Permeability testing is required to allow design of soakaway drainage systems for both clean water and grey water. EMS offer a range of tests including:

  • Full scale soakaway testing to BRE365:2015.
  • NHBC percolation test for soakaways.
  • Percolation test in accordance with Building Regulations Approved Document H (normally for drainage fields accepting grey water from septic tanks).
  • Falling or rising head permeability tests in boreholes or borehole standpipes

EMS will be happy to recommend the most suitable test for your site, based on the ground conditions, the type of soakaway drainage anticipated and the available access.

Sustainable Drainage Design (SUDS)

In considering planning permission, local authorities will often require the developer to demonstrate that all sustainable urban drainage systems (SUDS) have been considered before granting permission. This can readily be achieved by undertaking soakaway infiltration tests to BRE 365 in shallow trial pits. The trial pits can often serve a dual purpose to provide foundation design information for low rise housing developments.

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