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

2. Navigating Agencies and Regulations 210-3-12 Modern 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

3. Map Out the Road to Achieving Net Zero Impact 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 3

4. 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. 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 4

5. 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 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 5

6. Curlew Creek Rehabilitation Project Pinellas 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 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 6 KEY PROJECT REQUIREMENTS

7. Beginning of Project 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 7

8. Project Tour: Channel D 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 8

9. Project Tour: Utilities 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 9

10. Project Tour: Kick Points 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 10

11. Project Tour: Channel A 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 11

12. Project Tour: Channel A 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 12

13. Project Tour: Existing Crossings 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 13

14. Project Tour: Pristene System 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 14

15. Project Tour: Kick Point 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 15

16. Project Tour: Channel A Roughness Factors 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 16

17. Project Tour: End Project 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 17

18. 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 18 Flooding and Erosion Issues

19. Urbanized Systems Require Unique Solutions 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 19 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

20. Typical Channel Sections Buried Gabion Matt Design Features under a Natural Habitat Rehabilation System 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 20

21. Typical Plan View with Cross Vane 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 21

22. 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” 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 22

23. 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 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 23

24. Questions? 10-3-12 Modern Urbanized Stream Water Quality Improvements Technologies 24