Stormwater Network

Stormwater is excess rainfall or water that doesn't soak into the ground. Stormwater includes rainwater off the roof and water that runs off hard surfaces, driveways and streets into the gutter.

Council needs to control stormwater to protect our community's health and safety and minimise property damage and access. Adequate collection and disposal arrangements are of critical importance and the flood prevention focus is important.

Council is involved in the following key functions with regards to stormwater:

Management of stormwater systems (mostly in urban residential areas), including public open drains.
Flood prevention, including maintaining urban watercourses.

Note: Council has a minor Flood Protection responsibility in that it puts floodgates in place in specific locations when levels in the Grey River reach a specific height.

Council's approach to managing stormwater is detailed in the Annual Plan and Long Term Plan.

Managing Stormwater and Private Drainage Responsibilities

Property owners are legally responsible for maintaining all private stormwater pipes, gutters, downpipes, drains and surface water ( overland flow) on their land up to the point where they connect to the Council’s main public network.

When heavy rain occurs, blockages or poorly maintained private drains can cause localized flooding, overland flow, and property damage. Understanding who owns which part of the network ensures issues are resolved quickly.

Building Consent Authorities (BCAs) are primarily responsible for ensuring that new building work and site modifications comply with the New Zealand Building Code and the Building Act 2004 regarding surface water disposal. Their role is strictly regulatory and preventative during the consenting process. They are not responsible for managing everyday maintenance or resolving pre-existing drainage disputes between neighbours.

Stormwater Network

Managing Stormwater and Private Drainage Responsibilities

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