Collaboration and Planning for Successful Stream Management
Transcript of Collaboration and Planning for Successful Stream Management
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Collaboration and Planning for Successful Stream ManagementDenise Cameron, Woodard & CurranJohn Livsey, Town of Lexington, MA
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The Original Green Infrastructure:The Stream Channel
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A Typical New England Stream History
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Circa 1930
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1930 - Today
Route 2
1930
TODAY
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The Need
▀ Persistent flooding and complaints from public▀ Sediment buildup in streams and wetlands▀ Old and deteriorated drainage infrastructure▀ Desire to improve water quality and protect
wildlife habitats ▀ Consistently increasing stormwater
regulatory requirements
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Driving Action through Planning: Development of Stream Management Plans
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Conservation
Public Works
A Collaborative Approach
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A Plan for Action
Town of Lexington worked with Woodard & Curran to develop a plan for both watershed restoration anddrainage enhancement.
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A Phased Implementation
The plan was implementedin three phases,per major watershed:
▀ Charles River▀ Mystic River▀ Shawsheen River
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It starts with data…
A multi-year,comprehensivedrainage study,including both:
▀ Desktop Assessment▀ Field Surveys
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...it grows through public involvement…
▀ Began collaboration early▀ Formal and informal meetings:
Director of Conservation Watershed Stewards Capital Expenditure Committee TMMA (Town Meeting Members Association) Board of Selectmen
▀ Build support for program to getfunding at Town Meeting
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…it is refined through prioritization…
Conducted a pair-wise comparisonwith the following scoring criteria
Health & Safety Flood Mitigation Coordination with other
Town Projects Environmental Benefits Social Impact Improved O&M Regulatory Compliance
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…and it leads to a consensus for CIP
▀ From the three watershedstream management plans,a single, Capital ImprovementsPlan was developed
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A Balanced Funding Approach
Infrastructure Project Funding
Ecological Drainage Restoration Funding
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The Plan’s Foundation:Field Surveys
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Structures and Crossings
Stream Reaches
Stormwater Outfalls
What We Looked For In The Field…
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What we found in the field…
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What we found in the field…Culverts in
good shape…
…and culverts with structural and safety
issues
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What we found in the field…Trash and debris…
…hydraulic restrictions
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What we found in the field…Sediment buildup…
…and straightened channels
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What we found in the field…Stormwater Inputs…
…and drainagetrouble spots.
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The Plan’s Recommendations: Project Identification
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Categories of Recommendations
▀ Infrastructure & drainage restoration▀ Wetlands protection▀ Drainage investigation▀ Roadway and drainage system O&M▀ Long-term O&M for streams
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Fact Sheets
▀ One per recommendation▀ Summarizes existing
conditions andproposed project
▀ Detailed maps
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Putting the Plan into Action:Project Case Studies
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Willard’s Woods Stream Restoration
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Willard’s Woods Stream Restoration
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Willard’s Woods Stream Restoration
▀ Rather than replacing thefailed culvert, the Townopted to daylight the stream
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Willard’s Woods Stream Restoration
▀ A rock vane wasconstructed forenergy dissipationand grade control
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Willard’s Woods Stream Restoration
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Willard’s Woods Stream Restoration
▀ A headwall was constructed for the stream crossing under North Street
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Willard’s Woods Stream Restoration
▀ Pedestrian bridge was constructed at trail crossing
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Willard’s Woods Stream Restoration
▀ To save an existing tree, a stone wall was created using stones from the failed culvert
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Willard’s Woods Stream Restoration
▀ The stone was alsoused to reconstructthe stone wall alongNorth Street
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Willard’s Woods Stream Restoration:A Multi-disciplinary Approach
▀ Successful streamrestoration ismultidisciplinary Scientists Engineers Landscape Architects, Contractors experienced in
ecological restoration
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Willard’s Woods Stream Restoration:Creating a Natural Stream…not a Ditch
▀ Construction documents were developed to allow for flexibility during construction to better mimic the irregular conditions of a natural stream.
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Willard’s Woods Stream Restoration: Reference Reach Model
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Willard’s Woods Stream Restoration:Which one is the New Stream?
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Willard’s Crossing:
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▀ Sediment buildup at the trail culvert restricts culvert flow, contributing to upstream flooding
Willard’s Crossing: Culvert Removal
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Willard’s Crossing: Bridge Construction
▀ Vehicular Bridge to improve emergency access▀ Stone channel to manage flooding both upstream
and down
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Willard’s Crossing: Bridge Construction
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Vine Brook – Streambank Stabilization
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Vine Brook – Streambank Stabilization
▀ Bank failure led to sediment buildup in Vine Brook
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Vine Brook – Streambank Stabilization
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Vine Brook – Streambank Stabilization
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Vine Brook – Streambank Stabilization
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Whipple Hill Culvert
Replacement
Pleasant Street Drainage
Improvements
Valleyfield Drainage
Assessment
Upcoming Projects
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Conclusions: Keys to Success
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Keys to Success
▀ Engage community, municipal departments, and environmental groups to make it one all-encompassing project
▀ Don’t separate water quantity and quality▀ Make it an active plan – not just a study sitting
on shelf▀ Don’t lose momentum!
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Contacts
▀ Woodard & Curran Denise Cameron ([email protected]) Zach Henderson ([email protected])
▀ Town of Lexington John Livsey ([email protected]) David Pavlik ([email protected]) Karen Mullins ([email protected])
▀ Town of Lexington web site http://www.lexingtonma.gov/stormwater
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Questions &Discussion