Filtration - system and component sizing

Filtration - system and component sizing
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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