State highways can potentially affect natural waterways and drainage patterns. We have developed a stormwater treatment standard for our state highways, and other resources, to help meet our commitments in this area.
State highways can affect natural waterways and drainage patterns by:
We have developed a stormwater treatment standard for our state highways to help us meet our commitments to water resources. The standard assists roading practitioners with the selection and design of stormwater management practices, so that they:
We have published information and reports to assist roading practitioners with selecting and designing of roading stormwater management practices.
Find out more about stormwater treatment standards for state highway infrastructure
A value-for-money assessment was undertaken to compare the existing stormwater treatment requirements (phase one) with what would be required had our standard been in place (phase two) for six capital projects.
Read the value-for-money assessment
Read the detailed reports:
The Auckland Motorway Alliance has undertaken research on a number of stormwater management assets:
In 2011 we undertook a study to test whether the macroinvertebrate community index could be used to assess the long-term impacts of stormwater run-off from the state highway network on water quality in New Zealand streams.
Read the report: Assessing impacts of state highway stormwater runoff on stream invertebrate communities [PDF, 4.8 MB]
Read the State Highway Stormwater Sensitivity Project information sheet [PDF, 103 KB]
The following water resource themed research reports were funded through our research programme:
Email us at environment@nzta.govt.nz to register to receive email notification of environmental updates, or for more information.
