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Stormwater Filtering Design
- 1. Design of Stormwater Filtering Systems Center for Watershed Protection Copyright 2000, CWP
- 10. Copyright 2000, CWP The runoff from this parking lot in Austin, TX drains to the surface sand filter in the midpoint of this slide.
- 11. Copyright 2000, CWP Copyright 2000, CWP This slide, also from Austin, TX, shows the sedimentation chamber (foreground) and filter bed (background) of a surface sand filter. Note the combination of earthen fill to the right and a concrete shell for the filter itself.
- 14. Copyright 2000, CWP Since perimeter sand filters don’t consume surface space, they are ideal for small impervious areas, particularly those with significant pollutant load potential such as gas stations, fast food centers, and automotive repair shops.
- 15. Copyright 2000, CWP This slide shows precast concrete forms of the two chambered perimeter sand filter. Note the weir slots in the center wall, and the holes for the pipes (to the left) to carry outflows from the bottom of the sand bed to the storm drain system.
- 19. Copyright 2000, CWP This is a peat sand filter in Maryland's piedmont region that uses a vegetative cover on the surface of the filter bed.
- 20. Copyright 2000, CWP This slide shows a compost filter from the Pacific Northwest. The facility contains a small pretreatment chamber and two compost filter beds in the background.
- 23. Copyright 2000, CWP This slide shows the construction of an underground sand filter in progress.
- 26. Copyright 2000, CWP This slide shows a pocket sand filter in central Maryland. The drainage area consists of a small active recreational area, including tennis courts, basketball courts, and a community swimming pool.
- 41. Copyright 2000, CWP Here is a bioretention island in a parking lot. Note the curb cuts that allow the runoff to access the vegetated depression.
- 42. Copyright 2000, CWP Here is a similar design set up just after a rain event.
- 43. Copyright 2000, CWP This design variation receives both parking lot and street runoff.
- 44. Copyright 2000, CWP Smaller bioretention cells are easily and attractively incorporated into individual lots, as this slide shows.
- 47. Bioretention Pretreatment: Filter Strip Sizing Criteria Copyright 2000, CWP
- 48. Bioretention Pretreatment: Grass Channel Sizing Guidance Copyright 2000, CWP
Notas do Editor
- Stormwater filtering systems are a diverse group of techniques that treat stormwater runoff for water quality. One common thread is that each utilizes some kind of filtering media, such as sand, soil, gravel, peat or compost to filter pollutants entrained in stormwater runoff. Second, filtering systems are typically applied to small drainage areas (five acres or less). Third, filtering systems are designed solely for pollutant removal. Flows greater than the water quality treatment volume are bypassed around the filter to a downstream stormwater management facility. Filtering systems incorporate four basic design components in every application: inflow regulation that diverts a defined flow volume into the system a pretreatment technique to capture coarse sediments the filter bed surface and unique filter media an outflow mechanism to return treated flows back to the conveyance system and/or safely handle storm events that exceed the capacity of the filter This slide show presents basic design guidance for stormwater filtering systems, which include surface sand filters, perimeter filters, organic filters, underground filters, pocket sand filters, and bioretention. The design criteria are similar for all of the variations of filters. For a more detailed discussion, please refer to the 1996 Center for Watershed Publication entitled Design of Stormwater Filtering Systems .