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Buried Attenuation TanksBuried Attenuation Tanks

Sustainable Urban Design System (SUDS) Sustainable Urban Design System (SUDS)

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ContentsContents::

What is a buried attenuation tank?What is a buried attenuation tank?

How does it work?How does it work?

What are the types of attenuation tank available?What are the types of attenuation tank available?

How are they installed?How are they installed?

MaintenanceMaintenance

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Attenuation tanks are part of the Attenuation tanks are part of the Sustainable Urban Design systemSustainable Urban Design system

Designed to keep the amount of storm water runoff of a specific area, as it Designed to keep the amount of storm water runoff of a specific area, as it was before any development was constructed,was before any development was constructed,by slowing down the water flowby slowing down the water flow

What is an attenuation tank?What is an attenuation tank?

Usually tanks are buried due to their Usually tanks are buried due to their huge sizehuge size

Hydro-break flow control system:Hydro-break flow control system: self-activating by the pressure of the water self-activating by the pressure of the water flowflowdoes not require external energy supplydoes not require external energy supplyrisk of blockage and maintenance reduced risk of blockage and maintenance reduced to a minimum.to a minimum.

Fixed control orifices:Fixed control orifices:

short pipe for control on small/medium size storagesshort pipe for control on small/medium size storages

How is the water’s slow down achieved?How is the water’s slow down achieved?

Tank’s storage volumeTank’s storage volume

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Filters and oils interceptor Filters and oils interceptor improve the quality of the waterimprove the quality of the water

pumping and purification system pumping and purification system can be installed for water re-use can be installed for water re-use

Harvesting and recyclingHarvesting and recycling

When is used:When is used:Shortage of water supplyShortage of water supplyZero discharge restrictionsZero discharge restrictions

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What type of attenuation tanks are available?What type of attenuation tanks are available?

PlasticPlastic

SteelSteel

ConcreteConcrete

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BulkyBulkyTransport problemsTransport problems Installation problemsInstallation problems No shape flexibilityNo shape flexibility

Prefabricated tanks:Prefabricated tanks:

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Assembled on siteAssembled on site

Great flexibility to satisfy Great flexibility to satisfy design requirements and design requirements and site constraints site constraints

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Suitable bearing groundSuitable bearing ground

How are they installed?How are they installed?

Particular attention to joint details Particular attention to joint details when assembled on sitewhen assembled on site

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Access has to be provided for Access has to be provided for inspection and maintenanceinspection and maintenance

Access to tanksAccess to tanks

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Attenuation tanks have to guarantee:Attenuation tanks have to guarantee:

water tightnesswater tightness

long lastinglong lasting

low maintenancelow maintenance

accessibilityaccessibility