the original surveyed position [r 3.4(a)(iii)].  An example is in the case of avulsion or a dried up stream where the original definition of the water boundary becomes primary evidence for the location of a boundary that is no longer movable,
  • the nature of the physical feature that defines the boundary [r 3.4(a)(iv)].  An example is the bank of a stream, and
  • the value of the land and the intensity of the land use [r 3.4(a)(v)].

Accuracy of the intersection of right-line boundary and water boundary

At the point where a right-line boundary and a water boundary intersect:

  • the right-line boundary vectors must meet the boundary accuracy standards [r 3.3 and 9.6.13(c)], and
  • in the case of a new boundary point, the accuracy of boundary witnessing specified in rule 3.6 must be met.
Diagram showing accuracy requirements where right-line boundary and water boundary intersect
Figure 1: Accuracy requirements where right-line boundary and water boundary intersect

Accuracy of the intersection of right-line boundary and irregular boundary

At the point where a right-line boundary and an irregular boundary intersect: 

  • the right-line boundary vectors must meet the boundary accuracy standards of rule 3.3, and 
  • in the case of a new boundary point, the accuracy of boundary witnessing specified in rule 3.6 must be met.
Diagram showing requirements where right-line boundary and irregular boundary intersect
Figure 2: Requirements where right-line boundary and irregular boundary intersect

Accuracy of adopted water and irregular boundaries

In the case of adopted water boundaries or adopted irregular boundaries that are to be used to define a new parcel:

  • an adopted boundary must be assessed to ensure it meets the accuracy criteria of rule 3.4 (see above), 
  • an accepted boundary is not required to comply with the accuracy requirements of rule 3.4.  Examples where this occur include:
    • a boundary for a parcel that will remain in a limited title or an interim title [r 6.3(a)(v)],
    • an irregular boundary of a type specified in rule  6.3(a)(vi),
    • a boundary of a type specified in rule 6.3(b) for a balance parcel or residue parcel,
    • a boundary of a parcel over 100 ha [r 6.3(c)].

Class of survey required for water and irregular boundaries

All water and irregular boundaries must be assigned a class of survey [r 3.2] and be reported [r 8.2(a)(xii)].

Last Updated: 29 March 2017
Authority: Surveyor-General - Section 7(1)(ga) of the Cadastral Survey Act 2002
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