Filtration - system and component sizing
Filtration - system and component sizing
Link to this table
| Device | Land use | Downstream BMP (type) | Enhancement opportunity | Sizing calculations | Inlets/oulets | Flow diversion structures | Slopes |
|---|---|---|---|---|---|---|---|
| Pretreatment vegetated filter strip (VFS) | Often not suitable for in ultra-urban settings where space is limited or areas with high pollutant loading [1] | Infiltration, Retention [2] | No | Depends on slope and imperviousness of drainage area: See MPCA table entitled “Guidelines for filter strip pre-treatment sizing” | Outflow 2-3 inches above filter strip [3] | May include pervious berm or check dam, which should have an outlet pipe or overflow weir [4] | 2-6% depending on soil, 0% perpendicular to flow [5] |
| Level-Spreader - Vegetative Filter Strip System (LS-VFS) | Often not suitable for in ultra-urban settings where space is limited or areas with high pollutant loading [6] | Infiltration, Retention [7] | No | LS length: 10 ft/cfs, VFS sized for a 1 in/hr storm (larger flows bypassed) | Outflow 2-3 inches above filter strip [8] | May include flow bypass, forebay and/or blind swale, and underdrain | Depth at inlet = 3 ft, depth before outlet = 1 ft |
| Up-Flo Filter | Suited to industrial sites, locations contributing to wetlands/protected regions or area requiring high level of treatment | Yes | See manufacturer’s sizing tool (requires registration) | Can accept 15 in or 24 in pipes | Bypass siphon, sump, filter module, outlet module | ||
| Storm Clean | Underground Injection Controls (UIC), swales, detention/ retention ponds, infiltration trenches | Yes | Sized to rectangular or round catch basin, adaptive design available for larger catch basins | Bypass port, strainer, filter element | |||
| Gravel filtration | Areas with high erosion concern such as construction sites. | No | Each gravel bag can be adjusted to meet specific flow, sediment, or filtration requirements | ||||
| Filtration berm | Residential, Commercial, Industrial, Retrofit, Highway/Road, limited Ultra-Urban [9] | No | 8 linear feet per 1 cfs based on 10-yr, 24-hr design storm [10] | Size outlets for 24-hour drawdown time [11] | Suitable for most steep surface slopes [12] | ||
| SiltSoxx R by Filtrexx | Construction, Residential, Commercial | No restriction | Yes | Flow-based, see time to overflow at different flow rates (1-7.5 gpm/linear ft) for each size in Table 1 | Slope up to 1:1 grade [13] | ||
| StormExx | No restriction | Yes | One-size fits all with modification supports [14] | Treated water outlet from cartridge = 2 in diameter | Bypass structure |
This page was last edited on 3 August 2022, at 19:05.