SISTEC Presentation July 3 2002

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GREEN TECHNOLOGY FOR BUSINESSES IN TOURISM 12th
March 2008
Sustainable Urban Drainage Systems
Professor Chris Jefferies, University of Abertay
Dundee
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Contents

• What are SUDS for?
• What are SUDS?
• How do they work?
• How do they affect the National Park?
• Scottish Water
• Planning Authority

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SUDS account for peoples behaviour
1. Kevin the dog groomer
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SUDS account for peoples behaviour
2. John the wheelie bin cleaner
This is now a regulated activity
Headline in The Scotsman - New business start
up
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What are SUDS for?
Quantity
Quality
The urban drainage triangle - balancing the
impact of urban drainage
Amenity
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What are SUDS for?

• To control surface water from a development.
• To make sure the extra flow does not affect
  others or burns/ rivers/ lochs this is
  principally to control flood hazard.
• To make sure any accidental pollution does not
  pollute burns/ rivers/ lochs.
• To assist in maintaining the water balance.

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The Stormwater Treatment Train
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The Stormwater Treatment Train is the core
concept in the development of SUD systems
and finally to regional controls. Discharge to
a watercourse or Groundwater may be from any
stage.
The treatment train starts with prevention or
good housekeeping for individual premises...
...it then progresses through local source
controls...
...to larger downstream site controls..
Good Housekeeping
Discharge to receiving water
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Key Criteria for SUDS

• The size should be appropriate to the size of
  site.
• The levels of the treatment train should match
  the potential risk.
• Should be capable of being maintained.
• Should be maintained.

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Roadside Filter Drains
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Permeable Paving for Car Parks
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Detention Basins
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Roadside Swales
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Roadside Swales
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Ponds
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How do SUDS work?

• They store the water and slowly release it
  later
• They store of water for reuse
• The water might be infiltrated into the ground
  but the ground has to be OK.
• It might be treated by settlement (in a swale or
  basin)
• It might get higher level treatment (in a pond)

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The Undeveloped site
Canopy Interception
Evapo-transpiration
Surface Runoff
Interflow
Baseflow
Runoff hydrograph
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The Developed site
Rainfall is almost completely converted to runoff
because it is unable to percolate into the soil
Flow (Q)
New Runoff hydrograph
time
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The effect of Urbanisation
Q
t
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Storage is used to control outflow
Possible Infiltration
This will give benefits for both water quality
and flow attenuation
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Flood Peak Attenuation
By temporarily holding some volume,
Q
t
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The process of flow attenuation
Some volume is held ...
Q
t
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How do SUDS work?

• Some examples follow

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Plastic Cell Storage
Good for water storage and re-use Best for roof
water Car park water must be treated
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SUDS integrated with the landscape
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SUDS integrated with the landscape
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Integration with playpark, Dortmund, Germany
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Green Roofs
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Water Butt Tayside
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How do they affect the National Park?

• Accidental pollution is of key concern.
• Most of the receiving waters are very sensitive.
• Flooding of less concern.
• SUDS required for all new developments

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Scottish Water

• Only of interest where there is a drainage
  network.
• Will adopt some types of SUDS
• Underground SUDS
• Basins
• Ponds
• Design details in Sewers for Scotland 2.

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SEPA

• Prime concern is water quality
• Will be happy to discuss SUDS requirements.

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Thank You