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Stormwater BMP Manual: Accounting for Infiltration - slug conversion

Stormwater BMP Manual: Accounting for Infiltration-slug conversion

Stormwater BMP Manual: Accounting for
Workgroup Update
New Jersey Department of Environmental Protection
Division of Water Quality
January 10, 2018
June 2017 Stakeholdering
The Department has received feedback from some stormwater
designers and practitioners asserting this provision results in
stormwater basins that are designed and constructed larger than
necessary to adequately account for stormwater quantity
control. Conversely, other practitioners have expressed that not
accounting for potential infiltration provides a necessary margin of
safety to protect life and property from flooding and ensures the water
quantity design and performance standard to reduce the post
construction flow set forth in the rule is met.
June 2017 Stakeholdering
? Soil Permeability Testing - reliance on a limited number of soil test pits
and/or improper implementation of testing protocols may not provide
accurate soil permeability information
? Construction Methods - soil compaction during construction may decrease
soil permeability and infiltration rates
? Maintenance - improper maintenance that decreases soil permeability,
such as insufficient removal of accumulated sediment and overgrown
vegetation may decrease actual infiltration rates
? Groundwater Mounding - a reduction in permeability rate may occur
when groundwater mounding is present
? Soil Temperature-soil permeability may decrease when the ground is
partially or fully frozen and impact the infiltration rate.

What does 1 slug equal?The pounds-force unit number 32.17 lbf converts to 1 slug, one slug. It is the EQUAL force - Imperial value of 1 slug but in the pounds-force force unit alternative. Convert force of slug (slug) and pounds-force (lbf) units in reverse from pounds-force into slugs. First unit: slug (slug) is used for measuring force - Imperial.