12/1/2015. Stream Restoration as a BMP for TMDL Compliance SCASM 4th Quarter Meeting. Overview of SCR Permit Section

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1 2014 HDR Architecture, 2014 HDR, Inc., all rights reserved. Stream Restoration as a BMP for TMDL Compliance SCASM 4th Quarter Meeting 2014 HDR, Inc., all rights reserved Overview of SCR Permit Section Making a Stream a BMP Inside the Chesapeake Bay TMDL Case Study Hopewell, VA 1

2 Beyond TMDL Monitoring & Assessment Plan SCRO30000 Permit Section 3 o Monitoring & Assessment Plans o Section Process for Assessment Selection of BMPs o Section 3.3 Data Assessment BMP Prioritization Schedule TMDL Implementation Schedule (Existing MS4) Activity Existing TMDLs New TMDLs Monitoring/AssessmentPlan January 1, 2015 Within 12 months of TMDL Monitoring Plan Initiated July 1, 2015 Within 24 months of TMDL Monitoring Duration 2 years 2 years TMDL ImplementationPlan January 1, 2018 Within 48 months of TMDL Monitoring of TIP, Revisions Ongoing through Permit Cycle Ongoing through Permit Cycle TMDL Implementation Schedule (New MS4) Activity Existing TMDLs New TMDLs Monitoring/AssessmentPlan January 1, 2016 Within 24 months of TMDL Monitoring Plan Initiated July 1, 2016 Within 24 months of TMDL Monitoring Duration 2 years 2 years TMDL ImplementationPlan January 1, 2019 Within 60 months of TMDL Monitoring of TIP, Revisions Ongoing through Permit Cycle Ongoing through Permit Cycle 2

3 BMPs for Consideration Non-Structural BMPs o Public Education o Ordinances/Rules/Regulations Better Site Design o Pollution Prevention o Street Sweeping Structural BMPs o Stormwater Treatment Wetlands Wet Ponds o Runoff Reduction Bioretention Permeable Pavement What about Stream Restoration as a BMP? What can it do for your watershed o Stream bank erosion o Floodplain connection o Riparian buffers o Water quality/aquaticlift What other benefits can it have o Stabilize or improve property value o Protect other infrastructure o Community connections (i.e. greenways) Pollutants of Concern with Stream Restoration Sediment Nitrogen Phosphorus Bacteria 3

4 Experiences from Chesapeake Bay Bay TMDL Action Plans Three tier process to get to full compliance by 2025 o First Permit Cycle 5% o Second Permit Cycle 35% o Third Permit Cycle 60% Pollutants of Concern (reductions from impervious) o Sediment 20% o Nitrogen 9% o Phosphorus 16% Cost-effectiveness of Stream Restoration Cost-effectiveness of Stream Restoration 4

5 Expert Panel Research and Policy Development Publications Stream Restoration Stormwater BMP Retrofits Stream Restoration Guidance Default Values for Planning (Virginia DEQ Guidance Memo) Detailed Values for Design (Expert Panel) Detailed Analysis Panel of Experts Protocol Protocol 1 o Credit for Prevented Sediment during Storm Flow Protocol 2 o Credit for In-Stream and Riparian Nutrient Processing within the Hyporheic Zone during Base Flow Protocol 3 o Credit for Floodplain Reconnection Volume 5

6 Case Study Hopewell, VA Marina BMP Project Hopewell Marina BMP Project Targeted BMPs Stream Bank Stabilization Regenerative Stormwater Conveyance Wetland Enhancement/Expansion Stream Restoration 6

7 Hopewell Marina BMP Project Targeted BMPs Stream Bank Stabilization Regenerative Stormwater Conveyance Wetland Enhancement/Expansion Stream Restoration Hopewell Marina BMP Project Targeted BMPs Stream Bank Stabilization Regenerative Stormwater Conveyance Wetland Enhancement/Expansion Stream Restoration Hopewell Marina BMP Project Targeted BMPs Stream Bank Stabilization Regenerative Stormwater Conveyance Wetland Enhancement/Expansion Stream Restoration 7

8 Protocol 1 Prevented Sediment Data Needs o BEHI and NBS Scoring of existing stream o Bank Height o Soil Bulk Density Calculations o Determine Erosion Rate o Calculate Sediment Loss Apply Efficiency Rate (50%) Apply Soil Delivery Ratio (0.061 for Coastal) o Apply ratio for N and P Protocol 2 In-Stream and Riparian Nutrient Processing Data Needs o Design Bankfull Section o Soil Bulk Density o De-nitrification Rate Calculation o Hyporheic Area o Total Mass of N Loss (Tn/day) o Covert to Pounds per year o Credit only for Nitrogen Protocol 3 Similar Curves for N and P Floodplain Reconnection Volume Data Needs o Storm Event that activates floodplain Concert to Rainfall Depth o Amount of Storage/Treatment by Floodplain o Rain Data for examining range of events Calculation o Rainfall depth to access floodplain o Floodplain Storage Volume (Watershed Inches) 8

9 Summary of Results Protocol 1 Subject to VDEQ Final Review Summary of Results Protocol 1 Subject to VDEQ Final Review Summary of Results Protocol 2 Subject to VDEQ Final Review 9

10 Summary of Results Protocol 2 Subject to VDEQ Final Review Summary of Results all BMPs Subject to VDEQ Final Review Summary Is Stream Restoration an Effective BMP? Yes May not be for all situations and pollutants of concern Best Practices are available to quantify its benefit o Chesapeake Bay TMDL o Gwinnet County, GA 10

11 Stream Restoration as a BMP for TMDL Compliance Thank you! Contact Information: Ron Geiger Ron.Geiger@hdrinc.com 11

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