As part of rolling out the Proposed Auckland Unitary Plan (notified September 2013), Auckland Council has made available online maps (www.aucklandcouncil.govt.nz) to identify areas prone to flooding within the Auckland Region.
On these maps you can see whether your property is affected by overland flowpaths or flooding. Many of these maps are based on a rapid flood hazard assessment approach and are generally conservative in nature.
Council may require you to undertake a flood assessment if you wish to develop your property and if your property is located within one of these flood hazard areas, or you may like to assess the risk of flooding to existing buildings on your property for your own peace of mind.
We have undertaken numerous flood assessments for private properties for these reasons over the last year or so. These assessments range from relatively simple projects (e.g. site inspection, runoff calculations and short letter report) to more sophisticated work (e.g. catchment management plan review, flood modelling), depending on the nature of the flood hazard.