11 9 2010 am. trails symposium mods for rec.boating
DESCRIPTION
This was a presentation I made regarding how low head dams, utility crossings and other river obstructions can be modified to provide recreational boating access. I presented this at the 2010 American Trails Symposium.TRANSCRIPT
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WHPacific, Inc.
John Pflaum, P.E.
Water Resources Division
Say No To Portaging! Modifying Impediments to Recreational Boating
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“If there is magic on this planet, it is contained in water”
--Loren Eiseley
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Man’s Impact
Picture: Peter Atkins
Picture: Bob Searns Picture: Bob Searns
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Impediments to Recreational Boating Dams
Utility Crossings
Grade Control Structures
Diversion Structures
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Problem Illustration
Ogee and Sloping Dams are hazardous.
Shape creates a re-circulating current that can trap victims.
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Dam Modification – Stepped Face Design
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Dam Removal Considerations
Ecological Impacts
Economic Impacts
Societal Issues
Technical/Engineering Issues
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Basic Components
Chute (ramp with drop)
Pools and Eddy Features
Entry and Control Sills
Separation Berm or Wall
Multi-Function Bypass Boat and Fish Passage
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Maintain function of structure
Accommodate full range of flows and flood events
Satisfy Environmental and Recreation objectives
Protect public health, safety and welfare
Economics
Multi-Function Bypass Design Considerations
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Confluence Park, Denver, CO 1965 Flood Brought focus to
S. Platte River
PRDC Formed - River rehab enthusiasts
Confluence Park constructed 1975
“Seed Project” for S. Platte Greenway
Irrigation Diversion Dam Modification
First Urban on-stream whitewater venue in U.S.
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Confluence Park, Denver, CO
1976 1996
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Confluence Park, Denver, CO
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3rd Avenue Dam, Denver, CO
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3rd Avenue Dam, Denver, CO
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Union Ave Dam, Englewood, CO
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Florida Ave Dam, Denver, CO
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Utility Crossings/Drop Structures S. Platte River, Denver, CO
Sheet Pile Check Dam
19th St. Stream Gauging Station
Sanitary Sewer Crossing
Stabilization Drop Structure
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16th St Grade Control Structure, Denver, CO
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Ditch Diversion Structure, Littleton, CO
Neglected Warning Sign
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American River, Auburn California
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Restoration of Former Partially Constructed Auburn Dam
American River, Auburn California
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Low Pressure Coanda
Effect Pulls Water In
Leading Edge
Deflects Water In
American River, Auburn California
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Big Hole River – Divide, Montana
Ogee Shape = Keeper Wave
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Big Hole River – Divide, Montana
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Big Hole River – Divide, Montana
COMPLETED PROJECT
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Modeling Techniques Refinement of details for:
Public Safety
Boating Features
Fish Passage
Erosion Protection
Range of Flow Analyses
Structure Function
Physical Models
Numerical Models
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Whitewater Design
Flow-3d Used To Design Recreational Whitewater Bypass Channel (7 Ft Drop Over 600 Ft)
Results Documented for Fun Whitewater without Dangerous Hazards
0.2 FPS 25.7 13.0
DOWNSTREAM – 24 FPS -
UPSTREAM + 8 FPS
DOWNSTREAM - 8 FPS
Big Waves but Velocity Vectors
Directed Up and/or Downstream
Big Waves
Good Eddys
X VELOCITY
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DESIRED WHITEWATER WAVE Side Profile in 3d Computer Model
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Conclusions Modification of an existing river/stream structure
offers a feasible alternative to full dam removal.
Function of structure can be maintained
Provides
Public Health & Safety Benefits
Environmental Benefits
Recreation Benefits
Advanced 3-D modeling or physical modeling can identify and reduce safety concerns and confirm flow conditions and performance for multiple uses.
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Getting There STAKEHOLDERS
Irrigation Districts
Municipal Water Suppliers
Utility Companies
Riparian Landowners
Riverfront Development
Business/Economic Development
PARTNERS
Passionate Citizens/River Enthusiasts
Whitewater, canoe, boating clubs
Government Agencies
Non-Profit Organizations
Tourism/Chambers of Commerce
PERSISTENCE!
Foster passion for river improvement
Regular meetings
Host events and river trips
Focus on river safety and environmental benefits
Keep volunteers and local leaders interested
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Thanks!
The End