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to be of hollow construction, using honeycomb brickwork, perforated
concrete sections or plastic creates which are readily available
from local builders’ merchants. Chamber size depends upon the
volume of water to be received, and the porosity of the ground.
Within the Borough of Broxbourne, experience
has shown that a soakaway of 1m³ internal capacity below the level
of the pipe is a minimum size which is usually sufficient for a
Where a catchment area exceeding 75m² is to be
drained, reference should be made to BRE (Building Research
Establishment) Digest 365. This may be
available through your local reference library or can be ordered
from the BRE bookshop on 01923 664444.
Soakaways should be situated no closer than 5
metres to any building or boundary. Once the chamber is in
place, backfill the surrounding excavation with granular material
such as hardcore, to allow effective drainage.
To reduce the risk of flooding, the soakaway
should be located downhill from the property unless the ground is
A reinforced concrete cover for the chamber
may be purchased from a builders’ merchant for either a concrete
ring or honeycombed brick soakaway. Alternatively, where the
span across the soakaway is no more than 1.0m, one may be
constructed of 150mm thick well compacted concrete of 1:2:4 mix,
with A142 mesh reinforcement placed 50mm from the bottom.
Plastic creates should be installed in
accordance with the manufacturers' recommendations and surrounded
with a permeable geotextile membrane. A heavy duty grade must be
used if there is to be traffic travellling over.
© 2013 Broxbourne Borough Council All rights reserved.
Bishops' College, Churchgate, Cheshunt, Hertfordshire. EN8 9XQ. Tel: 01992 785555