SuDS in London - a guide

Actions and results
• Two rain garden bioretention basins
have increased the attenuation storage
capacity of the streetscape, reducing
the likelihood of water being conveyed
to the combined sewer overflow.
This measure allowed 30% more
water to infiltrate into the subsurface,
compared with a conventional
grassed area of comparable size
• Trees were planted within the de-paved
rain garden areas. This addressed
the hydrological balance of the
site and the impact of noise and air
pollution by providing a physical noise
barrier and zone for air exchange and
particulate accumulation. Special
consideration was given to the drainage
and growth capacity of each tree
Benefits
• Reduces street flood risk by increasing
attenuation storage capacity
• Reduces noise and air pollution
• Establishes a new carbon sink
through tree planting
Lessons learned
Modest public realm improvements can
promote partnerships between a range
of stakeholders
After
After
100 5 Case studies