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Subwatershed Planning
     in Calvert County Maryland

Prepared for the
1st Annual Choose Clean Water –

Chesapeake Bay Re...
A Clean‐up for the Bay – What to 
Expect from the Bay TMDLs at the local level

 • TMDL effect on the planning process
 • ...
HB 1141: Water Resources


             Water Resource Element

   A. Analyze long‐term water needs       
      and suppl...
But first of all,
where are we?
Calvert CountyWatersheds
Entire Watershed –Selected Data




Land Use                 Zoning       6
Patuxent Tributary
                Goals




                                                                             ...
HB 1141: Water Resources




            Water Quality:
         Patuxent River Basin




                                8
9
Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
10
Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
11
Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
HB 1141: Water Resources




         Water Quality: Fresh
         Water Stream Survey




                              ...
Maryland Biological Stream Survey 2000-2004 County Results




                                       Riparian Buffers



...
Maryland Biological Stream Survey 2000-2004 County Results




                                       Physical Habitat
   ...
Maryland Biological Stream Survey 2000-2004 County Results




                                       Nitrate-Nitrogen



...
Maryland Biological Stream Survey 2000-2004 County Results




                                       Total
              ...
HB 1141: Water Resources

             Water Quality: Based on
             Land Use and Pollutant
             Loads




...
Impervious
    Surfaces

Most of our
subwatersheds have
less than 5%
impervious surfaces.

Two subwatersheds
would be cons...
Forest canopy is
 56-58%.

60% is
considered good.




                   20
HB 1141: Water Resources



      So what can we conclude
      from the data?

• Our nutrient loads are higher than we wa...
Smart Growth
 • Priority
   Preservation Areas
 • Priority Funding
   Areas
 • Transition areas
HB 1141: Water Resources



            Best Management Practices (BMPs)
             and Projected Growth -Nitrogen
     ...
HB 1141: Water Resources



            Best Management Practices (BMPs)
            and Projected Growth -Phosphorus
    ...
Best Management Practices
include: Cover Crops . . . .
Non-structural
 stormwater
management
Non-structural
 stormwater
management
HB 1141: Water Resources



          Best Management Practices BMPs and
           Projected Growth –Impervious Cover
   ...
HB 1141: Water Resources



   Best Management Practices BMPs and
  Projected Growth –Forest and Agriculture
             ...
HB 1141: Water Resources




                           Proposed Stormwater
                           Actions
           ...
HB 1141: Water Resources


  Include the following:

•Set water quality goals.
•Prepare subwatershed plans.
•Continue to m...
By what standards should we
    measure water quality?
Draft goals for fresh water:
• <0.71 milligrams of nitrogen per lit...
Draft goals for urban
subwatersheds > 10% impervious:

•Maintain swimmable/ fishable
water quality;
•Improve water clarity...
Draft goals for rural subwatersheds
    < 10% impervious:
Achieve the goals of the urban
subwatersheds, plus the following...
Subwatershed Master Plans
• Build Partnerships
• Characterize Subwatershed
• Finalize Goals and Identify
  Solutions
• Des...
Mill Creek:
 One of two urban
 subwatersheds in
 Calvert County
Town Centers:
Stormwater from
two town centers
flow toward Mill
Creek
Zoning
-Town Center
-Residential
-Employment Center
Land Use
-Commercial
-Residential
-Public
-Undeveloped
Contour Map
The upper reaches
of the subwatershed
contain steep slopes
Tree Coverage
Approximately
40% of the
subwatershed has
tree coverage
Sewer vs. Septic
-Served by
Solomons Sewer
System
-Served by
traditional septic
systems
-Served by nitrogen-
removing syst...
Test sites
Annual harbor
study and the
Lower Restoration
Action Strategy
First Five 
     Subwatershed 
         Plans
•   Hall Creek
•   Fishing Creek
•   Parker’s Creek
•   Gray’s Creek
•   Mil...
Building connections with 
                citizens
We have been:

• Collecting email addresses  at public 
  presentation...
48
Challenges


• Creating walkable communities while protecting
water quality.
• Developing mitigation strategies.
• Paying ...
Subwatershed Planning TMDLs
Subwatershed Planning TMDLs
Subwatershed Planning TMDLs
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Subwatershed Planning TMDLs

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Calvert County, MD

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Subwatershed Planning TMDLs

  1. 1. Subwatershed Planning in Calvert County Maryland Prepared for the 1st Annual Choose Clean Water – Chesapeake Bay Restoration Conference
  2. 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. 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. 4. But first of all, where are we?
  5. 5. Calvert CountyWatersheds
  6. 6. Entire Watershed –Selected Data Land Use Zoning 6
  7. 7. Patuxent Tributary Goals 7 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  8. 8. HB 1141: Water Resources Water Quality: Patuxent River Basin 8
  9. 9. 9 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  10. 10. 10 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  11. 11. 11 Maryland Tributary Strategy Patuxent River Basin, Summary Report for 1985-2005 Data, August 2007
  12. 12. HB 1141: Water Resources Water Quality: Fresh Water Stream Survey 12
  13. 13. Maryland Biological Stream Survey 2000-2004 County Results Riparian Buffers 13
  14. 14. Maryland Biological Stream Survey 2000-2004 County Results Physical Habitat Index 14
  15. 15. Maryland Biological Stream Survey 2000-2004 County Results Nitrate-Nitrogen 15
  16. 16. Maryland Biological Stream Survey 2000-2004 County Results Total Phosphorus 16
  17. 17. HB 1141: Water Resources Water Quality: Based on Land Use and Pollutant Loads 17
  18. 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. 19. Forest canopy is 56-58%. 60% is considered good. 20
  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. 21. Smart Growth • Priority Preservation Areas • Priority Funding Areas • Transition areas
  22. 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. 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. 24. Best Management Practices include: Cover Crops . . . .
  25. 25. Non-structural stormwater management
  26. 26. Non-structural stormwater management
  27. 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. 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. 29. HB 1141: Water Resources Proposed Stormwater Actions (diffuse sources) 31
  30. 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. 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. 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. 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. 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. 35. Mill Creek: One of two urban subwatersheds in Calvert County
  36. 36. Town Centers: Stormwater from two town centers flow toward Mill Creek
  37. 37. Zoning -Town Center -Residential -Employment Center
  38. 38. Land Use -Commercial -Residential -Public -Undeveloped
  39. 39. Contour Map The upper reaches of the subwatershed contain steep slopes
  40. 40. Tree Coverage Approximately 40% of the subwatershed has tree coverage
  41. 41. Sewer vs. Septic -Served by Solomons Sewer System -Served by traditional septic systems -Served by nitrogen- removing system
  42. 42. Test sites Annual harbor study and the Lower Restoration Action Strategy
  43. 43. First Five  Subwatershed  Plans • Hall Creek • Fishing Creek • Parker’s Creek • Gray’s Creek • Mill Creek
  44. 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. 45. 48
  46. 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?

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