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Stormwater harvesting – standards, regulations and Industry practice

Stormwater harvesting – standards, regulations and Industry practice. Presentation to Recycle Water 2013 30 May 2013. Overview. Current status of stormwater harvesting in VIC Typical SWH project’s components & function Melbourne Water Guidelines for SWH diversion Overview

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Stormwater harvesting – standards, regulations and Industry practice

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  1. Stormwater harvesting – standards, regulations and Industry practice Presentation to Recycle Water 2013 30 May 2013 http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  2. Overview • Current status of stormwater harvesting in VIC • Typical SWH project’s components & function • Melbourne Water Guidelines for SWH diversion • Overview • Functional requirements • Base flow & maintenance flow requirements • Design examples • Joint initiatives of Melbourne Water and IPWEA • IVS – independent verification of stormwater treatment devices • Stormwater Harvesting Guidelines • Questions http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  3. Definitions • Urban stormwater - “net increase in run off and decrease in groundwater recharge resulting from the introduction of impervious surfaces such as roofs and roads within urban development” • “Urban stormwater” is only available within the urban growth boundary • Base flow in waterways is not considered urban stormwater - no access to base flow will be permitted http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  4. Interim allocation rules • If stormwater is flowing to the sea via a drain, 100% of the stormwater may be harvested • If stormwater is flowing to a stream from an existing development up to 50% of existing stormwater can be harvested for use and 50% is reserved for the environment • If there is a scheme to harvest more than 50% of the resource a study is required to assess implications for the environment • All stormwater generated from new development is available for harvesting http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  5. Licensing The harvesting of water from Melbourne Water’s drains and waterways requires a licence under Section 51 of the Water Act 1989 http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  6. Administration • Stormwater harvesting schemes continue to be managed through voluntary application of national and state guidelines • Relevant guidelines: Australian guidelines for water recycling: managing health and environmental risks (phase 2) - stormwater harvesting and reuse (NRMMC, EPHC et al. 2009) • No compliance monitoring requirements (voluntary compliance) http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  7. Stormwater Harvesting Scheme Major Components http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  8. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  9. Need to set some definitions… http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  10. Guidelines for Stormwater Harvesting on Melbourne Water assetsDesign, Construction & maintenance of diversion structures http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  11. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  12. To assist stormwater harvesting proponents Melbourne Water has developed standard drawings and associated technical guidelines for the design, construction and maintenance of diversion structures for stormwater harvesting on Melbourne Water assets. The availability of these drawings and guidelines is expected to deliver the following benefits: • To assist proponents and applicants in developing a suitable design likely to be supported by Melbourne Water • To ensure that Melbourne Water’s operational and environmental requirements are met and the outcome is therefore consistent with stormwaterharvesting principles. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  13. Functional requirements • reliable diversion of designed flow rates and volumes and uniform diversion rate control • min hydraulic impact on the existing drainage system • automatic operation and reliable performance (e.g. no moving parts) • minimal risk of blockage • minimum maintenance requirements • safe access for inspection, maintenance and cleaning • allowance for flow calibration and metering • structural integrity • prescribed flow is being passed through (environmental and/or self-cleansing flows) • ability to be isolated or shut off in case of maintenance requirement or pollution incident. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  14. Base flows and self-cleansing velocities For all new diversion structures constructed on Melbourne Water drainage assets, allowance should be made to pass low/base flows through the system both prior to and during times of flow diversion in order to avoid sediment deposition and associated maintenance problems in the drainage network. The minimum self-cleansing velocities for the design of these flows must be calculated on a case by case basis using the boundary shear stress approach. These calculations shall demonstrate that the design solution allows for the continuation of base flows through the system and that these flows produce the boundary bottom shear stress equal to or exceeding the pre-set minimal boundary bottom shear stress of τ ≥ 1.5 Pa. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  15. Design Examples http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  16. Design Examples http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  17. (A) Independent verification scheme for stormwater treatment devices(B) Development of Storm Water Harvesting Guidelines – VIC Current Industry Initiatives http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  18. Overview • Joint initiatives of Melbourne Water and IPWEA • Participation and support from Environmental Protection Authority Victoria (EPA Vic), Victorian Department of Health (DOH VIC), Victorian Civil Contractors federation, Storm Water Victoria, CSIRO, MonashUni and other industry representative http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  19. Independent verification scheme for stormwater treatment devices http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  20. ProjectObjectives The overall aim of this project is to establish the regulatory and administrative framework, product testing and validation protocols and performance database for the storm water treatment devices to enable the better utilization and broader uptake of Integrated Water Cycle Management (IWCM) in Victoria http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  21. Concept REGULATIONS ADMINISTRATION a TECHNICAL http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  22. Jurisdiction and extent • The proposed IVS is developed and implemented in the state of Victoria, Australia serving as a pilot for the broader National scheme. Devices covered by the scheme • This Independent Verification scheme applies to pre-engineered, commercially-available technologies for storm water treatment. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  23. Development of Storm Water Harvesting Guidelines – VIC http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  24. ProjectObjectives • The objective of this project is to produce comprehensive guidelines for the practical implementation of storm water harvesting schemes in VIC as part of an Integrated Water Cycle Management (IWCM) approach. • The resultant document has the potential to be included as an appendix to the new revision of Urban storm water best practice environmental management guidelines (BPEMG), adding consolidated knowledge from across Australia to the practical implementation of SWH schemes. http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  25. Concept http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  26. Conclusions • Stormwater harvesting schemes continue to be managed through voluntary application of national and state guidelines with no regulatory compliance monitoring requirements • Definitions and interpretations vary greatly across the industry • No verification and/or validation requirements for performance • Number of industry initiatives both at the state and National level • Future directions http://iourivwatersolutions.com.au/ BH: 03 9502 4229

  27. Questions http://iourivwatersolutions.com.au/ BH: 03 9502 4229

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