LIUDD FACT SHEET

Manaaki Whenua Landcare Research 2 October 2005

Testing Stormwater Treatment Devices

The Goal: Improved design. Establish the performance of stormwater treatment Guidelines and engineering codes based on new devices. design and performance data. Contribute to Territorial and Local Authority driven The Tasks will provide: programmes to defi ne performance characteristics of Widely available biophysical and hydrological data. stormwater treatment devices Understanding of performance, maintenance, acceptance and costs (see Objectives 1 and 4).

The Technologies - What, Where, When? Projects Progress Device Location Discussion Planning Resource Construction Performance consent & Maintenance

Green Roof New Waitakere Building Rain Tanks Talbot Park North Shore Tiritiri Rd Tamaki Sustainable Building Rain Gardens Tamaki Sustainable Building Paul Matthews Rd Nth Shore Permeable Pavers Te Atatu Peninsula Riparian Strips Treatment Chamber River Rd, Wairere Dve Hamilton (Filters) SH1 Cmabridge Henderson Hewlitts Rd Retention Ponds Onemana, Waitakere City

LOW-IMPACT URBAN DESIGN AND DEVELOPMENT TTestingesting SStormwatertormwater TTreamentreament DDevicesevices

Timeline of Research

Green Roof+

Rain Tanks*

Rain Gardens+

Treatment Chamber/Filter++

Retention Ponds+++

Modelling and Integration+++

2001 2002 2003 2004 2005 2006 2007 2008 2009

Researcher: +Robyn Simcock; ++ Surya Pandey; +++ Sam Trowsdale; * Alison Greenaway in collaboration with Earl Shaver, ARC and CRC Catchment Hydrology, Melbourne; Waitakere City Council; North Shore City Council, Nga–ti Whatua, Environment , Environment , City Council; ; Land Transport .

LOW-IMPACT URBAN DESIGN AND DEVELOPMENT TTestingesting SStormwatertormwater TTreamentreament DDevicesevices

Learnings to Date: Permeable Pavers: Performance data and selection Green Roofs: Good overseas data on performance, support of media and cost effectiveness but limited data on suitable media and plants for NZ Riparian Strips: conditions. Experience with NZ prototype designs and Treatment Chambers/Filters: Defi ne best appropriate plants and growth media provided basis combination of materials with and without sand plus for NZ design. maintenance and L.C.A (with Objective 4). Rain Tanks: Much confusion regarding health issues Retention Ponds: Establish through monitoring design and social acceptance (Objective 1) to be resolved. features and the components of the ponds that Rain Gardens: Experience with retrofi tting, design and best contribute to contaminant removal and cost- construction and introducing re-engineered soil. (e.g. effectiveness (with Objective 4). Tamaki Building) and monitoring data. New design information for TP10. Modelling performance of individual Grass Swales: ARC data and our data emphasise soil devices quality, design and planting for stormwater fl ow and Effectiveness of systems in terms of water quality and water retention. water quantity; the treatment train approach - how Treatment Chamber/Filters: ARC and our data best to utilise together; synthesising overseas data defi ning optimum media and maintenance regime and NZ data; economic, social and LCA aspects of for treatment walls in chambers. Organic material adopting these systems (with Objective 1 and 4). (e.g. compost, peat, wood ash, spaghum) will remove heavy metals and PAH’s. Other Actions: Retention Ponds: Removal of heavy metals, Ensure that learnings are targeted for maximum particularly zinc, suspended sediments and nutrients value, e.g. cost and effectiveness information provide better understood. for asset management plans.

Future Learnings: Who are we working with? Green Roof: Performance (quality and quantity) of FRST; Regional Council; Auckland City optimised NZ prototypes. Council; Waitakere City Council; North Shore City Council, Ngâti Whatua, Environment Waikato, Rain Tanks: Clarifi cation of health and technical Environment Bay of Plenty, Christchurch City Council; issues, addressing community concerns (Objective 1). Taupo District Council; Land Transport New Zealand; Rain Gardens: Performance data on NZ designs Co-operative Research Centre (Aus); Engineers; around Auckland and Tauranga. Planners; Practitioners; Developers. Grass Swales: Performance when soils are properly re-engineered.

LOW-IMPACT URBAN DESIGN AND DEVELOPMENT