DEFINITIONS OF OUTSIDE AREAS
Bund Wall Defined
A lined wall around oil tanks designed to catch
all oil that leaks from it. It therefore should have the
capacity to retain the volume of oil held within the oil tank and
also be oil tight.
Back Siphonage Defined
The sucking back of dirty water from within a building
leading to backflow into a water main if its pressure drops. All
water authorities have regulations to prevent this pollution of
the main, eg. by having an air gap under the draw-off taps of sinks
or drinking fountains, or ballvalves of cisterns. A ballvalve
with a silencing pipe must have an anti-siphon hole
Benching Defined
Concrete in the base of an inspection
chamber, cast to form a deep channel sloping gently up to the walls
each side. It
ensures that no solids are left after flooding and is stood on
when rodding.
Manholes Defined
As part of the current Building Regulations, you
are required to have a manhole (or in some instances a rodding
eye is allowed) at each change of direction of the drains or where
new drains join an existing run.
Rodding Eye Defined
This is a small access hatch that is used for
rodding the drains should they block.
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