MS4 Municipal Stormwater Compliance: Pollutant Removal through Floodplain Restoration / Reconnection Villanova Urban Stormwater Partnership

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1 MS4 Municipal Stormwater Compliance: Pollutant Removal through Floodplain Restoration / Reconnection Villanova Urban Stormwater Partnership Pennsylvania Stormwater Symposium 2015

2 Today s Session Municipal Separate Storm Sewer System (MS4) Permits and the Six Minimum Control Measures Comprehensive Watershed Restoration Approaches Pollutant Reduction Plans / Total Maximum Daily Load (TDML) Reductions / WIPs Natural Stream Channel Design (NSCD) Step-pool Stormwater Conveyance Restoration and Bioengineering Techniques 2 Floodplain Restoration / Reconnection

3 Integrated Watershed Management/ Planning: Gray and Green Transportation / Land Use / Water Quality Green infrastructure (MS4/CSO/SSO) Highways and transportation Sustainability/walk-ability/ live-ability Capital infrastructure in concert with above Multiple Benefits: Increased Resiliency Multiple Benefits/Users (Triple Bottom Line: Social/Ecologic/Economic) Sustainable Cost Effective (B:C>1) 4 Floodplain Restoration / Reconnection

4 Gray to Green Streets Source: Green City Clean Waters, Philadelphia Water Department, 9/ Floodplain Restoration / Reconnection

5 Gray Infrastructure Land Development (Agricultural/Residential/Commercial/Ind ustrial/ Active Public Recreational Spaces) Transportation (Roads/Bridges/Transit/Airports/Ports) Utilities (Power/Sewer/Water/Gas/Electric/Comm unications) Stormwater and Flood Control (Basins/Impoundments/Dams/ Levees/Dikes) 6 Floodplain Restoration / Reconnection

6 Green Infrastructure Open Space Parks and Recreation Areas Passive Recreation (Trails/Walkways/Boardwalks/Footbridges) Pedestrian/ Bicycle Friendly Transportation Green Stormwater Infrastructure Best Management Practices (BMPs) / Stormwater Control Measures (SCMs) o o o o o Floodplain Reconnection NSCD Restoration/Stabilization Floodplain Wetlands Stormwater Wetlands Basin Retrofits/Naturalization 7 Floodplain Restoration / Reconnection

7 Opportunities: Key Stakeholder/Funding Partners USDA: Agriculture Related (e.g., stream tree plantings) EPA: Brownfields Redevelopment FHWA: Highways/Bridges/MAP 21 FTA: Transit/Rail Improvements O&G Development: Mitigation Banking Environmental Damage Settlements Natural Disaster Restoration Regional/County/Watershed Management Planning/Grants Stormwater Utility/Authority Community Public/Private Partnerships (CP3s) 8 Floodplain Restoration / Reconnection

8 Municipal Separate Storm Sewer System (MS4) Permits Six Minimum Control Measures (MCMs) 1. Public Education and Outreach 2. Public Participation/Involvement 3. Illicit Discharge Detection and Elimination (IDDE) 4. Construction Site Runoff Control (E&S Controls) 5. Post-Construction Stormwater Management (PCSM) 6. Pollution Prevention/Good Housekeeping Watershed: Pollution Reduction / Total Maximum Daily Load Requirements 9 Floodplain Restoration / Reconnection

9 NPDES Permits MCM #1 MCM #2 MCM #3 Regulated Small/Nontraditional MS4s design stormwater management plan that: Reduces discharge of pollutants to the maximum extent practicable (MEP) Protects water quality Satisfies appropriate water quality requirements of CWA 6 MCMs Additional TMDL/PRP Requirements MCM #4 MCM #5 MCM #6 Source: June 2011 Stormwater, 10 Floodplain Restoration / Reconnection

10 Planning Options Integrated Watershed/Infrastructure Planning: IWM Partnerships Private/Non Profit Groups Watershed Groups Municipalities, Agencies, MPOs/RPOs/DOTs More Comprehensive Water Quality Results Increased Investment Flexibility More Cost Effective Source: NYC s High Performance Infrastructure Guidelines 13 Floodplain Restoration / Reconnection

11 TMDL / Pollution Reduction Plan Sediment / Nutrients / Toxicants---- Impaired Waters (303d Listed) Integrated Watershed Management: Streetside GSI/Retention Berms Stream Restoration Floodplain Reconnection Stormwater Wetlands Riparian Buffer Enhancements Reforestation Basin Retrofits 14 Floodplain Restoration / Reconnection

12 Stream Restoration for Pollutant Reduction Natural channel design stream restoration as a means of improving water quality during bridge replacement and highway reconstruction Scour undermines bridges and may cause bridge failures due to structural instability. In the last 30 years, more than 1,000 bridges collapsed in the US and about 60% of the failures are related to the scour of bridge foundations. Reference: FHWA/LA.10/ Floodplain Restoration / Reconnection

