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Sustainable Drainage Systems (SuDS)

Updated 15 September 2015

As the Lead Local Flood Authority (LLFA) Hampshire County council is a statutory consultee for Surface Water Drainage on applications for major development. This new role started on 15 April 2015 and requires Hampshire County Council to be consulted on these developments when a planning application is received by the Local Planning Authority.

As a statutory consultee we are not responsible for determining planning applications or commenting on issues that do not fall within our remit. We are not at present offering pre-application advice as a standard service and requests will be determined on a case by case basis.

“Major development” means development involving any one or more of the following:

  1. the winning and working of minerals or the use of land for mineral-working deposits
  2. waste development
  3. residential development: 10 dwellings or more, or residential development with a site area of 0.5 hectares or more where the number of dwellings is not yet known.
  4. non-residential development: provision of a building or buildings where the total floorspace to be created is 1000 square metres or more, or where the floor area is not yet known, a site area of 1 hectare or more.

Find advice on what is needed for your planning application and complete our online form if you require more information on a site regarding flood risk (note there may be a charge for this information)

We also now offer pre-application advice in relation to our surface water drainage please see our information on the charges for this advice Surface water pre-application charges  Download Adobe Reader to view this PDF 3MB and complete our online form if you require this service.

What are SuDS?

Sustainable Drainage Systems (SuDS) are designed to mimic the natural drainage of surface water, typically managing rainfall close to where it falls. Surface water flows are then slowed down and discharged at a controlled rate before it enters a watercourse. They can also store water, allow it to soak into the ground or enable evaporation from surface water. SuDS offer a wide range of benefits, as they can:

SuDS features include; filter strips and swales, filter drains and permeable surfaces, infiltration devices and basins and ponds.

For further information on SuDS, please see:


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For further information on Sustainable Drainage Systems in Hampshire:


Sustainable drainage

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