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Subwatershed Planning TMDLs

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Calvert County, MD

Calvert County, MD

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  • 1. Subwatershed Planning in Calvert County Maryland Prepared for the 1st Annual Choose Clean Water – Chesapeake Bay Restoration Conference
  • 2. A Clean‐up for the Bay – What to  Expect from the Bay TMDLs at the local level • TMDL effect on the planning process • TMDL integration with WRE of Comp Plans • Engaging stakeholders • Eventual implementation of pollution reduction measures
  • 3. HB 1141: Water Resources Water Resource Element A. Analyze long‐term water needs        and supplies B. Analyze the impact of sewer  treatment plants 15, 2008 September C. Analyze the impact of stormwater  (diffuse sources) 3
  • 4. But first of all, where are we?
  • 5. Calvert CountyWatersheds
  • 6. Entire Watershed –Selected Data Land Use Zoning 6
  • 7. Patuxent Tributary Goals 7 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  • 8. HB 1141: Water Resources Water Quality: Patuxent River Basin 8
  • 9. 9 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  • 10. 10 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  • 11. 11 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  • 12. HB 1141: Water Resources Water Quality: Fresh Water Stream Survey 12
  • 13. Maryland Biological Stream Survey 2000-2004 County Results Riparian Buffers 13
  • 14. Maryland Biological Stream Survey 2000-2004 County Results Physical Habitat Index 14
  • 15. Maryland Biological Stream Survey 2000-2004 County Results Nitrate-Nitrogen 15
  • 16. Maryland Biological Stream Survey 2000-2004 County Results Total Phosphorus 16
  • 17. HB 1141: Water Resources Water Quality: Based on Land Use and Pollutant Loads 17
  • 18. Impervious Surfaces Most of our subwatersheds have less than 5% impervious surfaces. Two subwatersheds would be considered ‘urban’ (more than 10% impervious surfaces.) 19
  • 19. Forest canopy is 56-58%. 60% is considered good. 20
  • 20. HB 1141: Water Resources So what can we conclude from the data? • Our nutrient loads are higher than we want. • Erosion has caused significant stream damage in places. • There are opportunities for good water quality • Impervious surfaces are still low and forest cover is still high in most watersheds. 21
  • 21. Smart Growth • Priority Preservation Areas • Priority Funding Areas • Transition areas
  • 22. HB 1141: Water Resources Best Management Practices (BMPs) and Projected Growth -Nitrogen Total Nitrogen Load 1,200,000 1,000,000 800,000 Lbs/Yr Total Septic Load 600,000 Total Terrestrial Load 400,000 200,000 0 2007 LU, 2007 LU, Scenario Scenario 2002 Trib Strat 1 Trib 2 Trib BMPs BMPs Strat Strat BMPs BMPs 23
  • 23. HB 1141: Water Resources Best Management Practices (BMPs) and Projected Growth -Phosphorus Total Phosphorus Load 70,000 60,000 50,000 Lbs/Yr 40,000 Total Phosphorus Load 30,000 20,000 10,000 0 2007 LU, 2007 LU, Scenario Scenario 2002 Trib Strat 1 Trib 2 Trib BMPs BMPs Strat Strat BMPs BMPs 24
  • 24. Best Management Practices include: Cover Crops . . . .
  • 25. Non-structural stormwater management
  • 26. Non-structural stormwater management
  • 27. HB 1141: Water Resources Best Management Practices BMPs and Projected Growth –Impervious Cover Total Impervious Cover 12,000 10,000 8,000 Acres 6,000 Total Impervious Cover 4,000 2,000 0 2007 LU, 2007 LU, Scenario Scenario 2002 Trib Strat 1 Trib 2 Trib BMPs BMPs Strat Strat BMPs BMPs 29
  • 28. HB 1141: Water Resources Best Management Practices BMPs and Projected Growth –Forest and Agriculture Forest and Agriculture 90,000 80,000 70,000 60,000 Acres 50,000 Forest 40,000 Agriculture 30,000 20,000 10,000 0 2007 LU, 2007 LU, Scenario 1 Scenario 2 2002 BMPs Trib Strat Trib Strat Trib Strat BMPs BMPs BMPs 30
  • 29. HB 1141: Water Resources Proposed Stormwater Actions (diffuse sources) 31
  • 30. HB 1141: Water Resources Include the following: •Set water quality goals. •Prepare subwatershed plans. •Continue to monitor water quality. •Include tree ordinances, with tree canopy goals, in all town center ordinances. •Update the stormwater management ordinance. 32
  • 31. By what standards should we measure water quality? Draft goals for fresh water: • <0.71 milligrams of nitrogen per liter • <0.031 milligrams of phosphorus per liter • <10 TNUs of turbidity Draft goals for tidal water: • Chlorophyll <10 micrograms per liter of water • Secchi Depth measurements > 1 meter •Oxygen levels: 4 mg/l for deep waters and 6 mg/l 33 for surface waters.
  • 32. Draft goals for urban subwatersheds > 10% impervious: •Maintain swimmable/ fishable water quality; •Improve water clarity by reducing sedimentation; •Restore aquatic diversity in freshwater streams; •Increase groundwater recharge; •Enhance waterfront access. 35
  • 33. Draft goals for rural subwatersheds < 10% impervious: Achieve the goals of the urban subwatersheds, plus the following: •Maintain or restore anadromous (fish spawning) streams •Develop and maintain shellfish beds, both sanctuary and open to harvesting. 36
  • 34. Subwatershed Master Plans • Build Partnerships • Characterize Subwatershed • Finalize Goals and Identify Solutions • Design Implementation Program • Implement Watershed Plans • Measure Progress and make adjustments.
  • 35. Mill Creek: One of two urban subwatersheds in Calvert County
  • 36. Town Centers: Stormwater from two town centers flow toward Mill Creek
  • 37. Zoning -Town Center -Residential -Employment Center
  • 38. Land Use -Commercial -Residential -Public -Undeveloped
  • 39. Contour Map The upper reaches of the subwatershed contain steep slopes
  • 40. Tree Coverage Approximately 40% of the subwatershed has tree coverage
  • 41. Sewer vs. Septic -Served by Solomons Sewer System -Served by traditional septic systems -Served by nitrogen- removing system
  • 42. Test sites Annual harbor study and the Lower Restoration Action Strategy
  • 43. First Five  Subwatershed  Plans • Hall Creek • Fishing Creek • Parker’s Creek • Gray’s Creek • Mill Creek
  • 44. Building connections with  citizens We have been: • Collecting email addresses  at public  presentations • Collecting email addresses  at community  meetings • Notifying citizens of meetings via email • Posting PowerPoints and videos on the web.
  • 45. 48
  • 46. Challenges • Creating walkable communities while protecting water quality. • Developing mitigation strategies. • Paying for infrastructure needed for smart growth. • Determining the most cost effective tools to achieve nutrient reduction. • What to do first?