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 [9]	Reinforced concrete base, fiberglass grate [10]	Under walkways, paths and roads into a rain garden [11]
Riprap check dams	<10 acres [12]		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 [13]	Riprap, coarse aggregate facing uphill side, mixture of rock sizes, nonwoven geotextile below [14]	Small open channels (not streams or rivers) with channel slopes >10% [15]	Areas conducive to erosion (sandy/silty) [16]
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 [17]	Straw, tubular UV-stabilized black synthetic netting, 18-24 in wooden stakes [18]	Newly constructed or disturbed slopes [19]
Hydro Screen	Depends on model/application	Outfall screen can handle up to 1,000 cfs [20]	Depends on model/application	Stainless steel	Downspouts, detention ponds, private property/roofs, curbs, parking lots, farms [21]