A sustainable drainage system (SuDs,  SuDS, SUDS   ) is designed to reduce the potential impact of new and existing developments with respect to surface water drainage discharges  . The term sustainable urban drainage system   is not the accepted name, the ‚Urban‘ reference has been removed to rural rural water management practices.  
Increasing urbanization has caused problems with increased flash flooding after sudden rain. As areas of vegetation are Replaced by concrete, asphalt , gold roofed structures, leading to impervious surfaces , the area ict Loses Ability to absorb rainwater. This rain is instead directed to surface water drainage systems, often overloading them and causing floods.
The idea behind SUDS is to try to replicate the drainage patterns of natural systems by using cost-effective solutions with low environmental impact to drain away dirty and Surface water run-off through collection, storage, and cleaning before Allowing it to be released slowly back into the environment, such as into water races. This is to counter the effects of flooding, pollution of the environment – with the resultant harm to wildlife – and contamination of groundwatersources used to provide drinking water. The paradigm of SuDS solutions should be that of a system that is easy to manage, and that it is attractive to use, and that it is environmentally and attractively attractive. Examples of this type of system are basins (shallow landscape depressions that are dry most of the time when it’s not raining), rain gardens (shallow landscape depressions with shrub or herbaceous planting), swales (shallow normally-dry, wide-based ditches) , filter drains (gravel filled trench drain), bioretention basins (shallow depressions with gravel and / or sand filtration layers), reed beds and other wetlands habitats that collect, store, and filter dirty water along with providing a habitat for wildlife.
Originally the term SUDS described the UK approach to sustainable urban drainage systems. These developments are not necessarily „urban“ areas, and thus the „urban“ part of SuDS is now generally dropped to reduce confusion. Other countries-have similar approaches in place using a different terminology Such As best practice management (BMP) and low-impact development in the United States,  and water-sensitive urban design in Australia.
SuDS use the following techniques:
- source control
- permeable paving such as pervious concrete
- storm water detention
- storm water infiltration
- evapo-transpiration (eg from a green roof )
A common misconception of SuDS is that they reduce flooding on the development site. In fact the SuDS is designed to reduce the impact that the surface water drainage system of one site has on other sites. For instance, sewer flooding is a problem in many places. Paving or building over land can result in flash flooding. This happens when it flows in the direction of its capacity and it overflows. The SuDS system aims to minimize or reduce discharges from the site, thus reducing the impact, the idea being that all development sites would be reduced. Unlike traditional urban stormwater drainage systems, SuDS can also help to enhance and enhance groundwater quality.
The first sustainable drainage system to use has full management control process Including source in the UK Was Oxford services designed by Robert Bray Associates, specialist SUDS consultants. 
- Detention basin
- Drainage system
- French drain
- Rain garden
- Resin-bound paving
- Retention basin
- Stream restoration
- Sustainable city
- Urban runoff
- Urban drainage
- ^ Jump up to:a b Sustainable Drainage System (SuDs) for Stormwater Management: A Technological and Policy Intervention to Combat Diffuse Pollution , Sharma, D., 2008
- Jump up^ „CIRIA guide to SUDS“ . Ciria.org . Retrieved 2014-01-21 .
- Jump up^ Scottish Government. Planning Services (2001). „Planning and Sustainable Urban Drainage Systems.“ Planning Advice Note 61. 2001-07-27.
- Jump up^ CIRIA SUDS Manual(Document reference: CIRIA C753), 2015
- Jump up^ Environmental investment may help local economy, 22 October 2002
- Jump up^ CIRIA Publication, ‚evolution’May 2010
- Jump up^ Susdrain- CIRIA’s Sustainable Drainage Website.
- Jump up^ US Environmental Protection Agency. Washington, DC (2006). „Fact Sheet: Low Impact Development and Other Green Design Strategies.“2006-06-01.
- Jump up^ CIRIAOxford Motorway Services Case Study