Stream Restoration through Stormwater Runoff Management and Retrofit: New Objectives, New Approaches

Larson, Marit; Walsh, Christopher J.; Fletcher, Tim D.; Bos, Darren; Rossrakesh, Sharyn

doi:doi:10.1061/41009(333)82

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Stream Restoration through Stormwater Runoff Management and Retrofit: New Objectives, New Approaches

ASCE Conf. Proc. doi:http://dx.doi.org/10.1061/41009(333)82

Low Impact Development for Urban Ecosystem and Habitat Protection

Proceedings of the 2008 International Low Impact Development Conference

Marit Larson¹, Christopher J. Walsh², Tim D. Fletcher³, Darren Bos⁴, and Sharyn Rossrakesh⁵

¹City of New York Department of Parks and Recreation, Natural Resources Group, 1234 Fifth Ave, New York, NY 10029; marit.larson@parks.nyc.gov
²Principal Research Fellow, Department of Resource Management and Geography, Melbourne University, 221 Bouverie Street, Parkville Victoria 3010, Australia; cwalsh@unimelb.edu.au
³Director, Institute for Sustainable Water Resources, Department of Civil Engineering, Monash University, Victoria 3800, Australia; tim.fletcher@eng.monash.edu.au
⁴Melbourne Water, PO Box 4342 Melbourne VIC 3001, Australia; sharyn.rossrakesh@melbournewater.com.au
⁵Project Coordinator, Department of Resource Management and Geography, 221 Bouverie Street, Parkville Victoria 3010, Australia; cwalsh@unimelb.edu.au

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Abstract

The Little Stringybark Creek restoration project is the first of its kind, focusing on reducing stormwater runoff using LID strategies across an entire sub-watershed. Urban streams around the globe demonstrate common characteristics associated with the increased imperviousness of their watersheds, including a flashy hydrograph, elevated concentrations of pollutants, altered channel morphology, and increased dominance of pollution tolerant species. Urban streams cannot be restored to pre-disturbance stream health conditions without addressing the combined water quality and hydrologic disturbance (increased volume and frequency of polluted stormwater runoff) from impervious areas delivered by drainage infrastructure in developed watersheds. This poses a great challenge for stream restoration, since it is much easier to implement local or reach scale in-stream or riparian projects than to reduce the stormwater impacts of impervious areas in a catchment. One of the key needs for the protection or restoration of streams in urban or urbanizing catchments is, therefore, a better understanding of specific and practical stormwater management objectives at the catchment and site scale aimed at addressing hydrologic characteristics that affect streams.