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“Boots on the Ground” Are Already Going Green: Stream Restoration Best Management Practices from Maintenance Programs
Northeastern Transportation & Wildlife Conference Wednesday, September 14, 2016
James W. Buck, CPESC Maintenance Environmental Coordinator
Region 9 - Operations
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New York State has experienced several major floods during
the late 1900’s to the early 2000’s due to intense rainfalls.
Examples include:
October 1955: Schoharie Creek – 16 to 18 inches of rainfall
September 1975 – Susquehanna River/Catskills – Hurricane Eloise
March 1980 – Schoharie, Catskill & Esopus Creeks – 10 inches of rain. “Great
Catskill Toilet Flush”
April 4-5, 1987 – Mohawk River & Catskills, record flooding causing the sudden
collapse of NYS Thruway bridge over Schoharie Creek resulting in 10 deaths
January 19-20, 1996 – Rapid snowmelt and 2-4 inches of rain caused severe
flooding throughout Region 9. Record flooding on Schoharie Creek.
September 1999 – Tropical Storm Floyd – 3 to 12 inches of rainfall.
September 17-18, 2004 – Hurricane Ivan – up to 6 inches of rainfall.
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More examples….
June 2006 – Flood of Record for most of NYSDOT Region 9. Up to 12 inches of rain.
Several deaths occurred as a result.
April 2007 – Catskill Region – 6 to 8 inches of rainfall.
June 2007 – T/O Colchester, Delaware County, NY – flash flooding resulting in 4 deaths.
July 2008 – T/O Colchester, Delaware County, NY – flash flooding – same locations as
June 2007
August 28, 2011 – Tropical Storm Irene – Widespread flooding
September 5-8, 2011 – Tropical Storm Lee – Widespread flooding
October 2012 – Hurricane Sandy
June 2013 – Flash Flooding – Widespread throughout NYS.
Localized events - 2014, 2015 & 2016.
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Catskill Region Climate High rainfall compared to rest of state
Climate change causes increasing precipitation levels and variability (more extremes)
Streams are adjusting to increase flows
Difficult to predict local severity of forecasted rain event
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Comparison of 100 year storms
Data ending 1993 Data ending 2003
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Background Information
As a result of increased flooding and infrastructure
damage, State Maintenance Forces are often called
upon to respond to an emergency or to reduce the
potential for future damage.
In an emergency situation, there is much pressure to “do
something”
“Something” generally translates to “Equipment & Operator”
Employees should have a basic knowledge of stream
mechanics to be able to intervene in an emergency and then
restore the conditions.
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Stream Restoration defined…
Restoring stream to original dimensions, pattern and profile to allow it to contain
a bankfull discharge flow at which channel maintenance is most effective.
Bankfull flow: “The bankfull stage corresponds to the discharge at which the
channel maintenance is most effective, that is, the discharge at which moving
sediment, forming or removing bars, forming or changing bends and meanders,
and generally doing the work that results in the average morphologic
characteristics of the channel.” - Dunne and Leopold, 1978
Bankfull flows generally occur on the 1.5 year interval in NY’s Catskill Region.
Stream restoration also reconnects the stream and floodplain, which can
mitigate future flood damage.
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Stream work with Maintenance Personnel
Train Employees
Assemble a “Team”
Networking
Partnerships
Restore the stream
Identify the problem
Develop solutions
Develop schedules
Obtain permits
Undertake work
Re-vegetate site
Evaluate post-construction
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Training of Employees
All NYSDOT Region 9 Highway Maintenance Supervisors
(HMS 1 & 2) and Operators (HMW2) have attended “Post
Flood Emergency Stream Intervention Training as developed
by the Delaware County Soil and Water Conservation District.
Several operators and supervisors attended a Pilot Training
session of this class that included a field session.
Field experience for operators and supervisor is critical for
success.
It is equally important for employees to witness streams under all
flow conditions (low flows, bankfull flows, and flood stages).
