Excavate a slightly larger hole than that required to
house the Stormcell® blocks, to the required depth.
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Excavate a trench to house the main through flow perforated
pipe which will carry low flows, hence bypassing the
storage system.
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Assuming all surface water is to be discharged into
the continuation drainage system (ie. that no soakage
to the soil below is permitted), lay an impermeable
membrane over the base of the excavation and up the
sides.
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Lay the through flow pipe in the trench, surrounded
by appropriate aggregate as a bedding material.
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| Install any distribution/collection perforated pipework
that may be required to spread the surface water beneath
the entire area of the Stormcell® installation. |
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Refer to pipe manufacturer's technical information regarding
flow capacity through perforations. The pipework should
be capable of passing the peak flow rate for the design
storm through these perforations into the storage system
above). Again, appropriate bedding should be used and
these pipes should be laid to self-cleansing gradients,
draining into the through flow pipe
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Lay a levelled volume of aggregate to cover this pipe
system.
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Position the Stormcell® blocks within the void in
stretcher bond fashion wherever possible. No connections
between blocks are required.
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On top of the Stormcell® blocks lay a light geotextile
to prevent aggregate from infiltrating and clogging the
top of the Stormcell® 'tubes'.
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Lay a venting pipe system (typically 100 mm diameter perforated
pipes laid holes down and surrounded with aggregate) over
the Stormcell® and connect this to the upstream and
downstream manhole chambers. This allows the air that will
be pushed upwards by the rising water level in the tank
to escape.
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Cover with the impermeable membrane to create a watertight
seal in accordance with the membrane manufacturer's
recommendations.
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Fill the trenches around the sides of the installation
using either sand, granular material, or concrete. This
protects the weaker sides of the Stormcell® block from
damage.
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Lay the appropriate surfacing on top to a minimum dimension
of 300 mm if traffic is required to pass over the installation.
This depth is required for works traffic to pass over during
installation of the site but can be reduced, as appropriate,
following completion of site works.
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All aggregate should be of a consistently large size
single stone with no fines, eg: 25 to 40 mm.
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