Pretreatment system design information - all devices Revision as of 21:31, 22 January 2024 by PKalinosky (talk | contribs)
Revision as of 21:31, 22 January 2024 by PKalinosky (talk | contribs)
Pretreatment system design information - all devices. NOTE: we have not maintained the links in these tables. If you want to find a link, go to this page, which is more likely to have updated links.
Link to this table
| Device | Primary mechanism | Drainage area | Entrance velocity | Dimensions | Materials | Layout Recommendations (physical location, off-line placement) | Soils |
|---|---|---|---|---|---|---|---|
| Vortechs TM by Contech | Hydrodynamic separation | <10 acres, recommended <5 acres with <1-acre impervious cover1, 2 | 1.6-25 cfs3 | 9 standard sizes: 9 ft x 3 ft to 18 ft x 12 ft3 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks. Can be online or off-line.3, 4 | ||
| Continuous Deflective Separation (CDS) R by Contech | Hydrodynamic separation | <10 acres, recommended <5 acres with <1-acre impervious cover5, 6 | Inline up to 6 cfs, offline precast modules 3-62 cfs, offline cast in place up to 300 cfs7, 8 | 16 models: 3-10 ft diameter8 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks9 | ||
| Downstream Defender TM H.I.L. Technology | Hydrodynamic separation | <10 acres, recommended <5 acres with <1-acre impervious cover10, 11 | 1.6-24 cfs for 50% removal of 100-micron particles, peak flow rate 3-38 cfs12 | Predesigned manhole sizes: 4-12 ft in diameter, custom: up to 40 ft in diameter; Depth: 3.33 - 9.42 ft13, 14 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks15 | ||
| First Defense R by Hydro International | Hydrodynamic separation | 0.85-6.0 cfs for 50% TSS Removal16 | Six models: Diameter= 3-8 ft, Depth = 3.75-8 ft16 | At point of entry into drainage line, sites constrained by space, topography, or drainage profiles, and retrofit installations16 | |||
| Stormceptor R by Imbrium or Rinker Materials | Varies from 1 acre to 150 acres depending on model, common in-line models can treat 0.55-6.7 acres impervious cover17, 18 | 8 prefabricated in-line models, 1 48-in diameter inlet model, large-scale MAX model18 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks. Extended Oil Storage and Oil and Sand Removal Systems available for hot spot areas. Can be inlet or in-line, single or in series19, 20 | ||||
| Barracuda by BaySaver | Hydrodynamic separation | Recommended <5 acres with <1-acre impervious cover21 | 50% TSS removal: 1.25 cfs, Maximum: 6.25 cfs22 | 6 manhole models: 36-120 in diameters22 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks | ||
| Dual Vortex Separator by OldCastle | Hydrodynamic separation | 0.56 – 9 cfs23 | Multiple sizes for both square manhole and square grated inlet models: 36 in to 144 in diameter24 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks. Can be online or offline24 | |||
| SciClone TM by BioClean | Hydrodynamic separation | WQ flow rate = 0.7-6.3 cfs25 | Twelve models: 3-14 ft diameter, storage capacity 11-231 cu ft26 | Small footprints of predesigned models are suitable for urban areas and as a retrofit to existing networks27 | |||
| Rain Guardian - Bunker | Screening and straining | 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 | Screening and straining | 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 | Screening and straining | 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 | Screening and straining | <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 | Screening and straining | 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 | Screening and straining | 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] | |
| Pretreatment row on underground storage/filtration | Above ground and below grade storage and settling | Varies widely, units may be placed in parallel and series to accommodate | Varies. Limiting factor is site footprint available. | Rigid chamber, gravel | In-line, ideal under parking lots and areas with tight footprints | Ideally highly infiltrative to achieve volume reduction | |
