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 [9] 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 [10] Yes See manufacturer’s sizing tool (requires registration) Can accept 15 in or 24 in pipes [11] Bypass siphon, sump, filter module, outlet module [12]
Storm Clean Underground Injection Controls (UIC), swales, detention/ retention ponds, infiltration trenches [13] Yes Sized to rectangular or round catch basin, adaptive design available for larger catch basins [14]; [15]; [16] Bypass port, strainer, filter element [17]
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. [18]
Filtration berm Residential, Commercial, Industrial, Retrofit, Highway/Road, limited Ultra-Urban [19] No 8 linear feet per 1 cfs based on 10-yr, 24-hr design storm [20] Size outlets for 24-hour drawdown time [21] Suitable for most steep surface slopes [22]
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 [23]
StormExx No restriction Yes One-size fits all with modification supports [24] Treated water outlet from cartridge = 2 in diameter Bypass structure

This page was last edited on 13 April 2020, at 17:56.

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