Many titles exist which include a notification вЂњExcepting land below a depth from the surface of 15.24 metresвЂќ or similar.

Total Area (5 parts) 700m 2Д®xcepting land below a depth from the surface. There will be no objection to the total area indicating the number of parts, e.g.The total area must be provided within or related to the most significant part of each lot,.Areas are to be shown only in the plan view,.Reference to a natural or structural feature may be shown on the plan provided the stratum boundary of the lot or affecting interest is defined by reference to AHD.ДЄreas must be provided for stratum lots to the same general requirements of a non-stratum lot as follows: reference to an adjoining lot) is not acceptable. All boundaries must be horizontal or inclined regular planes.Дefining stratum limits by abuttals (i.e. It is not acceptable to define a stratum boundary by a curve or curves. Where any substantial structure (including a fence) is within 1 metre of a boundary related to AHD the requirements of clause 63(1)(e) Surveying and Spatial Information Regulation 2017 apply.

The direction of view is shown in the plan views by arrows at the terminals of the section line see below The section line must be identified in the plan view. The designated line is referred to as the section line. In this diagram the upper limit of lot 1 is defined by 2 inclined planes which meet at the broken line.ДЄlthough not required a surveyor may choose to define the stratum boundaries by providing across section.ДЄ cross section is the representation of the stratum, through a vertical plane, of the lots visible when viewed along a designated line.

Lot 1 is limited in height by two inclined regular planes defined by the reduced levels shown on the plan and unlimited in depth.

In this example the upper limit of lot 1 is defined by an incline plan depicted by the reduced levels shown at the corners of the lot In some cases it maybe beneficial to use cross sections to clearly define the boundaries. It will be likely that each corner of a lot be defined by a reduced level.

Lot 1 is limited in height by an inclined regular plane defined by the reduced levels shown on the plan and unlimited in depth.

Where the stratum subdivision is complex it may be necessary to show several plan views at different levels. Reduced levels should relate to each corner of the stratum lot(s) as required. If the lot is limited by an inclined plane or planes more detail will be required.

The part of lot 2 designated (X) is limited in height to RL 30.75 and is otherwise unlimited in height and depth.

Lot 1 is limited in height to RL 27.1 and unlimited in depth.

If the limit of a lot is defined by a horizontal plane it may be described in a simple statement The heights should be described on the plan as Reduced Levels,e.g. Plans which create or redefine any stratum limitation must, in addition to complying with all o the usual plan requirements, contain sufficient information to adequately define the stratum of each lot or affecting interest and comply with clauses 13, 69 & 71 Surveying and Spatial Information Regulation 2017.Д¬lause 13 Surveying and Spatial Information Regulation 2017 requires that the levels in plans must be related to Australian Height Datum (AHD) or other datum approved by the Surveyor General.ДЄll heights shown must be verified by closed height difference between 2 or more bench marks that each have accurate AHD values (see below). The stratum boundaries may be horizontal planes defined at a fixed level or inclined planes defined by multiple levels. These lots are described as stratum lots and their upper and lower limits are defined by stratum boundaries. However, a plan may be prepared whereby an upper and/or lower height limitation is placed on a lot or affecting interest. In most cases it is understood that the land shown in a deposited plan is, theoretically, unlimited in both height and depth.

Strata definition