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Difficult Run at Brittenford Drive Information Meeting May 17, 2017

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This project will mitigate flooding, reduce erosion, and protect public and private property. Approximately 3,000 feet of the main channel and 1,500 feet of tributaries will be restored.

Publié dans : Environnement
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Difficult Run at Brittenford Drive Information Meeting May 17, 2017

  1. 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Difficult Run Tributary @ Brittenford Drive Stream Restoration Project Hunter Mill District May 2017 INFORMATION MEETING Concept Plan
  2. 2. Stormwater Planning Division Agenda Why? • Social Goals • Program Drivers • Environmental Benefits • Watershed - Watershed Assessment and Characterization How? • Project Implementation Strategies • Stream Restoration • Approaches • Examples • Design Development When? • Timeline/Next Steps 2
  3. 3. Stormwater Planning Division Social Goals 3 1. Maintain open dialog and share information. 2. Coordinate with all the stakeholders and the community. 3. Build partnerships with local organizations such as Homeowners Associations. 4. Design Team – Wetland Studies and Solutions, Stormwater Planning Division, Urban Forest Management Division, Park Authority, and Utilities Design and Construction Division.
  4. 4. Stormwater Planning Division Program Drivers 4 • State and Federal Regulations  Chesapeake Bay Agreement Partnering states (VA, MD, DC, DE, PA, WV) signed the agreement to restore the bay health and ecosystem.  Municipal Separate Storm Sewer Permit (MS-4) Easements rights and responsibility to maintain/upgrade  Local TMDLs (Total Maximum Daily Loads – sediment, bacteria, PCBs) Regulates amounts of pollutants in waterways • Public Safety  Erosion control  Flooding  Snow removal • Maintenance of existing facilities • Dam Regulations
  5. 5. Stormwater Planning Division Environmental Benefits 5 Improve watershed conditions and reduce downstream impacts through…. Controlling quantity Mitigate flooding where possible Controlling velocity Reduce erosion Protect infrastructure and properties (private and public)
  6. 6. Stormwater Planning Division Watersheds/Drainage Areas Difficult Run > The Potomac River > The Chesapeake Bay… • ~ 58 square miles • ~ 145 miles of stream Difficult Run Stream Assessment  Physical Assessment: 130 Miles (conducted in 2002)  Results:  Poor condition with severely incised stream and significant portion with unstable banks – 88% channels  Most of watershed’s tributaries in widening stage  Habitat Assessment: Results: ~ 1% excellent, ~16% Good, ~48% Fair, ~34% Poor, ~1% Very poor  DEQ listed portions of the Difficult Run Watershed as impaired waters (impairments: pathogens, benthic)  TMDLs: E. Coli, Sediment 6 Difficult Run Watershed: Watershed Characteristics/Stream Assessment For details: http://www.fairfaxcounty.gov/dpwes/watersheds/difficultrun.htm
  7. 7. Stormwater Planning Division Project Implementation Strategies 7 Implementation Strategies (Fairfax County - 400 Sq. Mi.):  Watershed Management Plan  Developed for 30 watersheds  Priority areas for retrofits/restoration – project are selected based on the plan  Ongoing Maintenance Issues  Downstream dry pond 1473DP  Immediate safety and severe erosion issues
  8. 8. Stormwater Planning Division Current Condition: - Incised channel - Eroded bed and banks - Unstable slopes - Exposed Utilities 8 Proposed Project Project Goals: Restore ~3000 feet of main channel and ~ 1500 feet of tributaries  Stabilize streambed and banks  Reduces sediment and nutrient inputs into stream system  Improve habitat  Protect Infrastructure (properties, utilities, etc.)
  9. 9. Stormwater Planning Division Existing conditions 9
  10. 10. Stormwater Planning Division Existing conditions (cont’d) 10
  11. 11. Stormwater Planning Division Existing conditions (cont’d) 11
  12. 12. Stormwater Planning Division 12 Restoration Approaches
  13. 13. Stormwater Planning Division 13 Restoration Approaches (contd.)
  14. 14. Stormwater Planning Division 14 Restoration Approaches (contd.)
  15. 15. Stormwater Planning Division 15 Restoration Approaches (contd.)
  16. 16. Stormwater Planning Division 16 Restoration Approaches Design Elements –Typical Structures
  17. 17. Stormwater Planning Division 17 Videos of Typical Structures Used
  18. 18. Stormwater Planning Division Construction Example 18
  19. 19. Stormwater Planning Division Post Construction Example 19 Immediate After Construction Growing Season Following Construction Completion
  20. 20. Stormwater Planning Division Post Construction 20 One Year After Construction Three Years After Construction
  21. 21. Stormwater Planning Division Example Projects: Government Center Stream Restoration Before & After 21 Before After
  22. 22. Stormwater Planning Division Example Projects: Poplar Springs, Burke Before & After 22 Before After
  23. 23. Stormwater Planning Division Example Projects: Rabbit Branch Before & After 23 Before After
  24. 24. Stormwater Planning Division Existing Conditions 24 Reach Existing Length [ft] Main Channel 3637 Tributary 1 194 Tributary 2 271 Tributary 3 443 Tributary 4 452 Tributary 5 44 Tributary 6 472 Tributary 7 659 Total 6171 Existing Channel Details: • Main channel + 7 tributaries, 6171 ft total • Drainage area = 459 acres = 0.72 mi2 • 7 sanitary sewer crossings
  25. 25. Stormwater Planning Division Design – Proposed Cross Sections 25 Reach 1: WBKF = 19.0 ft DMAX-BKF = 2.0 ft ABKF = 24.3 ft2 Reach 2: WBKF = 22.0 ft DMAX-BKF = 2.3 ft ABKF = 32.7 ft2
  26. 26. Stormwater Planning Division Design – Proposed Alignment 26 Reach Existing Length [ft] Restored Length [ft] Main Channel 3637 2839 Tributary 1 194 40 Tributary 2 271 121 Tributary 3 443 364 Tributary 4 452 464 Tributary 5 44 47 Tributary 6 472 249 Tributary 7 659 502 Total 6171 4626
  27. 27. Stormwater Planning Division Design – Proposed Access 27
  28. 28. Stormwater Planning Division Design – Grading Plan and Profile 28
  29. 29. Stormwater Planning Division Upstream Culvert 29
  30. 30. Stormwater Planning Division Design – Grading Plan and Profile 30
  31. 31. Stormwater Planning Division Design – Sanitary Crossing 31
  32. 32. Stormwater Planning Division Design – Grading Plan and Profile 32
  33. 33. Stormwater Planning Division Design – Grading Plan and Profile 33
  34. 34. Stormwater Planning Division Design – Grading Plan and Profile 34
  35. 35. Stormwater Planning Division Design – Grading Plan and Profile 35
  36. 36. Stormwater Planning Division Design – Sanitary Crossing 36
  37. 37. Stormwater Planning Division Design – Grading Plan and Profile 37
  38. 38. Design – Sanitary Crossing 38
  39. 39. Design – Sanitary Crossing 39
  40. 40. Stormwater Planning Division Design – Grading Plan and Profile 40
  41. 41. Stormwater Planning Division Design – Sanitary Crossing 41
  42. 42. Stormwater Planning Division Design – Grading Plan and Profile 42
  43. 43. Stormwater Planning Division Downstream Pond 43
  44. 44. Stormwater Planning Division Design – Grading Plan and Profile 44
  45. 45. Stormwater Planning Division Tributary 1 Trail Crossing 45
  46. 46. Stormwater Planning Division Design – Grading Plan and Profile 46
  47. 47. Stormwater Planning Division Design – Sanitary Crossing 47
  48. 48. Stormwater Planning Division 48
  49. 49. Stormwater Planning Division Design – Grading Plan and Profile 49
  50. 50. Stormwater Planning Division Design – Grading Plan and Profile 50
  51. 51. Stormwater Planning Division Design – Grading Plan and Profile 51
  52. 52. Stormwater Planning Division Tributary 6 Trail Crossing 52
  53. 53. Stormwater Planning Division Design – Grading Plan and Profile 53
  54. 54. Stormwater Planning Division Tributary 7 – Exposed Utilities and Pipe 54
  55. 55. Stormwater Planning Division Design – Grading Plan and Profile 55
  56. 56. Stormwater Planning Division Tributary 7 Trail Crossing 56
  57. 57. Stormwater Planning Division Tree Inventory 57
  58. 58. Stormwater Planning Division Forest Edge Restoration 58
  59. 59. Stormwater Planning Division Forest Edge Restoration 59
  60. 60. Stormwater Planning Division Timeline and next steps 60 • Survey & Data Collection - October, 2016 • Hydrology Assessment & Layout Sketch - December, 2016 – Pre-design meeting • Conceptual design - March, 2017 • Concept revision - June, 2017 • Design Completion - December, 2017 • Construction - Dependent on future funding
  61. 61. Additional Information For additional information, please contact Stormwater Planning Division 61 Sajan Pokharel 703-324-5687 Email: Sajan.Pokharel@fairfaxcounty.gov To request this document in an alternate format, call 703-324- 5500, TTY 711, or email SWPDmail@fairfaxcounty.gov www.fairfaxcounty.gov/publicworks/stormwater

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