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Natural Channel Design Based Restoration & Enhancement

Natural Channel Design Based Restoration & Enhancement. Final BMP for Urban and Suburban Streams. Introduction. Overview of the Author Intent of the Presentation Briefly Introduce Natural Channel Design (NCD) Highlight NCD as an essential part of effective watershed management.

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Natural Channel Design Based Restoration & Enhancement

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  1. Natural Channel Design Based Restoration & Enhancement Final BMP for Urban and Suburban Streams

  2. Introduction Overview of the Author Intent of the Presentation Briefly Introduce Natural Channel Design (NCD) Highlight NCD as an essential part of effective watershed management

  3. Watershed Management Comprehensive Watershed Management Concept Holistic Involves Diverse Stakeholders and Diverse Interests Quality of Life, Public Access and Enjoyment of Natural Resources Needed in Order to Meet Increasing Financial Constraints Co-participation through Volunteerism, Capital Funding, and O&M Needed in Order to Meet Increasing Environ. Demands TMDLs, NPDES, Source Water Protection, Mitigated Dredging Review Example Initiatives NCD an Essential Part of Watershed Management

  4. Natural Channel Design Stream Restoration and Enhancement Design based upon the Science of Fluvial Geomorphology (study of river-related landforms) Analog Assigns dimensionless ratios to define plan and vertical forms for stability Empirical Utilizes empirical data to establish predictive formulas that define function Analytical Process based equations that define river function 4

  5. Natural Channel Design Streams Work to Achieve “Dynamic Equilibrium” in Response to Hydrological and Sediment Loading Characteristics Minimum Total Work Most Efficient Planform is a Sine-Generated Meander Pattern (minimal directional change) Most Efficient Vertical Form is a Cyclical Pattern of Riffles, Runs, Pools, and Glides that corresponds to the Meander Pattern Stable Cross-Section would include a Thalweg (low point), Baseflow Channel, and a Dominant Discharge Channel (Bank-full Channel) Discuss Current Example 5

  6. Sediment as an Asset and Liability A Dynamically Stable Channel will Move within the Bankfull Width without Degrading or Aggrading the Channel Section Sediment is Needed and is Naturally Conveyed in a Stable EcoSystem Needed for Aquatic habitat Excessive Sediment Load can Cause Harm Environmentally EPA Recognizes Sediment Loading as a Pollutant Discharge Sediment Loading Potentially Correlated to Bacteria Loading and Possibly Other Pollutants Increased Dredging/Material Handling Costs 6

  7. Best Management Practices NPDES Phase I and Phase II MS4 Permits Address Point Source Discharges in to the Waters of the United States BMPs are focused on “end of the pipe” solutions On-Site Low Impact Development Techniques are being Applied as BMPs in Watersheds Requires Long Term and Wholesale Application Stream Restoration through NCD would Impact TMDL Compliance and Increase Water Quality 7

  8. Conclusion Watersheds Should be Managed Comprehensively and NCD should be Considered as part of the Management Team’s Tool Box to: Meet Stream Requirements Reduce Watershed Management Costs Increase the Quality of Life in a watershed 8

  9. TWDB NCD Study KBR is Currently Preparing a Study for the State of Texas that Evaluates the Construction Costs and Feasibility of Applying NCD throughout Texas Compared to the Costs of Traditional Erosion Control Techniques. If anyone would like to be Notified when this is Published, Please come by and let me know today or e-mail me at eric.hall1@kbr.com 9

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