Water Management

3 - Water Management

Site Planning

Water Management

All of Parramatta's catchments drain to the Parramatta River, a highly significant tidal estuary in Sydney. To protect this resource, impacts on receiving water quality from further development of the catchments needs to be minimised. Stormwater drainage networks and the floodway capacity of waterways need to be managed whilst preserving/enhancing the ecological integrity of the waterway systems.



Water Quality

Objectives
  1. O.1To ensure that downstream flora and fauna are protected from stormwater impacts during construction and post construction phases.
Design Principles
  1. P.1Water sensitive urban design principles are to be designed and integrated into the development rather than relying on 'end of pipe' devices prior to discharge. Details are to be provided with the Site Stormwater Managements Plan.
  2. P.2Operating practices and technology are to be employed to prevent contamination of stormwater.
  3. P.3Runoff entering directly to waterways or bushland is to be treated to reduce erosion and sedimentation, nutrient and seed dispersal.
  4. P.4The expected average annual post-development pollutant loads in stormwater discharge from development classified as 'high pollution risk' are not to exceed the following:
    Pollution Retention Criteria
    Pollutant Retention Criteria for Development Sites Description
    Gross Polutants Trash litter and vegetation larger than 5mm 70% of average annual load
    Fine Sediment Contaiment particles between 1.1mm and 0.5mm 80% of average annual load
    Coarse Sediment Contaiment particles 0.1mm or less 50% of average annual load
    Nutrients Total phosphorous and total nitrogen 45% of average annual load for each nutrient
    Hydrocarbons, motor oils, oils & grease   Whichever is greater
    1. 90% of average annual load; or

    2. Total discharge from site of Total Petroleum Hydrocarbons (TPH) < 10mg/L at all times
  5. P.5For development that is not classified as 'high risk', appropriate water management controls and management measures are to be included to protect and enhance water quality with the aim of reducing annual pollutant loads.

Note: A Site Stormwater Management Plan addressing the above design principles and objectives may be required.

Further Information