Sustainable Urban Drainage Systems (SUDS) are a sequence of water management practices and facilities designed to drain surface water in a manner that will provide a more sustainable approach than the conventional practice of routing run-off through a pipe to a watercourse.

The aim of SUDS is to mimic the natural surface water drainage process. For new developments this can be achieved through the inclusion of features such as soakaways, infiltration basins, swales, permeable pavements, filter strips and balancing ponds.

New developments often replace absorbent land with significant areas (buildings, roads, driveways, etc.) which are impermeable to rainwater and which, during times of high rainfall, cause runoff leading to flooding.

The many devastating floods of recent years, most notably in the winter of 2015-2016, exacerbated in many cases by inadequate storm water controls, have placed renewed emphasis on the need for adequate and sustainable storm water management.

The government’s National Planing Policy Framework (NPPF) requires that planning applications for new developments using SUDS are given priority. Local authorities are recognising the benefits of SuDS and requirements are constantly evolving, and becoming more stringent.  Cole Easdon can interpret planning requirements to maximise the benefits of SuDS for a site.

The Benefits

A professional Sustainable Urban Drainage System prepared by Cole Easdon Consultants will:

  • Provide developers with the SUDS plan needed by Local Planning Authorities to prioritise proposed developments
  • Enable the sustainable management of surface water drainage
  • Reduce the risk of flooding to the development and the surrounding area
  • Improve the quality of downstream water
  • Incorporate features, such as permanent ponds, which can improve local amenity and provide an environment to support biodiversity

How We Can Help

As experts in water management we provide some or all of the following services to help our clients deliver effective Sustainable Urban Drainage Systems (SUDS):

  • The provision of SUDS advice and design
  • Computer modelling of drainage networks including sewers and watercourses using WINDES software
  • Soil infiltration testing to determine soakaway drainage potential
  • Technical assistance to understand surface water flooding (e.g. drainage exceedance modelling to determine flood volumes, velocities and mapping of flood flow routes)
  • Preparation of NPPF compliant sustainable drainage strategies

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