1. Regenerative Stormwater Conveyence: An Integrated Approach to Sustainable Stormwater Planning on Linear Projects 2009 IOCET Adapting to Change Presented by: Joe Berg, PWS, CSE jberg@biohabitats.com

2. OVERVIEW Why change what we’re doing? What is Regenerative Stormwater Conveyence? How is this better than current practices? Opportunities for providing SWM and green infrastructure in linear systems—An Example

3. Transportation-related Land Cover ► Streets ► Parking ► Driveways Make up as much as 70% of the impervious cover footprint in most urban watersheds.

4. Impacts of Imperviousness

5. Changes in land and stream corridor use Changes in geomorphology and hydrology Changes in stream hydraulics Changes in function such as habitat, sediment transport and storages Changes in population composition and distribution, eutrophication and lower water table elevations Disturbance to a stream corridor system typically results in an increasingly negative spiral of degradation to stream structure and function. NEGATIVE FEEDBACK

8. Legacy Sediment Hydric Soil

12. SO WE TRY TO “FIX” THE PROBLEM

15. Regenerative Less Energy RequiredMore Energy Required Restorative Sustainable Green Conventional Practice Relative Improvement (LEED, GB Tool, Green Globe, etc.) Neutral – “100% less bad” (McDonough) Humans (Hominids) PARTICIPATING AS nature – Co-evolution of the Whole System Humans DOING THINGS TO nature – assisting the evolution of Sub-Systems “One step better than breaking the law” (Croxton) Technologies / Techniques Fragmented Living Systems Understanding Whole System Regenerating System Degenerating System Trajectory of Environmentally Responsible Design © All rights reserved. Integrative Design Collaborative and Regenesis 2006 - Contact Bill Reed, reed@integrativedesign.net for permission to use

16. Regenerative Stormwater Conveyance

17. Basic Building Blocks

18. Riffle weir grade control structure Sandstone boulders Silica cobble

19. Create Opportunities to ‘Hold’ Water on the Landscape

20. Main Channel The Seepage Feature

23. Less Intrusive, More Environmentally Sensitive

25. Benefits of the Regenerative Stormwater Conveyence Approach Water Quantity--Increased roughness, extend concentration time, increase water losses along the flow path, velocity and erosion reduction Water Quality —suspended sediment removal, trapping of particle-bound contaminants, nitrate reduction Reduced construction and O&M costs Aesthetic improvements, wetland hydrology support, amphibian and aquatic habitat support, terrestrial wildlife habitat enhancement, suppression of invasive plant species

26. Holladay Park Linear regenerative storm water conveyance alongside the road course Conversion of a storm water pond to seepage wetland In-line bioretention areas throughout the landscape

31. Challenges of Providing SWM in Transportation Settings Code Constraints—consistent with LID practices Offsite run-on—designed for safe conveyance Multiple watersheds and out of basin discharges--minimal Lack of space in ROW—requires less space than status quo Limited number of “acceptable” practices—uses nature Utility conflicts—reduced relative to status quo Other????

33. Questions? 2009 IOCET Adapting to Change Presented by: Joe Berg, PWS, CSE jberg@biohabitats.com