SuDS illustrations Steven Wade
SuDS illustrations
Steven Wade
Sustainable Drainage Systems (SUDS)
• Sustainable drainage is a an approach, which unlike conventional drainage:
- Replicate, as closely as possible, the natural flow pattern of a urban development site- Minimise the impact the site on flooding and pollution of rivers, streams and other water bodies- Manage water from
developments in a sustainable manner- Provide amenity/biodiversity
benefits
© All images in this presentation are copyright of the Environment Agency except where stated
SUDS Triangle
Rapidremoval
ofwater
MinimiseFlood Risk
Control Water Pollution
Urban amenity
&biodiversity
Traditional Urban drainage Sustainable Urban drainage
© SWIMMER
The effects of development on Water Quantity
An undeveloped catchment
40%Evapotranspiratio
n
25% Deep infiltration
25%Shallow
infiltration
10% Runoff
Ponding / storage
© All images in this presentation are copyright of the Environment Agency except where stated
The effects of development on Water quantity
A developed catchment with conventional drainage
60% Runoff
10% Shallow infiltration
5% Deep infiltration
20%Evapotranspiration
© All images in this presentation are copyright of the Environment Agency except where stated
How do they operate? The SUDS Management Train
Source Control
Site Controls
Regional Controls
Watercourse
Soakaway / InfiltrationSwalesFilter drains / Filter stripsPorous/permeable surfaceBio-retention areas
Storage/attenuationDetention BasinsExtended DetentionInfiltration Basins
SUDS Technique
Retention PondsWetlandsBasins
Treatment Level
© All images in this presentation are copyright of the Environment Agency except where stated
The management train
© All images in this presentation are copyright of the Environment Agency except where stated
SUDS Sustainable Drainage Systems
Mitigate the adverse effects of urban stormwater runoff on the environment Reduce runoff rates Encourage groundwater recharge Reduce pollutant concentrations Buffer accidental spills from road drainage Reduce discharges to rivers or combined sewer systems Enhance amenity and provide wildlife habitats
SUDS components & key issues
Management train Sediment control System maintenance Open public space
SUDS ManualCIRIA C697
660 pages
Design criteria
Design criteria
Climate change allowances
Elvetham Heath
Scotland – mini swales
Drainage pipes underneath pick up runoff when it overflows down the grating for big events.
M40
Scotland - roundabout
Questions