Donaldson Run Tributary B Stream Restoration Project Update - - PowerPoint PPT Presentation

Donaldson Run Tributary B Stream Restoration Project Update

Donaldson Run Stakeholder Advisory Group Meeting June 2, 2011

Review of changes from 30% to 60% design

Reducing width of channel/floodplain to

reduce footprint and tree/valley impacts

Limiting re-location of pathway and

narrowing pathway

Reducing disturbance and tree impacts

below the footbridge

Updates from 60% design to 75% in February 2011

Step pool ‘grade control’ and ‘riffle’

structures

Initial analysis of hillside and storm pipe

drainage inputs

Initial water main survey Preliminary planting plan Invasive plant management framework

Updates from 75% design to 90% design

• Hydraulic analyses
• Vertical elevation of water main (pending)
• Hillside and storm pipe drainage inputs

l Meetings with specific property owners l Easement research l Preliminary design

• Advancement of planting plan and invasive plant

management strategy

• Consideration of construction access, equipment

type, future maintenance access

Hillside drainage inputs

Working with specific

property owners

Accommodating flow

inputs in project design

Storm pipe drainage inputs

Verifying

easements/pipe conditions

Incorporating needed

repairs/modifications into project design

Storm pipe drainage inputs – next steps

Complete easement research – meet with

specific property owners

At least one new easement may be needed TV inspection of all three pipes Finalize designs that control stream energy

and minimize future maintenance

30” Water Main

Interim work completed to protect exposed pipe Completed horizontal location survey in January May - Small borings excavated to confirm pipe

elevations

Data analysis pending Few apparent conflicts with stream restoration

design except at stilling basin – TBD

Considering reinforced streambed crossings for

future access to main if needed

Trees

No change in tree impacts from project

from 60% designs to current design

One tree removed to protect water main

(previously listed as a potential removal)

One tree has fallen (previously listed as a

removal)

Project impact: 36 trees>10” diameter, 72

trees overall

Invasive Management & Planting Plan

Goals:

To restore forest structure and

function

To support recreational use and

aesthetics

Kudzu

Invasive Plants

85-95% invasive species in the shrub and ground layers invasive species present on both park and private properties 27 different species

Implications

Invasive management considerable

component of the project

Project requires integrated planting and

invasive plant removal

4-6 year planting and invasive plant

maintenance schedule

Complete removal of invasive species is

likely not possible

Most successful if private citizens are

involved in invasive management

Invasive Management Actions to Date

Invasive plant removal workday, April 2 Invasive Plant Workshop – Upshur St, May 1

– Hosted by Amy White

Invasive Plant Workshop – Stuart St, May 17

– Hosted by Sarah & Jeffrey Knight

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

Invasive Management Actions - Next Steps

In the future, a spring and fall event will be

held on both Tributary A and Tributary B

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

Possibly one more invasive plant workshop

to engage homeowners is under consideration for fall 2011

Invasive Management – Looking Ahead

During construction/planting

l

“Clean” equipment

l

Mulch or mats for trees/shrubs

l

Seed heavily

l

Protect deer candy

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

Planting Plan

Site specific All plants will be native to Zachary Taylor

Park

Planting “zones” to account for habitat

changes with elevation and distance from the stream.

Special plantings for sensitive areas Multi-year to account for invasive control

and natural forest succession

Zoned Planting - Example

Slope Floodplain

Special Areas – Bare Slopes

Scarlet oak Quercus coccinea Arrowwood Viburnum dentatum Bluestem goldenrod Solidago caesia

Construction methods, equipment, & materials

Smaller materials and equipment

Smaller materials and equipment

Tree protection mats

Step pools and Step run feature

Next Steps

Continue work with property owners on

hillside drainage inputs and design work for storm pipe drainage inputs

Finalize planting plan and invasive plant

management plan

Develop construction access/staging plan Complete specifications including tree

protection plan

Target design completion by end of year Construction schedule still TBD

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….