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Line 50: − |- − !Manhole 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] Line 59:
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→Concentrated underground flow
==Concentrated underground flow==
==Concentrated underground flow==
This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV) Canada] program.
This type of pretreatment is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV) Canada] program. Pretreatment devices suited to concentrated underground flow, or pipe flow include the following:
* Oil and grit (hydrodynamic) separators
* Manhole baffles
* Isolated chamber row filters
* Membrane filters
* Media filters
Membrane and media filters are more commonly used as "stand alone" water quality treatment practices when space for surface practices is not available, but may also be used downstream of LID facilities or treatment trains to enhance removal of sediment and other targeted pollutants (e.g., nutrients, metals) where warranted by receiving water sensitivity.
<br>
{|class="wikitable"
{|class="wikitable"
|Collects and settles debris as overland flow passes through sump to treatment practice.||
|Collects and settles debris as overland flow passes through sump to treatment practice.||
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*Catch basin or proprietary pre-fabricated inlet structure sump
*Catch basin or other non-proprietary pre-fabricated inlet structure sump
*[https://www.rainguardian.biz/ Rain Guardian]
*[https://www.rainguardian.biz/ Rain Guardian]
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|-
*[https://www.enviropod.com/products/littatrap Littatrap]
*[https://www.enviropod.com/products/littatrap Littatrap]
*[http://www.bmpinc.com/ Snout]
*[http://www.bmpinc.com/ Snout]
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|-
!Oil and grit (hydrodynamic) separators
!Oil and grit (hydrodynamic) separators
*[http://nextstorm.ca/en/oil-grit-separator-sdd/ SDD]
*[http://nextstorm.ca/en/oil-grit-separator-sdd/ SDD]
*[http://www.imbriumsystems.com/stormwater-treatment-solutions/stormceptor-ef Stormceptor EF]
*[http://www.imbriumsystems.com/stormwater-treatment-solutions/stormceptor-ef Stormceptor EF]
|-
!Manhole 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.||
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*[http://upstreamtechnologies.us/products/safl.shtml SAFL Baffle]
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!Isolated chamber row filter
!Isolated chamber row filters
|Separate rows at inlets, not connected by pipes to the other chambers, that isolate the bulk of sediment and associated pollutants and designed for ease of access by jet flushing cleaning equipment.
|Separate rows at inlets, not connected by pipes to the other chambers, that isolate the bulk of sediment and associated pollutants and designed for ease of access by jet flushing cleaning equipment.
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