Streambank erosion susceptibility

Streambank erosion susceptibility

Ministry for Cities, Environment, Regions and Transport | MCERT

This map shows how vulnerable each stream and river segment in New Zealand is to streambank erosion -- where the banks are most likely to crumble, slump, or wash away.

Every waterway segment is classified from very low through to very high susceptibility. If streams on your whenua show high susceptibility, the banks are at risk of eroding, which sends sediment into the water, widens the channel, and can eat into your productive land over time. Fencing waterways and planting riparian margins are the most effective ways to protect vulnerable banks.

The data is modelled using the River Environment Classification (RECv2.5) and calculates susceptibility based on a set of rules that take into account geology, slope, and catchment characteristics - but not whether erosion is actively happening right now.

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