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 the use of an irregular boundary to define the horizontal extent of a parcel, and requirements where an existing irregular boundary is converted to right-lines under rule 6.6.

Where new irregular boundaries are permitted

New irregular boundaries are only permitted in the case of:

  • a landward boundary of an esplanade strip or movable marginal strip [r 6.6(c)], 
  • an existing water boundary where the margin of the water body has moved but the documentary boundary has not moved and the boundary meets the criteria for class C boundaries [r 6.7(a)(ii)], or
  • an existing water boundary that bounds a parcel of land that is to become part of an adjoining water body [r 6.7(c)].  Examples where this occur include parcels of erosion, and common marine and coastal areas.

Refer to erosion and residue parcels.

Refer to MACAA and land already part of common marine and coastal area as residue parcel.

Requirements where irregular boundaries are converted to right-lines

Boundaries that have been converted to right-lines must be defined by survey [r 6.2(a)(iii)] and in the case of a class A boundary, they must be marked on the ground [r 7.1(c)].

Adequacy of definition where irregular boundaries are converted to right-lines

The position of an existing irregular boundary is often defined by offsets from an adjoining water boundary.

In many cases the irregular boundary is depicted at a scale that is not sufficiently accurate for determining the location of the new fixed right-line boundary.

In these circumstances the boundary position may need to be determined from original field notes (if available) or by some other method, rather than copied directly from the existing CSD diagrams.

Examples of existing irregular boundaries

The majority of existing irregular boundaries in the cadastre are associated with older surveys where reserves or roads are offset from the edge of waterways or roads that divide large rural parcels.

Figure 1: Irregular boundaries

When existing irregular boundaries may remain

Existing irregular boundaries may remain where the boundary is able to be adopted as class C (refer to the conditions in rule 6.6(b)(ii)) or accepted as class D (refer to the conditions in rule 6.6(b)(i)). In all other cases, an existing irregular primary parcel boundary must be converted to right-lines [r 6.6(b)].

Note: irregular boundaries may remain for residue and balance parcels [r 6.3(b)].

Last Updated: 30 March 2017
Authority: Surveyor-General - Section 7(1)(ga) of the Cadastral Survey Act 2002
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