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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 52:
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Line 84: − *Nonproprietary concrete inlet sump+ − + − |-+ − !Overland flow sumps − |Collects and settles debris as overland flow passes through sump to treatment device.|| − | − − *Catch basin or other pre-fabricated inlet structure sump − *Nonproprietary concrete inlet sump
→Concentrated underground flow
* Catch basin or other pre-fabricated inlet structure sump;
* Catch basin or other pre-fabricated inlet structure sump;
* [[Level spreader]];
* [[Level spreader]];
*[[Pretreatment features| Forebays]] (well suited for bioretention cells);
*[[Pretreatment features| Forebays]] (well suited for bioretention cells). See [[Pretreatment features]] for guidance on sizing.;
* [[Stone]] and [[geotextile]] filter: A shallow excavation on the filter media bed surface at the inlet, lined with geotextile and rip rap or decorative stone cover; and,
* [[Stone]] and [[geotextile]] filter: A shallow excavation on the filter media bed surface at the inlet, lined with geotextile and rip rap or decorative stone cover; and,
*[[Sand filters]] (well suited for underground [[infiltration]]);
*[[Sand filters]] (well suited for underground [[infiltration]]);
*Concrete sump pretreatment device. [https://acfenvironmental.com/products/stormwater-management/filtration/rain-guardian/ Rain Guardian] is one example of a proprietary sump device.
*Concrete sump pretreatment device. [https://acfenvironmental.com/products/stormwater-management/filtration/rain-guardian/ Rain Guardian] is one example of a proprietary sump device.
==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)] 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"
!style="width: 10%;"|Type
!style="width: 10%;"|Type
!style="width: 40%;"|Description
!style="width: 40%;"|Description
!style="width: 25%;"|ETV products
!style="width: 25%;"|ETV Canada verified products
!style="width: 25%;"|Other products (not verified)
!style="width: 25%;"|Other products (not verified)
|-
!Overland flow sumps
|Collects and settles debris as overland flow passes through sump to treatment practice.||
|
*Catch basin or other non-proprietary pre-fabricated inlet structure sump
*[https://www.rainguardian.biz/ Rain Guardian]
|-
|-
!Catch basin inserts
!Catch basin inserts
*[https://www.enviropod.com/products/littatrap Littatrap]
*[https://www.enviropod.com/products/littatrap Littatrap]
*[http://www.bmpinc.com/ Snout]
*[http://www.bmpinc.com/ Snout]
|-
|-
!Oil and grit (hydrodynamic) separators
!Oil and grit (hydrodynamic) separators
*[https://www.hydro-int.com/en/products/first-defense First Defense]
*[https://www.hydro-int.com/en/products/first-defense First Defense]
*[http://www.hydroworks.com/hydrostorm.html Hydrostorm]
*[http://www.hydroworks.com/hydrostorm.html Hydrostorm]
*[http://nextstorm.ca/sdd/ SDD]
*[https://biocleanenvironmental.com/sciclone-separator SCICLONE HDS]
*[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.||
|
|
*[http://upstreamtechnologies.us/products/safl.shtml SAFL Baffle]
|-
|-
!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.
|
|
|
|
*[http://www.imbriumsystems.com/stormwater-treatment-solutions/filterra Filterra]
*[http://www.imbriumsystems.com/stormwater-treatment-solutions/filterra Filterra]
*[https://www.adspipe.com/water-management-solutions/water-quality/filters/bayfilter-stormwater-treatment-system BayFilter]
*[https://baysaver.com/products/bayfilter/ BayFilter]
*[https://www.conteches.com/stormwater-management/treatment/stormwater-management-stormfilter StormFilter]
*[https://www.conteches.com/stormwater-management/treatment/stormwater-management-stormfilter StormFilter]
*[https://hydro-int.com/en/products/flo-filter#dismiss-notification Up-Flo Filter]
|
|
*[https://www.imbriumsystems.com/stormwater-treatment-solutions/sorbtive-media Sorbtive Media]
*[http://www.rainguardian.biz/project-planing/chamber-selection Rain Guardian]
|-
|-
|}
|}