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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Revision as of 22:18, 22 November 2017
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:
- Pea Gravel
Pea gravel or crushed stone screened between 5 - 15 mm, and washed, free from fines.
- High performance bedding (HPB)