Part 5 – Wastewater Drainage

5.10    Minimum Cover Points

5.10.1    General

All pipelines other than those in private property shall be specifically designed to support the likely loading in relation to the minimum cover to be provided.  The minimum cover for all types of pipes (other than those in private property) shall be 600 mm or as agreed by the Asset Manager - Strategy and Policy.

Note:  NZS 3725 provides useful guidelines. 

5.10.2    Private Property

The minimum cover over unreinforced Council pipes in private property shall be 500 mm.  Where, due to the topography, this cover cannot be provided, the pipeline shall be protected.  Specific design information will be required.

Where the reticulation lines are located in the front yard of lots, the invert level shall be deep enough so as not to interfere with any future development such as driveway construction.

5.10.3    Under Carriageways

Where pipes are designed below carriageway, they shall be specifically designed to support the pavement design loading appropriate to the minimum cover to be provided at both subgrade and finished level.

5.10.4    Private Pipes

The depth of cover of private pipes is dealt with under the Building Act 2004.