Montgomery County Capital Improvement Project to Stabilize the Breewood Tributary November 14 2012 Sligo Middle School Introductions Doug Marshall Watershed Planner Montgomery County Department of Environmental Protection MCDEP ID: 725227
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Breewood Stream Restoration
Montgomery County Capital Improvement Project toStabilize the Breewood Tributary
November 14, 2012
Sligo Middle SchoolSlide2
Introductions
Doug MarshallWatershed Planner, Montgomery County Department of Environmental Protection (MCDEP)
Jean Kapusnick
Watershed Restoration Engineer, MCDEP
Mike Thompson
Project Consultant, Biohabitats
Doug Streaker
Project Engineer, Biohabitats
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Project Background
Project GoalsExisting Conditions
Proposed Conditions
Example Projects
Restoration Monitoring
Schedule
Questions
Outline
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Breewood Tributary (DA=57 ac, impervious cover=45%)
County’s National Pollutant Discharge Elimination System (NPDES) monitoring watershedConcentrated watershed effort
Large sediment input to Sligo Creek
Exposed infrastructure
Project Background
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Project Background - Location
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Land use changes in a watershed and along a stream corridor system , such as an increase in paved area, can results in impacts to stream structure and function.
Project Background - Need
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Ecological restoration
process of assisting the recovery
of an ecosystem that has been
degraded, damaged, or destroyed
Stream restoration
threat to infrastructure
unable to ecologically recover from a degradation
Habitat improvement
Create diverse biological communities
Project Goals
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Improve water quality
Improve aquatic and terrestrial habitat
Reduce stream channel bank and bed erosion
Eliminate hazards to those who recreate near the stream
Protect infrastructure and utilities
Reconnect stream to floodplain
Enhance riparian forest
Increase habitat diversity
Improve ground water recharge
Stormdrain outfall improvement
Goals of Stream Restoration
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Existing Conditions
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Habitat enhancement
riffle/pool complex
riparian cover – shading and avian habitat
diverse and native plant communities, floodplain forested wetlands
Stabilization channel bed and banks
raising channel invert and minimize bank erosion
protect Infrastructure
Reduce maintenance to outfalls and channel
Increase Floodplain function
reconnecting to floodplain
Public engagement, education, and participation
Proposed Conditions - Approach
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Proposed Conditions
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Proposed Conditions
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Elevated stream bed – floodplain connection
Safe conveyance of large storm eventsDiverse habitat
Reduced sediment losses to Sligo Creek
No more canyon
Proposed Conditions
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Example Projects
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Restoration During Construction
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Restoration After Construction
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Restoration After Construction
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Stream Stability
Bank Erosion
Aquatic insects
Fish
Vegetation
Restoration MonitoringSlide19
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Site Survey
Natural Resources Inventory and Forest Stand Delineation – under review
Forest Conservation Plan – under development
60% design – draft, seeking input
Schedule -
Work Completed To Date
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Public Meeting – November 14, 2012
60% Design and apply for permitting – December 2012
Final Design – April 2014
Construction – October 2014
Schedule
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Questions?November 14, 2012Slide22
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Non-Biting Midge
Diving Beetle
Damselfly Larvae
Backswimmers
Water Scorpion
Dragonfly Nymph
Phantom Midge
Water Strider
Swallows, Adult Dragonflies, Frogs
Background-Mosquito Predators
November 14, 2012