Modern Urbanized Stream Water Quality Improvement Technologies
Creating a Net Zero Water Quality Impact Solution in the Natural Environment
Navigating Agencies and Regulations
210-3-12Modern Urbanized Stream Water
Quality Improvements Technologies
• SWFWMD ERP
• Corps of Engineers
• Pinellas County
• NPDES
• Florida Game and Fish
• US Wildlife
• EPA
• 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
Map Out the Road to Achieving Net Zero Impact
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies3
DESIGN CONSIDERATIONS•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
•• The ultimate vegetative condition of the streambank and riparian areas influences local bank •dimensions. If these areas are managed in grass cover, they may produce a different bankfull width •than if they are fully forested.
•• Urban stream repair is still somewhat of an ongoing experiment, and every project should have •some form of monitoring or inspection to determine what worked, what didn’t, and why.
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies4
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
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies5
Curlew Creek Rehabilitation ProjectPinellas County, FL
• 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:
• 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
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies6
KEY PROJECT REQUIREMENTS
Beginning of Project
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies7
Project Tour: Channel D
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies8
Project Tour: Utilities
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies9
Project Tour: Kick Points
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies10
Project Tour: Channel A
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies11
Project Tour: Channel A
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies12
Project Tour: Existing Crossings
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies13
Project Tour: Pristene System
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies14
Project Tour: Kick Point
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies15
Project Tour: Channel A Roughness Factors
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies16
Project Tour: End Project
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies17
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies18
Flooding and Erosion Issues
Urbanized Systems Require Unique Solutions
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies19
Reference: Technical Supplement 14R, “Design and Use if Sheet Pile Walls in Stream Restoration and Stabilization Projects”, Part 654 National Engineering Handbook
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
Typical Channel Sections
• Buried Gabion Matt Design Features under a Natural Habitat Rehabilation System
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies20
Typical Plan View with Cross Vane
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies21
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”
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies22
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
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies23
Questions?
10-3-12Modern Urbanized Stream Water
Quality Improvements Technologies24
Top Related