Difference between revisions of "Pretreatment"
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!OGS Baffles | !OGS Baffles | ||
|Baffles slow flow, encouraging larger, heavier particles to drop out of the water column. A skimmer may also trap floating debris, oils and grease.||-||[http://upstreamtechnologies.us/products/safl.shtml SAFL baffle] | |Baffles slow flow, encouraging larger, heavier particles to drop out of the water column. A skimmer may also trap floating debris, oils and grease.||-||[http://upstreamtechnologies.us/products/safl.shtml SAFL baffle] | ||
|- | |||
!Hydrodynamic OGS | |||
|The shape causes rapidly flowing water to form a vortex which forces the larger, heavier particles are outwards and downwards into a lower chamber. Floating debris, oils and grease are trapped behind a baffle or in small tank area, towards the top of the main vortex chamber||[http://www.conteches.com/Products/Stormwater-Management/Treatment/CDS.aspx CDS]<br>[https://www.hydro-int.com/en/products/downstream-defender Downstream defender]<br>[http://nextstorm.ca/sdd/ SDD] | |||
||[http://www.imbriumsystems.com/stormwater-treatment-solutions/stormceptor-systems Stormceptor] | |||
|- | |||
!Cartridge filters | |||
|Uses advanced membrane technology adopted from water treatment plants.||-||[http://www.imbriumsystems.com/stormwater-treatment-solutions/jellyfish-filter Jellyfish filter] | |||
|- | |||
!Catchbasin inserts | |||
|Great for improving water quality in retrofit situations||[http://www.cbshield.com/ CB Shield]||[http://upstreamtechnologies.us/products/snout.shtml Snout] | |||
|} | |} | ||
==External resources== | |||
*[https://www.cmhc-schl.gc.ca/en/inpr/su/waho/waho_015.cfm CMHC OGS Effectiveness Study] | |||
This article is particularly heavy on proprietary systems and information. Please inform us of any omissions or broken links using the box below: | This article is particularly heavy on proprietary systems and information. Please inform us of any omissions or broken links using the box below: | ||
[[category: Pretreatment]] | [[category: Pretreatment]] |
Revision as of 02:12, 15 August 2017
Overland sheet flow[edit]
The following pretreatements are recommended where sheet flow is being directed to a BMP (typically a bioretention cell) from the edge of an impermeable surface such as an asphalt parking lot or a paved plaza:
A gravel diaphragm typically requires less setback between the catchment and the BMP. Where space permits, these two designs can be used in combination to even greater effect!
Concentrated overland flow[edit]
Where a curb cut, a disconnected downspout or a swale directs surface water to a point, increasing the flow rate, one or more of the following pretreatments should be considered:
- Forebays (well suited for bioretention cells)
- Sand filters (well suited for underground infiltration)
- Screens and racks
Concentrated underground flow[edit]
This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the Environmental Technology Verification (ETV) program.
Type | Description | ETV products | Other products (not verified) |
---|---|---|---|
OGS Baffles | Baffles slow flow, encouraging larger, heavier particles to drop out of the water column. A skimmer may also trap floating debris, oils and grease. | - | SAFL baffle |
Hydrodynamic OGS | The shape causes rapidly flowing water to form a vortex which forces the larger, heavier particles are outwards and downwards into a lower chamber. Floating debris, oils and grease are trapped behind a baffle or in small tank area, towards the top of the main vortex chamber | CDS Downstream defender SDD |
Stormceptor |
Cartridge filters | Uses advanced membrane technology adopted from water treatment plants. | - | Jellyfish filter |
Catchbasin inserts | Great for improving water quality in retrofit situations | CB Shield | Snout |
External resources[edit]
This article is particularly heavy on proprietary systems and information. Please inform us of any omissions or broken links using the box below: