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A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Stormwater Mainte...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Course Schedule
AM session (includes two 15 minute breaks)
– History ...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
• Provides some qu...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
Properly Functioni...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
5
Picture: VDEQ St...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
Sediment Accumulat...
Stormwater Maintenance Awareness Training
Above Ground Facilities-Infiltration Trenches (TR)
Deficiencies Requiring Action...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
Turf Covered TRs
8...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
Cleanouts/Observat...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
• Common Remedies
...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Infiltration Trenches (TR)
• Common Remedies
...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
• Alternative paving ...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
Key components
13
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
Key components
14
Pic...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
Deficiencies Requirin...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
Outfall Structure/Und...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
• Common Remedies
– R...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Permeable Pavement (PP)
• Common Remedies
– R...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Rooftop Detention (RT)
• Designed to slow the...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Rooftop Detention (RT)
Properly Functioning E...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Rooftop Detention (RT)
Deficiencies Requiring...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Rooftop Detention (RT)
Parapet Walls, Vegetat...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Rooftop Detention (RT)
• Common Remedies
– Re...
Stormwater Maintenance Awareness Training
MSMD/DPWES
Above Ground Facilities-Rooftop Detention (RT)
• For more information...
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Stormwater Maintenance Awareness Training, Part III: Above Ground Facilities, October 6, 2015

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Stormwater Maintenance Awareness Training, Part III: Above Ground Facilities, October 6, 2015

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Stormwater Maintenance Awareness Training, Part III: Above Ground Facilities, October 6, 2015

  1. 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Stormwater Maintenance Awareness Training For privately maintained stormwater management facilities Maintenance and Stormwater Management Division (MSMD) Fall 2015
  2. 2. Stormwater Maintenance Awareness Training MSMD/DPWES Course Schedule AM session (includes two 15 minute breaks) – History of SWM and regulations – County inspection basics – The inspection report and MAR – Common SWM/BMP types • Common maintenance issues-General – Common SWM/BMP types, deficiencies, and remedies • Above Ground Facilities (the rest of the story….) 12:00-1:00 PM Lunch PM session (includes two 15 minute breaks) – Common SWM/BMP types, deficiencies, and remedies • Below Ground Facilities • Vegetative Practices – Closing remarks/questions 2 NOTE: All pictures, unless noted, are the property of Fairfax County.
  3. 3. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) • Provides some quantity control and treats runoff through filtration/infiltration 3
  4. 4. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) Properly Functioning Examples: (Typical single-family residential lot facilities) 4 LEFT: Picture shows a gravel infiltration trench with a cleanout and observation well, during a soil probe test. A soil probe is pushed into the underlying gravel layer to determine the topsoil depth and confirm facility is “per design”.
  5. 5. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) 5 Picture: VDEQ Stormwater Design Specification No. 8, Infiltration Practices, Version 1.9, 3/1/11
  6. 6. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) Sediment Accumulation and Curb Cuts 6 TOP LEFT: Some debris and sediment on surface at curb cut BOTTOM LEFT: Curb cut blocked (remove wheel stop) TOP RIGHT: Surface debris & sediment accumulation BOTTOM RIGHT: Sediment accumulation in gravel bed
  7. 7. Stormwater Maintenance Awareness Training Above Ground Facilities-Infiltration Trenches (TR) Deficiencies Requiring Action: Plantings and Overgrown Vegetation 7 Downed tree limb with deep- rooted/overgrown vegetation Overgrown vegetation within the limits of a gravel bed trench may indicate sediment accumulation, as plants do not tend to grow in clean gravel. Unauthorized plantings MSMD/DPWES
  8. 8. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) Turf Covered TRs 8 Some trenches may have turf and topsoil, covering the gravel bed; however, turf is not automatically acceptable. ALWAYS refer to the approved site plan! • A soil probe test checks the gravel layer (refer to slide 4). • Water usually reaches the gravel bed through underground PVC pipes connected to the roof drain downspouts. Common issues include: • Missing underground gravel beds • Disconnected roof downspouts draining overland instead of via an underground pipe • Bare spots/exposed soil in turf covering • Missing berms or observation wells
  9. 9. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) Cleanouts/Observation Wells 9 Other common issues: • Caps stuck/not removable • Clogged cleanouts • Presence of standing water in the cleanout Broken/damaged well cap Missing cap
  10. 10. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) • Common Remedies – Remove all flow blockages as well as any additional trash, debris, and accumulated sediment • Special attention should be given, as required to gravel beds (surface and within gravel pores) and may require removal/replacement of clogged sections of gravel • Fully remove any plants growing in the accumulated sediments – Full removal includes eliminating roots and supporting soil/sediment from the gravel bed, as spraying weed killer is not a sufficient treatment solution – Rebuild/stabilize any areas with erosion, cave-ins, and bare spots: • Cave-ins require additional investigation to determine cause and prevent re-occurrence 10
  11. 11. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Infiltration Trenches (TR) • Common Remedies – Repair/replace any damaged/missing components • Components vary by facility type and design, and they can range from parts to structural to environmental materials (see prior noted examples) – Check approved site plans for specific facility requirements • For damaged/misaligned pipes: – Reinforce/repair, if possible (Internal bands and gaskets) – Slip-line pipes when possible, as this may be most cost effective – Excavate and replace/reseal, if first two options are not possible – Cut back overgrown vegetation around facility structures to facilitate access and proper function 11
  12. 12. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) • Alternative paving surface which treats runoff through filtration (voids in paved surface), temporary storage (underlying stone reservoir), and infiltration – Includes permeable pavement, pervious concrete, porous asphalt, and permeable pavers – PP promotes a high degree of runoff volume reduction & nutrient removal – Primarily used in commercial, institutional, & residential sites 12 Properly Functioning Examples:
  13. 13. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) Key components 13
  14. 14. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) Key components 14 Picture: VDEQ Stormwater Design Specification No. 7, Permeable Pavement, Version 1.8, 3/1/11, Figure 7.1 (as noted)
  15. 15. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) Deficiencies Requiring Action Pervious Layer 15 Sediment/Silt Weeds/overgrown vegetation Deterioration &/or cracks in pervious layer
  16. 16. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) Outfall Structure/Underdrain 16 Damaged underdrains Clogging and/or a potential blockage in the outfall structure/underdrain Blockage in the underdrain
  17. 17. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) • Common Remedies – Remove all flow blockages as well as any additional trash, debris, and accumulated sediment • Perform a thorough restorative vacuum sweep of paved surface • Investigate the causes of any blockages to prevent re-occurrence, if at all possible. – Repair/replace any damaged/missing components • Components vary by facility type and design, and they can range from parts to structural to environmental materials (see prior noted examples) – Check approved site plans for specific facility requirements • Specific to this facility type: any damaged, cracked, or failing pavers or paved sections 17
  18. 18. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Permeable Pavement (PP) • Common Remedies – Rebuild/stabilize any areas with erosion, cave-ins, and bare spots: • Cave-ins require additional investigation to determine cause and prevent re-occurrence – Cut back overgrown vegetation around facility structures to facilitate access and proper function • Remove any non-spec vegetation, especially if it impacts the health and function of the facility, as designed. 18
  19. 19. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Rooftop Detention (RT) • Designed to slow the flow from the roof through short-term ponding on the roof surface 19 Properly Functioning Examples of Rooftop Detention Devices: Ring with 1” holes Slotted square detention device Adjustable detention device Custom devices
  20. 20. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Rooftop Detention (RT) Properly Functioning Examples: Scuppers convey emergency overflow off rooftop 20
  21. 21. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Rooftop Detention (RT) Deficiencies Requiring Action Scuppers and Adjustable Detention Devices 21 Scupper not providing proper water detention because it is level with roof Adjustable detention device opened too wide Detention device and debris cage missing Debris cage is damaged and detention device missing
  22. 22. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Rooftop Detention (RT) Parapet Walls, Vegetation, and Detention Devices 22 Parapet wall missing Debris Sediment Sediment Tree growing on roof surface
  23. 23. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Rooftop Detention (RT) • Common Remedies – Remove all flow blockages as well as any additional trash, debris, and accumulated sediment – Repair/replace any damaged/missing components • Components vary by facility type and design, and they can range from parts to structural to environmental materials (see prior noted examples) – Check approved site plans for specific facility requirements – Remove ANY vegetation around facility structures and on rooftop – Provide required detention flow rate • Replace any missing or damaged detention devices and debris cages • Re-adjust detention devices, as needed • Raise scuppers that are too low or provide detention at the scupper • Repair or install any missing parapet walls 23
  24. 24. Stormwater Maintenance Awareness Training MSMD/DPWES Above Ground Facilities-Rooftop Detention (RT) • For more information call 703-877-2800, TTY 711 • Maintenance and Stormwater Management • Department of Public Works and Environmental Services • Fairfax County, Va. • www.fairfaxcounty.gov 24

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