13 Channel Processes: Stream Channel Succession Fluvial Geomorphic Design Process: Pattern Profile Dimension Sediment Transport (Aggradation/Degradation) Source: USEPA, Rosgen 1994, Floodplain Restoration / Reconnection

14 Natural Stream Channel Design Floodplain Reconnection Streambank stabilization In-stream habitat enhancements Bankfull bench grading Floodplain Wetland Development Swales/Drainage Ways and Intermittent Streams 19 Floodplain Restoration / Reconnection

15 Pollutant Reduction through Natural Stream Channel Design Restoration Stream restoration documented for future pollutant load reduction credit: 248 #/LF/YR Sediment Reduction Floodplain reconstruction documented for future pollutant load reduction credit 20 Floodplain Restoration / Reconnection

16 Step-Pool Stormwater Conveyance Source: My Green Montgomery, Montgomery County (MD) DEP 21 Floodplain Restoration / Reconnection

17 Examples of Integrated Gray Infrastructure Planning and Natural / Ecosystem Restoration I-76/DLA New Cumberland, York County 22 Floodplain Restoration / Reconnection

18 Floodplain Reconnection and Stormwater Wetlands Springfield Gardens Park Queens, New York City 23 Floodplain Restoration / Reconnection

19 Floodplain Restoration Stormwater Wetland Oakwood Beach, Staten Island Stormwater wetlands documented for future pollutant load reduction credit Stormwater wetlands: 80+ acres Riparian buffer enhancements documented for future pollutant load reduction credit NSCD Restoration LF 24 Floodplain Restoration / Reconnection

20 Floodplain Restoration / Reconnection Ecology Park, Valley Creek East Whiteland Township, Chester County BEFORE AFTER AFTER 25 Floodplain Restoration / Reconnection

21 Riparian Buffer Restoration Ecology Park - Valley Creek BEFORE AFTER 26 Floodplain Restoration / Reconnection

22 Floodplain Wetland / Stream Restoration SR 202 Mitigation Wetland Little Valley Creek, Tredyffrin Township 27 Floodplain Restoration / Reconnection

23 Stormwater Basin Retrofit Stream/Wetlands Reconstruction Tributary to Quittapahilla Creek LVC, Lebanon County 28 Floodplain Restoration / Reconnection

24 Stream Daylighting Floodplain Restoration Mill Run Headwaters Derry Township, Dauphin County 29 Floodplain Restoration / Reconnection

25 Lehman Township Park- Step-Pool Conveyance / Stabilization Winona Five Falls Monroe County 30 Floodplain Restoration / Reconnection

26 SR 441 Bridge Replacement and BMP Spring Creek Swatara Township. Dauphin County Park 31 Floodplain Restoration / Reconnection

27 Wildwood Lake Park and Regional Basin I-81 Dauphin County Parks 32 Floodplain Restoration / Reconnection

28 Bells Mill Run Reconnection - NSCD Wissahickon Creek Montgomery County 33 Floodplain Restoration / Reconnection

29 Cobbs Creek Park Market Street Philadelphia and Delaware County 34 Floodplain Restoration / Reconnection

30 Avenal Farm Golf Course Potomac Montgomery County 35 Floodplain Restoration / Reconnection

31 Center Street / Agricultural Wetland Conodoguinet Creek Cumberland County 36 Floodplain Restoration / Reconnection

32 Floodplain/Stormwater Wetland Center Street Cumberland County 37 Floodplain Restoration / Reconnection

33 Stormwater Wetland I-78 Berks County 38 Floodplain Restoration / Reconnection

34 Stream / Floodplain Restoration I-76/DLA New Cumberland, York County BEFORE AFTER 39 Floodplain Restoration / Reconnection

35 Stream Restoration- Floodplain Reconnection I-76/DLA New Cumberland, York County 40 Floodplain Restoration / Reconnection

36 Simple Low-No Cost Examples: Retentive Grading Storage/Infiltration 41 Floodplain Restoration / Reconnection

37 Disconnected Floodplain - Storage / Recharge 42 Floodplain Restoration / Reconnection

38 Disconnected Floodplain Storage 43 Floodplain Restoration / Reconnection

39 Offset / Retention Storage / Infiltration 44 Floodplain Restoration / Reconnection

40 International Examples of Integrated Planning and Floodplain Management Stormwater Park in Qunli, China Photo Source: Kongjian Yu River Waal, Netherlands Photo Source: Room for the River Waal Buffalo Bayou Promenade Photo Source: Tom Fox/SWA Reference: Gies, Erica. (2015, September 1). Cities are Finally Treating Water as a Resources, not a Nuisance Retrieved from: 45 Floodplain Restoration / Reconnection

41 Contact Info Thomas Graupensperger Project Manager / Senior Environmental Scientist Dewberry Engineers Inc. TGraupensperger@dewberry.com Floodplain Restoration / Reconnection

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