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Use of a Watershed Management Tool to Facilitate Restoration and Preservation

Anne Arundel County Maryland. Use of a Watershed Management Tool to Facilitate Restoration and Preservation Presentation given by: Mary L. Searing, P.E. Watershed Program Manager Office of Environmental & Cultural Resources Anne Arundel County

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Use of a Watershed Management Tool to Facilitate Restoration and Preservation

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  1. Anne Arundel County Maryland Use of a Watershed Management Tool to Facilitate Restoration and Preservation Presentation given by: Mary L. Searing, P.E. Watershed Program Manager Office of Environmental & Cultural Resources Anne Arundel County September 2004

  2. Partnership Approach The Development of the Watershed Management Tool and its respective components is a result of an outstanding partnership from staff of the following: • Anne Arundel County • Department of Public Works • Office of Planning and Zoning • Department of Inspection and Permits • Department of Office of Information Technologies • Office of Environmental and Cultural Resources • Health Dept, Soil Conservation District, Rec & Parks • KCI Technologies, Inc. • GeoNorth • CH2M Hill • Severn River Commission

  3. Land Use Issues • Impervious area • Storm water pollution source • Habitat quality • Water quality • Flooding

  4. http://www.deq.state.us/wqinfo/nonpoint/images/wpe25.jpg

  5. Stormwater eventually feeds into our waterways.

  6. Water Quality Point Sources Non-point Sources Water Supply Surface Ground Economic and Social Brownfield Reuse Ports and Navigation Flood Hazard Reduction Riverine Stormwater Recreation Boating and Fishing Parks Biodiversity Aquatic Riparian Watershed Management:Goals & Strategies

  7. Project Area • Current project area is Severn River Watershed • Eventually incorporate all 12 watersheds of the County into the Watershed Management Tool

  8. Project Methodology and Data • Watershed and subwatershed delineations • Existing land use • Future land use • Imperviousness data • Soil data • Topographic Information • Flow paths • Event mean concentrations (EMC) • Best management practices (BMP) • Pollutant removal efficiencies

  9. Summary and Overview of Watershed Management Tool • Utilized for: • NPDES Permitting and Compliance • Watershed-Based Land Management & Land Use Planning • Development Review • Capital Improvement Planning

  10. Overview of Functional Components of WMT&V

  11. Allow Users to: Browse Query View GIS layers Future map layers http://gis-fire/mox42/index.cfm

  12. Development Restoration & Preservation Severn River Watershed

  13. Existing condition

  14. Local Watersheds Targeted Based on: Restoration Needs • Watershed Pollution Sources • Local Concerns Restoration Opportunities • Pollution prevention • Stream restoration • Enhancement • Preservation • Opportunity to construct multiple projects & build upon existing projects

  15. Future Conditions

  16. Existing Land Use Plan Projected Land Use Changes Future Conditions, with Existing Regulations Existing Conditions 11% 12% 10% 6% 36% 2% Commercial, Industrial, Transportation Residential Agricultural, Row Crop Open Space (turf) Woods 42% 6% 69% 6% Note: Data does not include the City of Annapolis

  17. Construction BMPs Erosion Sediment Commercial/Industrial BMPs Water quality Manufacturing pollution Treatment BMPs Runoff Stormwater Runoff Reduction BMPs Low Impact Development Preservation Homeowner BMPs Surface water prevention Septic System Upgrades Watershed Management Alternatives *BMP = Best Management Practice

  18. Loading Rates of Total Phosphorus for Existing and Future Conditions

  19. Considerations for Revised Land Use Plan - Possible Restoration Alternatives • Bioretention • Dry to Wet Pond Retrofits • Wetland Mitigation • Septic System Upgrades

  20. Considerations for Revised Land Use Plan – Possible Preservation Alternatives • Stream buffers and shoreline buffers (critical area) • Greenways (100% of plan) • Wetland mitigation sites • Cluster zoning

  21. Septic System Alternative Example Data Used in Modeling

  22. Septic System Alternative Example Existing Land Use Plan Existing Conditions Jabez Branch

  23. Septic System Alternative Example Existing Land Use Plan Future Conditions Jabez Branch

  24. Cluster Zoning Example With Septic System Alternatives New Systems with Nitrogen Treatment Jabez Branch

  25. Septic System Alternative Example With Septic System Alternatives New Systems with Nitrogen Treatment & Retrofit Existing Systems Jabez Branch

  26. Septic System Alternatives Total Nitrogen Loading Comparison

  27. What does WMT&V Provide? • Data Management & Maintenance • Data Viewer with Metadata • Dynamic Models to Perform Scenarios • Project Management • Watershed-scale Assessments Better Decisions for a Better Future

  28. For more information contact: • www.severn-river-watershed.com • www.aacounty.org/LandUse/OECR/WatershedManage.cfm OR Contact Mary Searing at: 2664, Riva road Annapolis, MD 21401 PHONE # 410-222-7441 EMAIL:msearing@mail.aacounty.org

  29. North Cypress Branch Action Plan Summary • Waterway Restoration - $750,000 • Stream Restoration - $1.25 million • Channel BMP’s - $350,000 • Watershed BMP’s – up to $530,000

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