Difference between revisions of "Choker layer"
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Jenny Hill (talk | contribs) (Created page with "<poem> A choking layer of ≥ 100 mm is the recommended method to prevent migration of finer filter media into an underlying reservoir of Reservoir gravel|coarse aggrega...") |
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In [[bioretention]] systems a choking layer of ≥ 100 mm is the recommended method to prevent migration of finer [[filter media]] into an underlying reservoir of [[Reservoir gravel|coarse aggregate]]. | |||
Suitable materials include: | Suitable materials include: | ||
;High performance bedding (HPB) | |||
:Clean, angular aggregate screened to between 6 - 10 mm. Widely available and designed specifically for drainage applications. Free from fines by definition. | |||
;HL 6 | |||
:Is a clean, angular aggregate screened between 10 - 20 mm. Free from fines by definition. | |||
;Pea Gravel | ;Pea Gravel | ||
: | :Rounded natural aggregate, screened between 5 - 15 mm, and washed free from fines. | ||
In most scenarios, a [[geotextile]] layer is unnecessary and have been associated with rapid decline and clogging in some circumstances. | |||
[[category: materials]] | [[category: materials]] | ||
Revision as of 20:07, 5 March 2018
In bioretention systems a choking layer of ≥ 100 mm is the recommended method to prevent migration of finer filter media into an underlying reservoir of coarse aggregate. Suitable materials include:
- High performance bedding (HPB)
- Clean, angular aggregate screened to between 6 - 10 mm. Widely available and designed specifically for drainage applications. Free from fines by definition.
- HL 6
- Is a clean, angular aggregate screened between 10 - 20 mm. Free from fines by definition.
- Pea Gravel
- Rounded natural aggregate, screened between 5 - 15 mm, and washed free from fines.
In most scenarios, a geotextile layer is unnecessary and have been associated with rapid decline and clogging in some circumstances.