Stormwater Management - Example
- Comply with the State Environmental Protection Policies (SEPPs) which require that all water runoff has minimal environmental impact on the receiving waterways, incorporating all aspects of Water Sensitive Urban Design Principles.
- Retain and enhance natural floodways.
- Preserve and enhance environmentally sensitive areas by retention of a maximum number of existing trees and other significant flora.
- Provide appropriate water quality treatment prior to stormwater discharge into the waterways.
- Provide large areas of water quality treatment for the external catchment.
- Provide such additional water quality treatment and retardation of flows developed from the existing catchments external to the site to produce a decrease in peak flows and increase water quality for waters discharging downstream of the development.
- To enhance the existing natural channels and provide wetlands as appropriate.
- To retard the peak inflow by use of detention basins and off-stream storage areas.
- To test, model and monitor the actual stormwater quality, as compared to SEPP objectives.
- Hydraulic modeling and waterway contouring for project development and earthworks.
These principles have been developed by PGA, and have been put into practice at Herriott’s Glen, Heritage and Sandhurst Club developments to mention a few. At Heritage in addition to stormwater management, all stormwater and sewerage effluent is treated on site by the use of ponds and flora, and reused for watering landscaped areas. The ponds also add to aesthetics and form part of the passive recreational areas.