Percolation Pit Design
Percolation Pit Design
(OP)
I am designing an on-site storm drain percolation pit and need some details of the infiltration layers to use on the bottom and slopes. Any recommendations or references?
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RE: Percolation Pit Design
Please see FAQ731-376 by VPL for tips on how to make the best use of Eng-Tips Fora.
RE: Percolation Pit Design
RE: Percolation Pit Design
Depending on the gravelly silty clay's (ML-CL) properties, you might be able to use that stratum as your sink. I did something like that on a site in the L.A. area for Roadway Express around 1990. It worked like a charm - but there was one difference: the soils at that site were silty fine sands.
I'd suggest hiring a pier rig to drill a 36 inch hole, and run falling head permeability tests (i.e. "perc tests") at various depths to evaluate the infiltration rate. Be sure the rig can reach to 60 feet - just in case.
Please see FAQ731-376 by VPL for tips on how to make the best use of Eng-Tips Fora.
RE: Percolation Pit Design
5 - 7 days is a long time. Our requirement generally limits it to 36 hours, partially to prevent health and safety problems such as mosquitoes breeding, children playing in contaminated stormwater, drownings, etc.
RE: Percolation Pit Design
Even tile disposal fields require a minimum of a geotechnical investigate and perc. tests before they can be signed off.
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