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Pretreatment - Screening and straining devices, including forebays

[[File:General information page image.png|left|100px|alt=image]]

{{alert|''Reference to any specific commercial product, process, or service by trade name, trademark, service mark, manufacturer, or otherwise does not constitute or imply endorsement, recommendation, or favoring by the Minnesota Pollution Control Agency. ''|alert-info}}

[[File:Figure for screening straining practices.jpg|300px|thumb|alt=image of swale check dams|<font size=3>Photograph of an example of check dams, which are designed to reduce velocity and thus enhance settling of sediment behind the dams (image courtesy: Massachusetts Clean Water Toolkit, Massachusetts DEP).</font size>]]

Screening and straining devices trap trash and coarse debris using smaller apertures such as grates or screens. While many pretreatment devices utilize screening and straining in tandem with their main treatment process, the examples in this category are constrained to those that primarily remove larger particles and sediment by screening or straining. These devices are often visible from ground level as they generally sit above grade or slightly below grade before or just following inlets in order to protect the downstream drainage system/BMP from clogging. This table contains both proprietary and nonproprietary devices, with the proprietary systems often applying the same or similar mechanisms to the nonproprietary systems but with convenient and sometimes easier construction or ease of maintenance.

==System design==
Screening and straining devices can often be installed in parallel to accommodate larger drainage areas, but in general, each unit is intended for a small drainage area (< 1acre). 

==System and component sizing==
Most important for the sizing is the anticipated frequency of operation and maintenance as well as the considerations of how well the device provides protection of downstream BMPs and receiving waters.

==Links to tables with information on screening and straining devices==
Below are links to several tables containing information on screening and straining devices. To see all tables on a single page, [[Screening and straining devices tables combined|link here]].
*[[Screening and straining devices - general information]]
*[[Screening and straining devices - system design information]]
*[[Screening and straining devices - system and component sizing]]
*[[Screening and straining devices - installation and maintenance recommendations]]

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==Related pages==
*[https://igeowater.com/mpca/#/intro Pretreatment selection tool]
*[[Overview and methods of pretreatment]]
*Overviews for different types of pretreatment practices
**[[Overview for pretreatment settling devices]]
**[[Overview for pretreatment screens]]
**[[Overview for pretreatment vegetated filter strips]]
*Information for specific types of pretreatment practices
**[[Design, construction, operation and maintenance specifications for pretreatment vegetated filter strips]]
** [[Pretreatment - Hydrodynamic separation devices]]
**[[Pretreatment - Screening and straining devices, including forebays]]
**[[Pretreatment - Above ground and below grade storage and settling devices]]
**[[Pretreatment - Filtration devices and practices]]
**[[Pretreatment - Other pretreatment water quality devices and practices]]

:To see the above pages as a single page, [[Pretreatment practices combined single page|link here]]

[[Pretreatment sizing for basins and filters strips]]

[[Guidance for managing sediment and wastes collected by pretreatment practices]]

'''Tables'''
*[[Pretreatment tables]] - link to tabled information for pretreatment practices
*[https://stormwater.pca.state.mn.us/index.php?title=Hydrodynamic_separator_tables_combined Hydrodynamic separator tables]
*[https://stormwater.pca.state.mn.us/index.php?title=Screening_and_straining_devices_tables_combined Screening and straining devices tables]
*[https://stormwater.pca.state.mn.us/index.php?title=Above_ground_and_below_grade_storage_and_settling_tables_combined Above ground and below grade storage and settling tables]
*[https://stormwater.pca.state.mn.us/index.php?title=Filtration_tables_combined Filtration tables]
*[https://stormwater.pca.state.mn.us/index.php?title=Other_water_quality_devices_tables_combined Other water quality devices tables]

'''Other information and links'''
*[[Pretreatment - Additional considerations]]
*[[Case studies for pretreatment]]
*[[References for pretreatment]]
*[[Links for pretreatment]]
*[[Definitions for pretreatment]]
*[[Supporting material for pretreatment]]
*[[Photo gallery for pretreatment]]

[[Category:Level 3 - Best management practices/Pretreatment practices‏‎/Screening and straining devices]]
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