4.2.1 Purpose

The planning assumptions state the assumptions about:

1. Population and employment growth.
2. The type, scale, location and timing of future development including the demand for each trunk infrastructure network.

The planning assumptions together with the desired standards of service form a basis for the planning of the trunk infrastructure networks and the determination of the priority infrastructure area. The planning assumptions have been prepared for:

1. The base date 2011 and the following projection years to accord with future Australian Bureau of Statistics census years: 
   1. mid 2016
   2. mid 2021
   3. mid 2026
   4. mid 2031.

The time horizon for Planning assumptions (as outlined in the Priority Infrastructure Area (PIA) (refer 4.1.3)) may be different to the time horizons used in the determination of trunk infrastructure requirements. As outlined in the Sustainable Planning Act, the PIA will define the area "that will accommodate at least 10 years, but not more than 15 years, of growth …" In contrast, planning for trunk infrastructure may be undertaken over a longer period. 

1. The LGIP development types in column 2 that include the uses in column 3 of Table 4.2.1.1.
2. The projection areas identified in SC3.3 Local government infrastructure plan maps.

Table 4.2.1.1—Relationship between LGIP development categories, LGIP development types and uses

Details of the methodology used to prepare the Planning assumptions are stated in Table 4.2.8.1 Extrinsic material.