2012 riparian restoration in contaminated …environments conference presented by: joel gerhart....
TRANSCRIPT
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2012 Riparian Restoration in Contaminated
Environments Conference
Presented By: Joel Gerhart. P.E.
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DEQ
NRDP
EPA
Greenway Services District
Pioneer Technical Services
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Brief Overview of the Streamside
Subarea 4 Project
Summarize Key Design Criteria
Lessons Learned in Construction
Lessons Learned in 2010 and 2011 Floods
Design Changes
Summary
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Anaconda
Project Area
Butte
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Approximately 9 Miles of Stream
Approximately 1.8M CY Tailings
Approximately 1300 Acres of Floodplain
Long Channelized Reaches
Few Owners – Mostly DEQ
Numerous Existing Grade and Flood
Controls
Ice Jams and Overflow Channels
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Side Channels
Channelized
Section
Tailings On
Floodplain and In
Overflow Channels
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Highway Bridges
Active Railroad
Elevated Bench
Historic Floodplain Limit
Silver Bow
Creek
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Alluvium Berms to
Contain the Channel
Channel With Limited
Planform, Uniform
Grade
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Ice Jam In
Main Channel Flows
Diverted to
Side Channel
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Diverted Flows
Eroding Tailings
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Coordinate Remedy/Restoration Actions Bankfull Flow – 210 CFS Floodplain Access/Flood-Prone Area Native Channel Substrate Sediment Transport Issues Infrastructure Protection/Constraints Variable Plan Form and Channel Width Minimal Existing Channel Crossings Flexible Floodplain Design Favorable Site Setting - Geology
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Channelized
Section
Project Start Diversion
Structures
Active RR Variable
Planform
Channel
Diversion
Highway
Bridges
Transmission
Lines
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SA3
SA4
Quaternary
Alluvium
Project Area
Anaconda
Butte
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Compaction of Fill In Channel Corridor
Floodplain Grading and Fill Haul
Point Bars/Bend Radii
Tighter QA/QC
Fabric Issues - Substitution • Reseeding
• Ice Damage
Channel Shelf
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Additional
Removal
Haul Road
Limited
Stockpile
Areas on East Excess Fill
On West
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Point
Bar/Channel
Width Issues
Stockpile
Seeding
Problems
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Ice Shelf
Cracking and Torn Fabric
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Fabric tears
Ice Hooks
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Summarize Flows
Damage Areas and Repairs
Aerial Photos
Ground Photos
Changes to Bankfull Flow Statistics
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Cutoff
Channel
Cutoff
Channel
Flood-Prone/
Scour Areas
Extra Removal
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Cutoff
Channel
Main
Channel
Unseeded
Terrace
Terraces
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Cutoff
Channel
Side Channel
Flood-Prone/
Scour Areas
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End of
Reconstructed
Channel
Cutoff
Channels
Flood-Prone
Area
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Flood-Prone/
Scour Areas
Stream
Channel
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BNSF RR
Point Bar
Willows and
Bank
Vegetation
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Years of Record 23
Normal Range of Bankfull Days/Year 7-14
Bankfull Days Before 2010 115
Bankfull Days/Year Before 2010 5.5
Bankfull Days in 2010 24
Bankfull Days in 2011 47
Bankfull Days After 2011 186
Bankfull Days/Year After 2010 6.3
Bankfull Days/Year After 2011 8.1
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Larger Channel
Coir Fabric/Coir Rolls
Shallower Bank Slopes
Minimum Channel Dimensions
Floodplain Swales or Side Channels
Compaction in Fill Areas
QA/QC
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450
300
210
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450
300
210
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450
300
210
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Shelf/Sideslope
Coir Log
20 CFS Low Flow Line
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210 CFS At Top of
Coir Log
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~300 CFS At Top 6:1
Grade Break
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~450 CFS At Top of
Fabric
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~500 CFS At Floodplain
Connection
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Shelf/Sideslope Native Rocky
Substrate
Wider Upper
Width Protected
By Fabric
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Larger Channel Capacity
Floodplain Still At Risk
Limited Initial Stability
Side Channels/Terraces
Ice Jams Remain A Wildcard
QA/QC Is Key
Expect and Budget for Some
O&M/Repair
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