1. Sustainable Urban Drainage Systems by Robert Mackey Adapted from a presentation by Dr David Skidmore

2. Impervious surfaces increase peak water run-off

3. Sustainable Drainage Systems need to: - Hold water to stop flash floods Allow water to soak away gradually Hold back as many pollutants as possible from entering water courses Be suitable in safety and aesthetics for their residential or industrial development

4. SUDS Water run-off is treated through: 1.Good housekeeping 2.Source controls 3.Site controls 4.Regional controls

5. SUDS

6. Good Housekeeping Aims to keep pollutants away from run-off through Management of the drainage system Monitoring Education Care of disposal including oil and litter

7. Source controls Controlling run-off at or near its source For example: - Water butts Grass roofs Water meters

9. Site controls These can work over larger sites Normally 2 - 5 hectares Swales Gravel car parks Infiltration Filter drains Detention basins

16. Regional Controls Collect water from several sub- catchments Usually with area more than 10 hectares Large detention basins Ponds wetlands

19. SUDS can offer Improved water quality A range of wildlife habitats Aesthetic value Recreational value