| StormTech Isolator Row | Above ground and below grade storage and settling | Varies widely, units may be placed in parallel and series to accommodate | See flow Table 2 | Max length of row = 175 ft, but multiple rows may be used, see dimensions table for models SC-310, SC-310-3, SC-780, MC-3500 and MC-4500 [22] | Two layers of woven geotextile, StormTech chamber, non-woven fabric if model has perforated side walls, gravel [23] | In-line, after a manhole with a high flow weir. System is ideal under parking lots and roadways and areas with tight footprints [24] | Ideally highly infiltrative to achieve volume reduction [25] |
| Settling chamber/vault | Above ground and below grade storage and settling | Can accommodate most drainage areas for downstream BMP [26] | Exit velocity to surface media filters should be non-erosive [27] | Recommended length to width ratio of 2:1 | |||
| Oil/water/grit separators | Above ground and below grade storage and settling | <1 acre impervious cover [28] | 1-3 ft/min or less [29] | Total wet storage = 400 cf per acre of contributing imp area, depth of permanent pool >4 ft [30] | Reinforced concrete | Off-line, ideal in urban areas with small lots and for retrofits [31] | No soil or terrain restrictions [32] |
| Hydro Dry Screen | Above ground and below grade storage and settling | Max Flow: 29-162 cfs, Treatment Flow: 11-80 cfs , 80% TSS removal: 1.8-16 cfs [33] | Five models: 4x8 ft to 12x20 ft (see Table 1) [34] | New construction or redevelopment sites, retrofit of storm drain lines, shallow installations with high groundwater or bedrock, installations requiring low headloss [35] | |||
| Suntree Nutrient Seprating Baffle Box (NSBB) | Above ground and below grade storage and settling | Maximum Treatment Flow Rate: 2-45 cfs [36] | 4 ft x 2 ft x 2.7 ft - 24 ft x 12 ft x 9 ft [37] | Online [38] | |||
| Manhole Baffle Box | Above ground and below grade storage and settling | 1-100 acres [39] | Typically 10-15 ft long x 6-8 ft high x 2 ft wider than pipe [40] | Concrete, fiberglass [41] | In-line or at the end of storm pipes, ideal for retrofitting existing pipes [42] | ||
| Environment 21 StormPro | Above ground and below grade storage and settling | 0.5-8.6 cfs. Max loading for all models = 10.8 gpm/sq ft [43]; [44] | 11 models. The 5 models in the StormPro V series range from 4 ft x 8 ft x 2.5+ ft to 10 ft x 20 ft x 5+ ft [45]; [46] | Baffle wall: precast concrete or other approved rigid materials, Bypass pipe: rigid plastic [47] | |||
| BaySeparator by BaySaver | Above ground and below grade storage and settling | 1.2-8 acres impervious area [48] | Treats maximum of 22 cfs [49] | 5 standard sizes: manhole diameter 48-120 inches, 6-8 ft deep [50] | Concrete, HDPE, polyethylene [51] | ||
| Sump Manhole with SAFL Baffle | Above ground and below grade storage and settling | <10 acres [52] | Horizontal flow must be at least 3x flow from above [53] | Can be installed in sump structures w/ diameters of 3-10 ft and depths >= 3 ft [54] | Stainless steel [55] | New or existing sump manhole [56] | |
| Deep sump catch basin | Above ground and below grade storage and settling | <0.25 acre impervious area | < 3 cfs [57] | Diameter of outlet pipe = D: diameter of catch basin = 4D, sump depth >= 4D, top of outlet pipe 1.5 D below bottom of inlet. Minimum sump depth = 4 ft. [58] | Off-line system. May not be used in place of oil/grit separator or sand filter in areas with potential to generate high concentrations of oil and grease such as high-use parking lots, gas stations, and vehicle storage areas [59] | ||