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Training Topics Precipitation
Stream
Mechanics
Stream Types
Flood plains
Stream
Instability
Impaired
Floodplains
Unstable
Channels
Avulsion
Flood Response
Channel Sizing
Examples –
Field
Experience
Work Methods
De-Watering
Methods
Permitting
Types of
Equipment
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The “Team”
Other groups within Department may have expertise that can
be utilized.
Outside agencies / organizations may have the necessary
information to improve planning and design
Soil and Water Districts, Regulatory Agencies, etc
May need to “Shared Services” for equipment and materials.
Coordinated work:
Other local governments
Others who are working upstream/downstream.
NYSDOT work is limited to on Right-of-way, in most instances.
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Stream Restoration Process
Identify problem
Develop solutions
Develop schedules
Obtain permits
Undertake work
Re-vegetate site
Post construction evaluation
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Identify the Problem
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Develop Solutions
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Develop Schedules
Prioritize work locations
Availability of specialized equipment, if needed
Site limitations
Runoff season?
Severe weather forecasted?
Stream flow conditions
Regulatory limitations
Protect fisheries
Protect endangered species, if applicable.
Protect bats if tree cutting needed
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Obtain Permits State and/or federal permits may be required
Documentation is critical, even under emergency
conditions!
Length and width and dimension of fills
Before and after photos
If possible, coordinate with regulatory agencies before
undertaking work
Level of detail in permit documentation required may be
different depending on the regulatory agency.
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Undertake Work
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Re-vegetate Site
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Post-construction evaluation
09/20/2007 10/28/2007
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Post-construction evaluation
09/20/2007 10/28/2007
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Case Study: Cadosia Creek – Kerryville Brook NYSDOT Region 9 – Delaware County
NYS Route 268 Kerryville Brook
Both streams are tributaries to the Delaware River and
are trout spawning streams.
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NYS Route 268 over
Cadosia Creek bridge
NYS Route 268 over
Kerryville Brook culvert
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Identify Problem
Kerryville Brook
High sediment load in the Kerryville Brook
due to eroding banks and slides.
The majority of this sediment deposits at
the mouth of Kerryville Brook.
The culvert that carries Route 268 over the
Kerryville Brook would continually have a
reduced hydraulic capacity due to sediment
deposits and aggradation.
Cadosia Creek
Cadosia Creek’s bed elevation was almost
even with the adjacent floodplain.
Cadosia Creek would usually overflow and a
flood channel would form at the toe of the
Route 268 embankment
Erosion at the approach to the NYS Route 268
over Cadosia Creek bridge would cause water
to bypass inlet and erode Route 268.
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NYS Route 268 over
Cadosia Creek bridge
NYS Route 268 over
Kerryville Brook culvert
Area of roadway flooding
Areas of erosion
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Proposed Solutions
Kerryville Brook
Remove sediment from under
culvert structure.
Protect bank downstream
Install cross-vanes upstream and
downstream of bridge structure
Install straight vane at confluence
with Cadosia Creek
Vegetate with willow cuttings.
Cadosia Creek
Create flood plain bench
Utilize root wads for bank
protection, where applicable.
Install cross vanes
Install straight vanes
Place heavy stone rip rap as bank
protection, where needed.
Vegetate with willow cuttings.
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Kerryville Brook
2 Cross vanes were installed
upstream of the NYS Route 268
culvert structure.
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Kerryville Brook
Accumulated sediments were
removed from under
culvertstructure using a walk-
behind tracked loader.
1 Cross vane was installed
downstream of NYS Route 268
culvert structure.
Heavy stone protection was
added at the toe of slope.
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Cadosia Creek
Cross vanes were installed in
Cadosia Creek between the
confluence with Kerryville Brook
and the NYS Route 268 over
Cadosia Creek bridge structure.
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Cadosia Creek
Removed an average of 2.0 feet
of accumulated sediments from
active channel to establish a single
channel.
