Water sensitive urban design (WSUD)

• Land above 5% AEP (1 in 20).
• Key infrastructure and activity areas (i.e. playgrounds/exercise equipment, picnic/kick and throw spaces, bins, pathways, fencing, access and car parking etc.) above 2% AEP (1 in 50).
• Buildings/structures (e.g. public amenities) above 1% AEP (1 in 100).
• Stormwater flows do not compromise function or safety in the park.

• Land above 5% AEP (1 in 20).
• Key infrastructure and activity areas (i.e. playgrounds/exercise equipment, picnic/kick and throw spaces, bins, pathways, fencing, access and car parking etc.) above 2% AEP (1 in 50).
• Buildings/structures above 1% AEP (1 in 100).
• Park layout designed so that stormwater flows do not compromise function or safety in the park.

• Land above 5% AEP (1 in 20).
• Key infrastructure and activity areas (i.e. playgrounds/exercise equipment, picnic/kick and throw spaces, bins, pathways, fencing, etc.) above 2% AEP (1 in 50).
• Structures above 1% AEP (1 in 100).
• Park layout designed so that stormwater flows do not compromise function or safety in the park.

• All land and infrastructure above 1% AEP (1 in 100).
• Park layout designed so stormwater flows do not compromise function or safety in the park.

• N/A

• Key infrastructure (i.e. exercise equipment, bins,pathways, fencing, etc.) above 5% AEP (1 in 20).
• Park layout designed so that stormwater flows do not compromise function or safety in the park.

• Playing fields above 5% AEP (1 in 20).
• Key infrastructure and activity areas (i.e. bins, pathways, fencing, access and car parking etc.) above 2% AEP (1 in 50).
• Buildings/structures above 1% AEP (1 in 100).
• Designed so that stormwater flows do not compromise function or safety in the park and fields allow sufficient drainage following a rain event.

• Playing fields above 5% AEP (1 in 20).
• Key infrastructure and activity areas (i.e. bins, pathways, fencing, access and car parking etc.) above 2% AEP (1 in 50).
• Buildings/structures above 1% AEP (1 in 100).
• Designed so that stormwater flows do not compromise function or safety in the park and fields allow sufficient drainage following a rain event.

• Key infrastructure and activity areas (i.e. bins,pathways, fencing, access and car parking etc.) above 2% AEP (1 in 50).
• Buildings/structures above 1% AEP (1 in 100).
• Designed so that stormwater flows do not compromise function or safety in the park and fields allow sufficient drainage following a rain event.

The ELS offers no specific advice on flood immunity for different types of reserve parcels, however it has the following information for waterways and wetlands:  

• Opportunities for vegetated buffers wider than minimum are investigated where: 
  • they would improve connectivity between priority biodiversity habitat areas, or 
  • the 1% AEP (1 in 100) flood hazard area extends further out from a waterway than the minimum buffers.

Co-location provides:

• Improved recreational outcomes, as it allows for separate recreation functions to exist whilst minimising user conflicts.
• Improved visual amenity, as it ensures that maximum open space opportunities remain for the recreational users. 
• Improved functionality:
  • improved stormwater quality and quantity outcomes on a separate parcel of land, that is specifically designed and designated for that utility. It allows for separate management and maintenance activities.
  • compliance with minimum Desired Standards of Service (DSS) presented in the ELS. This ensures the desired role and function of each open space category can be achieved (i.e. provision rate, size, shape, road frontage, flood immunity).

• Open space will still be required to manage stormwater runoff generated by that site.  
• New open space lots are NOT intended to be used to manage stormwater runoff generated from off site - this is the intent of the adjacent and complementary stormwater lot. Any existing stormwater functions should be identified during the planning and design phase and accounted for accordingly. 
• Stormwater quality infrastructure such as GPTs, streetscape raingardens, gully pits (including baskets), passive irrigation for street trees, etc., should be located to the greatest extent possible within road reserve or drainage easement, rather than in the open space.  

The site specific design would be dependent on:

• the site location and conditions
• the type and function of the WSUD (including maintenance requirements)
• different opportunities for social experience and observation that exist/opportunities for interactions with the device. 

The following positioning solution method is designed to illustrate how co-located land parcels could interact.    

See Figure 26: Example flood event map – Open space site with co-located WSUD solutions.

Integration provides:

• recreational value 
• visual amenity
• improved functionality
• nature - increased habitat value
• improved stormwater quality and quantity outcomes (including water harvesting)
• improved overland flow conveyance
• compliance with minimum Desired Standards of Service (DSS) presented in the ELS.  This ensures the desired role and function of each open space category can be achieved (i.e. provision rate, size, shape, road frontage, flood immunity).

• New stormwater infrastructure may only be considered acceptable, where there is an increased functionality of the open space. 
• It is preferred that stormwater quality infrastructure such as GPTs, streetscape raingardens, gully pit (including baskets), passive irrigation for street trees, etc., are located within road reserve, rather than in the open space. 
• In the instance where a portion of a recreation park or environmental reserve contains existing stormwater function, there are various ways in which new stormwater infrastructure can complement and improve the use of the site, without reducing the primary intended use or functional area. Introduction of new stormwater infrastructure must be considered on a site by site basis. 

The following positioning solution methods (case studies) are designed to maintain and or enhance the function of the site.