Catchments in Nelson

A catchment is the area of land where rain and runoff drain into a particular stream, river, wetland, estuary, or coastal area. Everything that happens within a catchment from hill country and farmland to streets, parks, and backyards influences the health of downstream waterways.

Looking after freshwater means managing whole catchments, not just individual streams. Combining efforts across urban and rural areas helps improve water quality, protect native species, reduce flooding and erosion, and support healthy rivers from the mountains to the sea (ki uta ki tai).

Nelson’s freshwater catchments are generally small and steep, flowing from forested hills through urban neighbourhoods, rural land, and lowland areas before reaching estuaries and the coast.

Key catchments include:

Maitai/Mahitahi – a defining river system flowing from the Bryant Range to the Nelson Haven
Brook – a major tributary with important ecological values
York – hill‑country streams interacting with urban areas
Wakapuaka – a coastal catchment with high biodiversity values
Smaller coastal catchments draining directly to the sea

Most catchments include both urban and rural land uses, meaning restoration efforts must be coordinated across different landscapes and communities.

Urban and Rural Catchments – Different Places, One System

Catchments often include a mix of land uses. Actions taken upstream influence conditions downstream, and changes in one part of a catchment are felt elsewhere.

To reflect this, catchments in Nelson are considered in two broad ways:

Urban catchments, where waterways flow through built environments
Rural catchments, where land use includes farming, forestry, and open land

Explore our Nelson Catchments

Catchment Restoration in Action

Across Nelson, catchment‑based projects bring together urban and rural communities to improve freshwater health, including:

Project Maitai/Mahitahi – community‑led restoration from headwaters to estuary
Wakapuaka Bursting into Life – integrated catchment restoration supporting biodiversity and freshwater
Riparian restoration projects – planting and bank stabilisation across multiple catchments
Hill country erosion projects – reducing sediment entering streams
Sustainable Land Project - Looking after this Land

These initiatives show how coordinated effort across a catchment can deliver lasting improvements.

Catchments in Nelson - Urban and Rural