Established a flood plain bench
below abandoned O & W Railroad
Line.
Used root wads, where available,
as bank protection.
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Cadosia Creek
Installed 2 straight vanes within
channel immediately upstream of
NYS Route 268 over Cadosia
Creek bridge structure.
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Cadosia Creek
Installed 2 straight vanes within
channel immediately upstream of
NYS Route 268 over Cadosia
Creek bridge structure.
Installed stacked heavy stone as
bank protection upstream of inlet to
NYS Route 268 over Cadosia
Creek bridge structure.
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Cadosia Creek – Kerryville Brook Sites
Over 1500 Hybrid Willow (Salix spp.) were installed in the fall of 2011.
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Vegetation – 2 years later
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Case Study: Panther Rock Brook NYSDOT Region 9 – Sullivan County
Panther Rock Brook, a tributary of Callicoon Creek, has
a large, but low clearance culvert in the middle of a
hamlet (Youngsville, NY)
Hydraulic openings:
35.0 ft. span by 3.4 ft. high
Bridge has a concrete bottom slab.
Culvert has issues clogging with debris and sediments,
which causing localized flooding with extensive
damage.
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Panther Rock Creek: 2006 Flood
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Panther Rock Creek: 2006 Flood
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Identify Problem – Panther Rock Creek
“Floods of Record” occurred on June 26, 2006
and June 28, 2006.
Caused many trees to fall into the stream.
Widespread bank erosion.
In response to these floods, local officials hired
contractors to “Clean the streams”.
Resulted in widespread destabilization of the banks.
Increased sediment loading and aggradation of the stream
channel near the bridge.
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Proposed Solutions - Panther Rock Creek
1st: Recommend to town/locals to vegetate banks to prevent
further erosion and mobilization of sediments.
2nd: Remove sediments from under bridge with Micro Track
excavator
This was a non-sustainable approach.
3rd: Maintenance forces partnered with SWCD and installed
rock vanes upstream of culvert to better manage sediment
deposition and control flows through bridge structure.
Work partners included Sullivan County Soil and Water District
and the Youngsville Fire Department.
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Panther Rock Creek: 2009
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Panther Rock Creek: 2010
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Panther Rock Creek: 2010
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Panther Rock Creek – 2010
October 2010 – 1 month post construction
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Panther Rock Creek: Next Steps
Cross vanes facilitated the stream’s ability to carry sediments
through the structure for approximately 3 years without any
maintenance required.
This watershed had microburst (15 inches rainfall) on July 4, 2014.
Another “500 year flood” resulted.
Sediments needed to be removed from cross-vanes.
Next step: A bridge replacement project is scheduled for 2017 to
replace bridge with a larger structure to accommodate
debris/sediment transport.
Involves the purchasing of private property and building removal.
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Stream Restoration with Maintenance Forces: Opportunities
Materials simple and relatively inexpensive
Maintenance forces understand the problems
They’re closest to the problem when it rains!
Workers/supervisors like restoration work
Work is interesting and a change
They like leaving it “Better than before”.
Allows partnerships, yields multiple benefits: protects
assets and natural resources
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Stream Restoration with Maintenance Forces:
Challenges
Permits are generally required.
Required de-watering
Added costs
Site may not make it feasible
Equipment (gradalls, excavators) may be limited.
Need additional training:
Constructing rock structures
Maintenance may not have enough staff and equipment.
Other work may be of a higher priority.
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Stream Restoration with Maintenance Forces:
Issues
Some watersheds may have so many
upstream/downstream problems that simple, site
specific solutions may not possible.
Work may be larger in scope than can be completed by
Maintenance forces.
How to plan for future weather that is more extreme?
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Acknowledgements
John Rowen – NYSDOT Main Office
NYSDOT Maintenance Forces
Delaware-South Residency 9-4
Sullivan Residency 9-7
Delaware County Soil & Water Conservation District
NOAA – NWS Albany
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Thank You!