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Sustainable Urban Drainage Systems - SuDS


Sustainable Urban Drainage Systems

SuDS: CPSA Proprietary Sustainable Urban Drainage Systems and Components

The use of sustainable urban drainage systems (SuDS) best management practices should be an integral part of any development’s surface water management strategy. This should provide a basis for replicating the response of a catchment and its surfaces by mimicking, to some extent, the behaviour of surface water on the developed site as if it had remained undeveloped.

Principles of Sustainable Urban Drainage Systems

  • Controlling surface water quantity (reducing off-site flow rates).
  • Improving surface water quality.
  • Providing added amenity value to the development.

The successful implementation of a SuDS scheme should consider a combination of natural and proprietary techniques, complemented by traditional drainage methods, where appropriate. It is essential that planners, designers, installers and operators of SuDS drainage systems take into account the importance of whole life maintenance and the use of suitable components that deliver authentic sustainable drainage performance and longevity.

SuDS Management Train

The Sustainable Urban Drainage Systems philosophy is underpinned by the water “Management Train”. The Management Train applies SuDS Drainage techniques in series and is based on:

  • Prevention; good housekeeping measures within the development.
  • Source control; runoff managed as close as possible to where it originates as rain.
  • Sub-catchments; division into small areas with different drainage characteristics and land use.
    • Site Control; dealing with runoff within or local to the development.
    • Regional Control; e.g. SuDS Drainage features within amenity space before final outfall.

The Management Train can be divided into the following processes:

  • Collection
  • Treatment
  • Re-use
  • Infiltration
  • Attenuation
  • Conveyance

Precast Concrete Sustainable Urban Drainage Systems

CPSA members offer a wide variety of proprietary SuDS components and systems suitable for use within a sustainable drainage system. These are listed in the table below indicating their functions within the Management Train. For specific product information, please consult our members.

SuDS Component
(click on images below to enlarge)

   
suds Circular Pipe Circular Pipe       Rigid pipeline system with flexible joints for conveyance of stormwater and storage / attenuation, available with optional dry weather flow channel and side entry manhole access. Perforated version enables stormwater to percolate into the ground.
suds Elliptical Pipe Elliptical Pipe         Elliptical pipeline system for conveyance of stormwater and storage / attenuation with minimal cover requirement, available with dry weather flow channel and side or top entry manholes.
suds Ovoid Pipe Ovoid Pipe         "Egg-shaped" pipeline system with integral dry flow channel. Higher velocity at low flow depths compared to circular pipe providing reduced risk of siltation.
suds Flat Pack Tank Flat Pack Tank           Modular attenuation tank system using precast panels.
Manhole Manhole         Off-site, watertight solution pre-benched and configured to required inlet/outlet orientation.
Soakaway Soakaway       Perforated chamber which may be open void (providing storage) or contain filter medium (providing treatment) to facilitate percolation of stormwater into the ground.
Flow Control Chamber Flow Control Chamber         Off-site solution with pre-installed flow control device such as penstock, non-return valve, weir wall, orifice plate, vortex flow regulator.
Road Gully Road Gully         Designed to receive storm water runoff from paved surfaces and first-line gravity separation of silt.
Filter Gully Filter Gully         Gully pre-fitted with filter for removal of oils and silt.
Hydrodynamic Vortex Separator Hydrodynamic Vortex Separator         Chamber for silt capture, litter and some oils.
Treatment Chamber Treatment Chamber           A variety of pre-configured chambers for removal of foreign objects and pollutants such as litter, oil, grease, silt & heavy metals.
Catch Pit Catch Pit           For the gravity separation of debris and silt to prevent it passing downstream.
Filter Catch Pit Filter Catch Pit           Catch pit pre-fitted with filter for removal of oils and silt.
Headwall Headwall           Inlets and Outlets, available with flap valves and grills, connecting swales, ponds, detention basins, etc to underground pipes.
Cascade Uinit Cascade Uinit           To protect embankments from erosion.
High Capacity Slot Drain High Capacity Slot Drain         Integrated gasket joint and excellent flow characteristics for surface run off and below ground applications.
Perforated Drainage Trough Perforated Drainage Trough       For shallow and deep channel applications.
Box Culvert Box Culvert         Range of sizes. Available with optional dry weather flow channel.
Rainwater Harvesting Tank Rainwater Harvesting Tank         Domestic and commercial rainwater harvesting systems.
Rainwater Filter Chamber Rainwater Filter Chamber           Rainwater harvesting pre-tank for leaf and grit removal.
Grey Water Recycling Tank Grey Water Recycling Tank       Domestic and commercial grey water recycling systems.

To find out more about Sustainable Urban Drainage Systems, Contact CPSA today, Or use the references below

References

Information sources to help plan, design and implement sustainable drainage.

  1. The community for sustainable drainage www.susdrain.org
  2. CIRIA. The SuDS Manual C753. | www.ciria.org
  3. Local Authority SuDS Officers Organisation (LASOO). How-to guidance on SuDS standards www.lasoo.org.uk/non-statutory-technical-standards-for-sustainable-drainage
  4. CIRIA. Site Handbook for the Construction of SuDS C698 | www.ciria.org
  5. BS 8582:2013 Code of practice for surface water management for development sites
  6. CIRIA. Designing for Exceedance in Urban Drainage Good Practice C635 | www.ciria.org
  7. CIRIA. Sustainable Drainage Systems. Hydraulic, Structural and Water Quality Advice C609 | www.ciria.org
  8. CIRIA. Infiltration Drainage – Manual of Good Practice R156 | www.ciria.org
  9. CIRIA. Control of Pollution from Highway Drainage Discharge R142 | www.ciria.org
  10. British Hydrological Society. Sources of Hydrological Data | http://www.hydrology.org.uk/Data_sources.php
  11. WRc. Sewers for Adoption (7th Edition) | www.wrcplc.co.uk
  12. Local Government Association. Flownet Knowledge Hub. A group for all those interested or involved in flood risk and water management | https://knowledgehub.local.gov.uk/group/flownet
  13. National Standards for sustainable drainage systems. Designing, constructing, operating and maintaining drainage for surface runoff. www.defra.gov.uk
  14. For information on SuDS legislation, questions on government policy and to register to receive updates email suds@defra.gsi.gov.uk