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From our friends at NCSU Stormwater Engineering Group a fact sheet on the benefits of and applications for creating an internal water storage (IWS)...

A List of Stormwater Outreach Resources compiled by the Chesapeake Stormwater Network.

Designing Bioretention with an Internal Water Storage (IWS) Layer; Urban Waterways Journal, NC State University, 2009

Bioretention Performance, Design, Construction and Maintenance; Urban Waterways journal, NC State University, 2006

A generalized watershed disturbance-invertebrate relation applicable in a range of environmental settings across the continental United States, Urban Ecosystem, July 2010

Mitigation of Impervious Surface Hydrology Using Bioretention in North Carolina and Maryland