Transcript Modern Urbanized Stream Water Quality Improvement Technologies Creating a Net Zero Water Quality Impact Solution in the Natural Environment.

Modern Urbanized Stream Water
Quality Improvement Technologies
Creating a Net Zero Water Quality Impact
Solution in the Natural Environment
Navigating Agencies and
Regulations
• SWFWMD ERP
• Corps of Engineers
• Pinellas County
• NPDES
• Florida Game and Fish
• US Wildlife
• Look for Common Goals
and agreements. Par
down Differences
• Identify and Resolve
Issues Immediately
• Keep Constantly in
Coordination with the
Regulating Agency
• Completing Agreed
Tasks on Schedule
• EPA
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Map Out the Road to
Achieving Net Zero Impact
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DESIGN CONSIDERATIONS
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Practices must be designed to effectively function over the entire range of urban
stream flows, from baseflow all the way up to the maximum expected flow.
Hydraulic modeling is often needed to estimate current and project future design
flows and flow velocities that structures must withstand.
The effect of each practice on channel hydraulics, sediment transport channel and
floodplain capacity, and fish passage should be thoroughly evaluated.
Engineers should seek to provide a stable active floodplain to dissipate streamflow
energy during high flows.
Deformable streambank treatments should always be considered in wider portions of
the stream
Bank toes are normally the most vulnerable area of both bank treatments
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Get Out of the Box
• Urbanized systems
require unique solutions
• Look to Combination of
Solutions of
Bioengineering and;
• Understanding that
Vegetation alone does
not always work and
must also include
evaluating engineered
features
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Curlew Creek Rehabilitation
Project
Pinellas County, FL
KEY PROJECT REQUIREMENTS
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Resident structures are at or near the existing top
of bank of Curlew Creek.
Taking of property was not an option
Curlew Creek is a flash flood prone system and
has flooded the residential area several times
Residents are concerned with continued erosion
of the creek bank and bank slope instability
Culverts and box culverts are undersized and
aged and will need replacement
Solutions to resolve flooding, erosion and
improvement of the natural habitat included
features such as:
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Expanded high flow creek sections
Establishing bankfull flow and determining the low flow HGL
The Curlew Creek is in a continual state of
dynamic erosion and within 8 years between
survey the creek bottom dropped an average of 1
foot
A system to stop the continued lowering of
Curlew Creek and enhancing the natural creek
components became a priority
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Beginning of Project
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Project Tour: Channel D
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Project Tour: Utilities
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Project Tour: Kick Points
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Project Tour: Channel A
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Project Tour: Channel A
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Project Tour: Existing Crossings
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Project Tour: Pristene System
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Project Tour: Kick Point
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Project Tour: Channel A
Roughness Factors
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Project Tour: End Project
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Flooding and Erosion Issues
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Urbanized Systems Require
Unique Solutions
Sheet pile walls provide solutions
where other stabilization applications
would fail. Applications considered
included:
• Toe wall scour protection
• Undermining protection
• Streambed grade stabilization
• Bank slope stability and Retaining walls
Reference: Technical Supplement 14R, “Design and Use if Sheet Pile Walls in Stream
Restoration and Stabilization Projects”, Part 654 National Engineering Handbook
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Typical Channel Sections
• Buried Gabion Matt Design Features
under a Natural Habitat Rehabilation
System
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Typical Plan View with Cross
Vane
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Supporting Natural Processes
with Engineered Features
“The final project maintains and allow the
natural geomorphological processes to
continue unimpeded in the natural flow
condition in the low flow creek channel
coupled with a buried protective backstop
provided by a engineered gabion mat and
rock vane system”
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A Net Zero Impact Solution
• Final Project Features results in a Solution
that Achieves the Common Goal
• Incorporates natural and bioengineered
systems
• Supported with advanced engineered
elements
• Results with a low flow ecological system and
provides for erosion and flood protection
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Questions?
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