Dorney - Dam Removal and NC DWQ
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Transcript of Dorney - Dam Removal and NC DWQ
8/6/2019 Dorney - Dam Removal and NC DWQ
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For
Dam
Removal
Workshop
Hosted
by
American
Rivers
June 14, 2011
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DWQ and Dam Removal in NC
DWQ has long been strong supporter of dam removal
2004 Guidance
2008 guidance
Required Dillsboro dam removal for FERC relicensing
for Duke Energy hydros
Agreed with potential stream mitigation credits for
Carbonton
and
Lowell
Mill
dam
removals
pending
meeting performance standards at closeout
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Water Quality Benefits of Dam Removal
Restore rare, threatened and endangered species
Cape Fear shiner with Carbonton dam
Appalachian elktoe with Dillsboro dam
Restore appropriate aquatic community
From poor to good‐fair/fair for aquatic insects with
Dillsboro dam
Improve water quality
Especially dissolved oxygen, chlorophyll a from lakes
Anadromous fish passage
American shad with Lowell mill dam
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Carbonton dam
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Water Quality Concerns with Dam Removal
Downstream sedimentation and turbidity water quality standard
Document extent of fine sediment and dredge where needed
Dillsboro dam dredged appx. 60,000 cubic yards
Wetland draining
Document potential threat
Develop plan to address including monitoring
Headcutting of tributaries
Largely unavoidable
Address thru stabilization where needed
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Dillsboro dam tributaries
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Permitting
404 Permits often required
If 404 required, then 401 Certification required
Contact Corps of Engineers early and discuss
permitting in all dam removal projects
Pre‐application coordination crucial with Corps, DWQ and resource agencies such as WRC and US
Fish and Wildlife Service