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Flooding Solutions (Sustainable Urban Drainage System (Treatment chain…
Flooding Solutions
Catchment wide solution aims
source to mouth
aim to increase lag time
Encourage infiltration
Slow water down
Deal with pollution more effectively
Create wildlife habitats
to increase biodiversity
Create areas with amenity value
Land use
1) Sustainable Urban Drainage Solutions
moving away from simple drainage pipes
Scotland 2006 required all new sites drained by SUDS
2) River Restoration
to more natural behaviour
3) Natural Flood Prevention
= combination of 1 & 2
Catchment wide aproach to reduce flooding downstream
e.g. Eddleston Water Project
Traditional Drainage
Gully pots take up h20
Collect off roots
Pipe transports water to watercourse
little infiltration occurs
Urban vs Rural Drainage
Urban
reduced lag time btwn peak rain & discharge
peaky discharge higher
Rural
infiltration greater
lower discharge
longer lag btwn peak rain & Q
Sustainable Urban Drainage System
Treatment chain
multiple linked systems to collect H20
if one fails another compensates
Temporary lakes
collect & store water during flood
Plant trees
increased evapotranspiration
Filter drains
water flows to gravel to soil
increased infiltration
Permeable pavement
water passes through paving into ground
Swales
water passes through gully to vegetated basins
Detention basin
basin temporarily holds H20
Ponds / wetland / retention pond at end of system
water exits at low rate
Regional Controls
retention pond
wetlands
What SUDS do
SUDS Aims
protect/enhance water quality
be sympathetic to envmtal setting/local needs
habitat provision for wildlife
encourage natural
groudwater recharge
manage runoff flow rates
Essentially:
Decrease quantity + increase quality + add amenity value
1) Deal with runoff close to where rain falls
2) Manage pollution at source
3) Protect H20 resources from point & diffuse pollution
4) Develop where existing drainage reached capacity
River Restoration
Deal with/move away from engineered river solutions
increase interaction of river & floodplain
River Ogwen = restored in places