Screening and straining devices tables combined
Contents
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. |