| Forebay/pre-settling | Above ground and below grade storage and settling | 10 acres minimum to wet pond, portion feeding into forebay depends on number of tributaries to pond [60] | ~0.2 cfs/acre drained [61] | Volume > 10% of water quality volume, depth = 3-6 ft, surface area = 10% of pond permanent pool surface area or 0.1% of drainage area, Tear shaped (inlet at narrow end) w/ avg length to width ratio = 3:1, side slope = 3:1 or flatter [62]; [63] | Bottom of forebay hardened using concrete, asphalt, or grouted riprap [64] | On-line, at each inlet contributing greater than 10% of the total design storm inflow to pond [65] | Underlying soils should be hydrologic group C or D, liner may be needed for A or B group soils. [66] |
| Pretreatment vegetated filter strip (VFS) | Filtration | < a few acres, max flow path 75-150 ft depending on perviousness, slope of drainage area <5% [67]; [68] | <1 ft/s, flow should be sheet flow and unconcentrated [69] | VFS width (parallel to sheet flow) = 25-100 ft depending on vegetation, slope and drainage area soil [70]; [71] | Soil, grass [72] | Residential lawns, parking lots, part of riparian buffer [73] | Hydrologic Soil Groups A-D permitted, table for corresponding slopes [74] |
| Filtration | Level-Spreader - Vegetative Filter Strip System (LS-VFS) | < a few acres [75] | <=10cfs [76] | LS width (parallel to sheet flow) = 10-100 ft, VFS width >= 30-50 ft [77] | Concrete, soil, grass [78] | Distance from surface waters: LS and VFS must be outside riparian buffer, LS must be outside stormwater setbacks [79] | VFS max slope = 8% [80] |
| Up-Flo Filter | Filtration | 0.66 acres impervious drainage area per filter module based on Nashville design storm [81] | 0.056 cfs per filter module (max number of modules 6-54) [82] | Round manhole: 4 ft diameter, 7.5 ft high Rectangular vaults: 6 ft x 8 ft x 6.5 ft to 15 ft x 13 ft x 6.5 ft | Roads, carparks, commercial properties, airports, offline and online treatment of existing storm drains [83] | ||
| Storm Clean | Filtration | Filtration flow rates (nominal/max)= 40/80 gpm, Strainer flow rate >= 100 gpm [84] | Filtration surface area (fabric elements) = 6.4 sq ft, Strainer surface area = 4.8 sq ft [85] | Stainless steel [86] | Can be fit into existing catch basin, curb inlet, drop inlet, or downspout [87] | ||
| Gravel filtration | Filtration | Same as inlet gravel bags are placed around | Varies by need. For example, one version available comes in 11x48, 11x96, and 19x28 inch bags. [88] | Bags are high quality woven polymer material with high UV rating, gravel [89] | In front of or around existing catch basin inlets [90] | ||
| Filtration berm | Filtration | 1 cfs per 8 linear ft [91] | Berm height = 12-18 inches high with 3:1 side slopes, every 100-300 feet depending on slope [92] | Washed, well-graded gravel/rock ¾ to 3 inches in size with <5% fines [93] | Right-of-ways, traffic areas, construction sites [94] | No restriction | |
| SiltSoxx R by Filtrexx | Filtration | Varies by application | Varies by application | Available in 5 in to 32 in diameter depending on application, up to 200 ft in length [95]; [96] | Filtrexx Media in Filtrexx Mesh [97] | Existing inlets, site perimeters, paved surfaces, compacted soils, exposed slopes [98] | Compacted or susceptible to erosion |
| StormExx R by Filtrexx | Filtration | Same as catch basin | 15-40 gpm [99] | 15-gallon storage, fits any existing storm drain [100] | Stainless steel or HDPE, EnviroSoxx filtering media cartridge [101] | Existing inlet | |
| SNOUT | Screening/Straining | Same as catch basin | Same as catch basin | Variety of sizes and shapes fit most rectangular and round manholes [102] | Existing manholes and sumped catch basins (sump depth must be >36 inches or 2.5 x outlet pipe diameter [103] | ||
| Eliminator | Screening/Straining | Same as catch basin | Up to 2 cfs if Elimo-Filter used [104] | 8, 10, 12, 15, and 18-inch sizes | High Density Polyethylene | Existing manholes and sumped catch basins | |
| Floatable boom | Buoyancy/Skimming | Float height = 2-8 inches, Skirt/curtain = 8-16 ft, Section length 25-100 ft [105] | Blocks of expanded polystyrene, PVC | Calm to medium current water bodies downstream of nearshore construction zones, dredging, demolition [106] | |||
| Hood | Buoyancy/Skimming | Same as catch basin |