stream restoration: program and permitting considerations€¦ · 16/7/2013 · ms4 - phase 1...
TRANSCRIPT
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Stream Restoration: Program and Permitting Considerations
Matt Meyers, Chief Watershed Project Implementation Branch Department of Public Works and Environmental Services
Stormwater Management
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Fairfax County, Virginia
Chesapeake Bay Watershed
Size: 395 sq. miles Population: 1.1 million MS4 - Phase 1 Community
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Stream Restoration Management Considerations
• Watershed-based Approach • MS4 vs. Stream • Local vs. Chesapeake Bay Benefits • Design Techniques • Cost Effectiveness • Monitoring and Maintenance
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Stormwater FY13 Budget Emergency and
Flood Response, $0.9M, 2%
Operations, $14.7M, 38%
Conveyance Systems, $5.5M,
14%
Streams and Water Quality,
$8M, 20%
Dam Safety and Facility
Rehabilitation, $5.1M, 13%
Stormwater Regulatory
Programs, $5M, 13%
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Local TMDLs
• 72 Impaired Waters (2010) – 52 Streams – 3 Reservoirs – 17 Tidal Embayments
• 10 TMDLs to Date
– 6 Bacteria – 3 Sediment – 1 PCB
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Stream Restoration Permitting
USACE Norfolk District & Virginia DEQ • NWP 27 - Aquatic Habitat Restoration,
Establishment, and Enhancement Activities • NWP 3 – Maintenance • NWP 13 – Bank Stabilization
– 500 feet along the bank – 1 cubic yard per running foot
http://www.nao.usace.army.mil/Missions/Regulatory.aspx
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Considerations
• MS4 Outfall improvement – Approximately 7,000 outfalls – Regenerative stormwater conveyance system – Approve standard alternatives
• Headwater vs. Higher Order Streams – Focus on 1, 2, and 3 order streams – Drainage area less than 1 square mile – Challenges with higher order streams
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Considerations
• Design Challenges – Restoration techniques – Priority 1 to 4 – Channel sizing
• Design Support – MBRT vs NWP Reviewer – Pier review process – Regional data
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http://va.water.usgs.gov/projects/ffx_co_monitoring.htm
USGS Studies • Sediment sources and transport • Sediment and nutrient loadings • Management strategies • Restoration potential and
effectiveness
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Pohick Creek Tributary
Protocol 1: Preventing Sediment Protocol 2: Hyporheic Zone
Protocol 3: Floodplain reconnection Protocol 4: Dry channel RSC
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Pohick Creek Tributary
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Pohick Creek Tributary
Before: Exposed sanitary sewer line and highly eroded channel.
After: Before trees and shrubs were planted
Sanitary Sewer Approximate location of Sanitary Sewer
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Pohick Creek Tributary
First Spring – June 2013
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Dead Run Project Overview: Approximately 1,400 liner feet of Dead
Run stream that runs through McLean Central Park was stabilized with various practices including encapsulated soil lifts, toe protection, stone vanes, compost berms, and fiber log rolls. The stormwater outfall from Dolley Madison library was restored to include a sand filter step-pool system and wetland feature. The entire site was re-vegetated with extensive native plantings of trees, shrubs, grasses and wildflowers. This restoration will substantially mitigate bank erosion and improve water quality.
Protocol 1: Preventing Sediment Protocol 2: Hyporheic Zone
Protocol 3: Floodplain reconnection Protocol 4: Dry channel RSC
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Dead Run
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Stream Restoration Poplar Springs - Before & After
Drainage Area (acres)
Phosphorous Removal (lbs/yr)
Nitrogen Removal (lbs/yr)
Sediment Removal (tons/yr)
230.4 7.5 141 1.25
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Stream Restoration Poplar Springs - Now
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Stream Restoration Government Center - Before & After
Drainage Area (acres)
Phosphorous Removal (lbs/yr)
Nitrogen Removal (lbs/yr)
Sediment Removal (tons/yr)
150 10.7 202 1.6
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Matt Meyers Stormwater Management Department of Public Works and Environmental Services 703-324-5500 [email protected] www.fairfaxcounty.gov/dpwes/stormwater