By managing stormwater, we’re protecting water quality on our beaches and in lagoons. We’re working with the community to ensure that only rain goes down the drain.
Stormwater is the rain water that runs off hard surfaces such as roads, footpaths and car parks into our drains, creeks, estuaries, coastal lagoons and finally to the ocean. Stormwater pipes and other infrastructure are designed to efficiently carry stormwater to avoid flooding.
We maintain over 15,000 stormwater pits, 315km of stormwater pipes, 120km of drainage channels, and over 100 stormwater quality improvement devices to manage stormwater runoff and help improve water quality in our waterways.
Stormwater carries pollutants from:
chemicals from homes
earthworks from developments
herbicides, pesticides and fertilisers from gardens
leaves and lawn clippings
rubbish from roads
This results in poor water quality in our waterways which impacts on our aquatic plants and animals, as well as creeks, lagoons and beaches.
The increase in ‘hard surfaces’ in our catchments, along with the stormwater infrastructure which carries water rapidly to avoid flooding, also increases the risk of creek bank erosion during storms.
Water Sensitive Urban Design
Water Sensitive Urban Design (WSUD) aims to address many of these pollution and erosion issues, while harnessing the potential of alternative water sources in Warringah.
‘Catching’ unused rain water will increase resilience in times of drought. It will also reduce urban temperatures, reduce reliance on drinking water for activities such as watering gardens, and improve waterway health.
This is achieved through the installation of rainwater tanks; stormwater harvesting to re-use for irrigation; bioretention systems (rain gardens) to improve stormwater quality; infiltration systems to restore natural water movement; and landscaping practices, such as using porous paving and drought tolerant native species.
Another benefit of WSUD is it provides attractive and functional landscapes.
Warringah Council has been acknowledged as a founding partner of the Cooperative Research Centre (CRC) for Water Sensitive Cities, a world-first research program aiming to ‘increase the efficient use water resources available within towns and cities; enhance and protect the health of urban waterways and wetlands; mitigate against flood risk and damage and create public spaces that harvest, clean and recycle water, increase biodiversity and reduce urban heat island effects’. The CRC for Water Sensitive Cities brings together over 70 research, industry and government partners to undertake research into water management in Australia and overseas. See more on Water Sensitive Cities.
Stormwater Pre-Lodgement Meeting
A Stormwater Pre-Lodgement Meeting can advise you of specific stormwater information required for your DA and whether your drainage proposal is likely to be supported before your application is lodged with Council.