Skeletank Infiltration Techniques

Skeletank Infiltration Techniques

Overview

Current legislation and guidance is aimed at encouraging developers to use infiltration as their preferred method to dispose of surface water runoff from new housing developments. Skeletank products and design techniques have been developed to allow you to utilise infiltration more often and more effectively than by using traditional methods. Our systems can be used in conjunction with both pervious and impervious surfaces and are also ideal for use in landscaped areas.

 

Runoff destinations

Extract from DEFRA National Standards for Sustainable Drainage

SuDS Surface runoff not collected for use must be discharged to one or more of the following listed in order of priority:

  1. discharge into the ground (infiltration); or where not reasonably practicable,
  2. discharge to a surface water body; or where not reasonably practicable,
  3. discharge to a surface water sewer, highway drain or another drainage system; or where not reasonably practicable,
  4. discharge to a combined sewer.

 

Is your site suitable for infiltration?

A thorough assessment should be made to ascertain whether your site is suitable for the use of infiltration to manage surface water run-off. Permeability testing is only one element of this assessment. To download a summary of the current CIRIA recommendations and a useful checklist, please click the links below:

 

Using SuDS close to buildings

Typically, new housing developments have restrictions on the space available to install surface water drainage systems. When using infiltration, this can conflict with The Building Regulation’s requirement that infiltration devices should not be built, ‘within 5m of a building or road’ (Building Regulations 2000, Section H3, Rainwater Drainage, Clause 3.25a). However, the guidance notes within Section H3 state that, ‘In the Secretary of State’s view the requirements of H3 will be met if rainwater soaking into the ground is distributed sufficiently so that it does not damage the foundations of the proposed building or any adjacent structure’ (Building Regulations2000, Section H3, Rainwater Drainage, Guidance).

Some techniques, such as pervious pavements and rain gardens, have already received widespread acceptance for use in close proximity to buildings (although ground conditions may preclude this and each site should be investigated thoroughly to ensure the suitability of ground conditions for the use of pervious pavements and rain gardens in this manner).

 

Click here to view a fact sheet which explores this issue

 

Skeletank modular products and design techniques also allow for much more efficient diffusion of rainwater runoff than traditional methods and have been accepted for use within 5m of building foundations by Building Control.

Please note that ground conditions vary from site to site and it may be that it is not sensible to use infiltration devices of any sort near to building foundations. Please check with our technical team for site specific design assistance.

Skeletank Solutions for Infiltration (choose one of the links below)

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Pervious

Impervious

Landscape