Screening and straining devices tables combined Screening and straining devices tables combined

Screening and straining devices - general information

Screening and straining devices - general information
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Device	Proprietary/nonproprietary	Above ground or below ground	Pollutants removed
Rain Guardian - Bunker	Proprietary	Below grade	Litter and coarse debris, sediment
Rain Guardian - Turret	Proprietary	Below grade	Litter and coarse debris, sediment
Rain Guardian - Foxhole	Proprietary	Below grade	Litter and coarse debris, sediment
Riprap check dams	Nonproprietary	Above ground	Sediment
Wattles	Proprietary/nonproprietary	Above ground	Sediment, organic matter
Hydro Screen	Proprietary	Above ground/below ground	Trash, debris, organics

Screening and straining devices - system design information

Screening and straining devices - system design information
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Device	Drainage area	Entrance velocity	Dimensions	Materials	Layout Recommendations (physical location, off-line placement)	Soils
Rain Guardian - Bunker		Up to 6.11 cfs [1]	Standard exterior dimensions = 51.25 in L x 20 in W x 15.75 in H, Designed for garden standard ponding depth of 9 in or 12 in [2]	95% recycled plastic lumber [3]	Residential bioretention (rain gardens) [4]
Rain Guardian - Turret		Up to 3.45 cfs [5]	46 in by 50 in base, 19.5 in total height, designed for garden standard ponding depth of 12 in [6]	Reinforced concrete base, fiberglass grate [7]	Parking lot rain gardens and high traffic areas [8]
Rain Guardian - Foxhole			2 ft 11 in W x 1 ft 7 in H x As Long as Needed in 3 ft increments	Reinforced concrete base, fiberglass grate	Under walkways, paths and roads into a rain garden [9]
Riprap check dams	<10 acres [10]		4-5 ft wide at the bottom, 1.5 to 2 ft wide at the top, 1.5 to 2 ft high, side slopes no steeper than 2:1 [11]	Riprap, coarse aggregate facing uphill side, mixture of rock sizes, nonwoven geotextile below [12]	Small open channels (not streams or rivers) with channel slopes >10% [13]	Areas conducive to erosion (sandy/silty) [14]
Wattles	Not available, although perhaps similar to silt fence <0.25 acre		Two sizes: 9 in diameter x 25 ft long and 12 in diameter x 20 ft long, wooden stakes through wattle into soil every 3-4 ft [15]	Straw, tubular UV-stabilized black synthetic netting, 18-24 in wooden stakes [16]	Newly constructed or disturbed slopes [17]
Hydro Screen	Depends on model/application	Outfall screen can handle up to 1,000 cfs [18]	Depends on model/application	Stainless steel	Downspouts, detention ponds, private property/roofs, curbs, parking lots, farms [19]

Screening and straining devices - system and component sizing

Screening and straining devices - system and component sizing
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Device	Land use	Downstream BMP (type)	Enhancement opportunity	Sizing calculations	Inlets	Outlets	Flow diversion structures
Rain Guardian - Bunker	Residential (recommended)	Bioretention	No		Inlet flush with street surface, see detailed schematic	See detailed schematic
Rain Guardian - Turret	Commercial and Industrial areas	Bioretention	Yes		Inlet flush with street surface, See detailed schematic [20]	See detailed schematic [21]
Rain Guardian - Foxhole	Multiple/various	Bioretention	No		See detailed schematic [22]
Riprap check dams	Multiple/various		No		NA	NA	Optional shallow pool upstream of check [23]
Wattles	Multiple/various		No	Depends on application	NA	NA	NA
Hydro Screen (multiple model sizes)	Commercial, Industrial, Residential, Agricultural [24]		Yes	Depends on application	NA	NA	Depends on model, most have bypass capabilities

Screening and straining devices - installation and maintenance recommendations

Screening and straining devices - installation and maintenance recommendations
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Device	Installation notes	Frequency of inspections	Maintenance checklist (link)	Permitted on private land/ Maintenance agreement recommended	Practices for minimizing sediment and trash buildup	Practices for mitigating erosion	Cost considerations (equipment needed and man hours)
Rain Guardian - Bunker	Specifications and installation notes available here	Following rain events [25]	Maintenance guide		Remove debris if grate is clogged, chamber is >75% full, or vertical filter wall is clogged [26]	NA	Simple hand tools; <5 minutes
Rain Guardian - Turret	Specifications and installation notes available here	Following rain events [27]	Maintenance guide		Remove debris if grate is clogged, chamber is >75% full, or vertical filter wall is clogged [28]	NA	Simple hand tools; <5 minutes
Rain Guardian - Foxhole	Specifications and installation notes available here	Following rain events [29]	Maintenance guide		Remove debris if grate is clogged, chamber is >75% full, or vertical filter wall is clogged [30]	NA	Simple hand tools; <5 minutes
Riprap check dams	General installation guidelines available here	Following each runoff event, especially after rainfall exceeding 0.5 inches [31]	Maintenance guide		Remove sediment adjacent to and behind check dam before it reaches halfway to the top, repair and restore dam [32]	To the extent feasible, use erosion prevention practices such as stabilization rather than sediment control practices, restabilization of areas where sediment removal results in exposed soil [33]
Wattles	Installation guide here	Following rain events			Frequent sediment removal is necessary	NA
Hydro Screen	No information available. Must call.	No information available. Must call.	No information available. Must call.	No information available. Must call.	No information available. Must call.	No information available. Must call.	No information available. Must call.