Donaldson Run Tributary B Stream Restoration Project Update€¦ · 02-06-2011 · Donaldson Run...
Transcript of Donaldson Run Tributary B Stream Restoration Project Update€¦ · 02-06-2011 · Donaldson Run...
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Donaldson Run Tributary B
Stream Restoration Project Update
Donaldson Run Stakeholder Advisory Group MeetingJune 2, 2011
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Review of changes from 30% to 60% design
ØReducing width of channel/floodplain to reduce footprint and tree/valley impacts
Ø Limiting re-location of pathway and narrowing pathway
ØReducing disturbance and tree impacts below the footbridge
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Updates from 60% design to 75% in February 2011
Ø Step pool ‘grade control’ and ‘riffle’ structures
Ø Initial analysis of hillside and storm pipe drainage inputs
Ø Initial water main surveyØ Preliminary planting plan Ø Invasive plant management framework
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Updates from 75% design to 90% design
Ø Hydraulic analysesØ Vertical elevation of water main (pending)Ø Hillside and storm pipe drainage inputs
l Meetings with specific property ownersl Easement researchl Preliminary design
Ø Advancement of planting plan and invasive plant management strategy
Ø Consideration of construction access, equipment type, future maintenance access
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Hillside drainage inputsØ Working with specific
property ownersØ Accommodating flow
inputs in project design
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Storm pipe drainage inputsØ Verifying
easements/pipe conditions
Ø Incorporating needed repairs/modifications into project design
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Storm pipe drainage inputs –next steps
ØComplete easement research – meet with specific property owners
Ø At least one new easement may be neededØ TV inspection of all three pipesØ Finalize designs that control stream energy
and minimize future maintenance
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30” Water Main
Ø Interim work completed to protect exposed pipeØ Completed horizontal location survey in JanuaryØ May - Small borings excavated to confirm pipe
elevationsØ Data analysis pendingØ Few apparent conflicts with stream restoration
design except at stilling basin – TBDØ Considering reinforced streambed crossings for
future access to main if needed
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Trees
ØNo change in tree impacts from project from 60% designs to current design
ØOne tree removed to protect water main (previously listed as a potential removal)
ØOne tree has fallen (previously listed as a removal)
Ø Project impact: 36 trees>10” diameter, 72 trees overall
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Invasive Management & Planting Plan
Goals:Ø To restore forest structure and
functionØ To support recreational use and
aesthetics
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Kudzu
Invasive PlantsØ 85-95% invasive species in the shrub and ground layersØ invasive species present on both park and private properties Ø 27 different species
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ImplicationsØ Invasive management considerable
component of the projectØ Project requires integrated planting and
invasive plant removalØ 4-6 year planting and invasive plant
maintenance scheduleØComplete removal of invasive species is
likely not possibleØMost successful if private citizens are
involved in invasive management
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Invasive Management Actions to Date
Ø Invasive plant removal workday, April 2 Ø Invasive Plant Workshop – Upshur St, May 1
– Hosted by Amy WhiteØ Invasive Plant Workshop – Stuart St, May 17
– Hosted by Sarah & Jeffrey KnightØ PRCR sprayed lesser celandine along both
Tributary B and Tributary A
Need help from the Civic Association to generate volunteer turn out and ideas on how to recruit additional volunteers
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Invasive Management Actions - Next Steps
Ø In the future, a spring and fall event will be held on both Tributary A and Tributary B
Ø Coordination with or expansion of the 2 existing RIP teams (Remove Invasive Plants) working in Zachary Taylor Park and coordination with Arlington Master Naturalists is being pursued
Ø Possibly one more invasive plant workshop to engage homeowners is under consideration for fall 2011
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Invasive Management –Looking Ahead
Ø During construction/plantingl “Clean” equipmentl Mulch or mats for trees/shrubsl Seed heavilyl Protect deer candy
Ø Post-Project/Maintenance• Protect trees and shrubs• Focus on stream banks• Target species• Coordinate invasive removal and planting• Timing of control will depend on plant life cycle• Flexible and adaptive
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Planting Plan
Ø Site specificØ All plants will be native to Zachary Taylor
ParkØ Planting “zones” to account for habitat
changes with elevation and distance from the stream.
Ø Special plantings for sensitive areasØMulti-year to account for invasive control
and natural forest succession
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Zoned Planting - Example
SlopeFloodplain
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Special Areas – Bare Slopes
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Scarlet oakQuercus coccinea
ArrowwoodViburnum dentatum
Bluestem goldenrodSolidago caesia
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Construction methods, equipment, & materials
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Smaller materials and equipment
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Smaller materials and equipment
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Tree protection mats
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Step pools and Step run feature
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Next StepsØ Continue work with property owners on
hillside drainage inputs and design work for storm pipe drainage inputs
Ø Finalize planting plan and invasive plant management plan
Ø Develop construction access/staging planØ Complete specifications including tree
protection planØ Target design completion by end of yearØ Construction schedule still TBD
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Learn more at: www.arlingtonva.us – search “Donaldson Run.”
Tributary A, June 2010
Stream restoration, watershed retrofits, Chesapeake Bay Preservation Ordinance, Stormwater Permit and more….