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	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