Difference between revisions of "Key Design and Plan Review Considerations"

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draw on LID I&M Guide section 4 content (see training presentation for ideas for images/photos) and include content on Inspection and Maintenance page under section title of the same name.  Add links to the new page to relevant BMP landing pages under “Design” section titles too.
draw on LID I&M Guide section 4 content (see training presentation for ideas for images/photos) and include content on Inspection and Maintenance page under section title of the same name.  Add links to the new page to relevant BMP landing pages under “Design” section titles too.
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==Overview==
Designing LID BMPs with ease of inspection and maintenance in mind is critical to the affordability of municipal stormwater infrastructure asset management programs and must be considered early on in the overall activity. Generally this occurs during the design and an early stage in the plan review and approval process. The following sections provide tips on tailoring the design of LID BMPs to help reduce the frequency of structural repairs and make inspection and maintenance tasks easier and cheaper to perform by either municipal staff or hired external consultants.
==Provide Runoff Pretreatment==
[[Pretreatment]] refers to techniques or devices used to retain coarse materials suspended in stormwater runoff, either through filtration or settling, before it enters the BMP rendering it inefficient over time. Proper pretreatment extends the operating phase of the BMP’s life cycle by reducing the rate of accumulation of coarse sediment, thus delaying the need for at times expensive structural repairs like unclogging filter beds, pipes and orifices. Common pretreatment devices include [[vegetated filter strips]], [[grass swales]], [[geotextile]]-lined inlet filters/liners, [[check dams]], [[forebays]], eavestrough screens or filters, [[Oil and grit separators]] (i.e., hydrodynamic separators) and manholes containing baffles, filters and sumps. One important consideration for pretreatment is that these devices require frequent (i.e., at minimal, annual) sediment and trash removal maintenance and should be easy to access by inspection personnel.

Revision as of 15:15, 21 June 2022

Fill from Section 4.0 of the 2016 Guide!!

draw on LID I&M Guide section 4 content (see training presentation for ideas for images/photos) and include content on Inspection and Maintenance page under section title of the same name. Add links to the new page to relevant BMP landing pages under “Design” section titles too.


Overview[edit]

Designing LID BMPs with ease of inspection and maintenance in mind is critical to the affordability of municipal stormwater infrastructure asset management programs and must be considered early on in the overall activity. Generally this occurs during the design and an early stage in the plan review and approval process. The following sections provide tips on tailoring the design of LID BMPs to help reduce the frequency of structural repairs and make inspection and maintenance tasks easier and cheaper to perform by either municipal staff or hired external consultants.

Provide Runoff Pretreatment[edit]

Pretreatment refers to techniques or devices used to retain coarse materials suspended in stormwater runoff, either through filtration or settling, before it enters the BMP rendering it inefficient over time. Proper pretreatment extends the operating phase of the BMP’s life cycle by reducing the rate of accumulation of coarse sediment, thus delaying the need for at times expensive structural repairs like unclogging filter beds, pipes and orifices. Common pretreatment devices include vegetated filter strips, grass swales, geotextile-lined inlet filters/liners, check dams, forebays, eavestrough screens or filters, Oil and grit separators (i.e., hydrodynamic separators) and manholes containing baffles, filters and sumps. One important consideration for pretreatment is that these devices require frequent (i.e., at minimal, annual) sediment and trash removal maintenance and should be easy to access by inspection personnel.