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tanks and diffused air reaeration tanks. For the
treatment of trade waste, there are two transverse
flow mechanical sedimentation tanks. An automatic
effluent pumping station lifts mixed final
effluent to the river when tides are too high for
gravity flow. Raw domestic sludge and activated
sludge are treated in heated digestors before
disposal on ploughed land, whilst trade effluent
sludge, being inoffensive, is sent direct to the land.
The works are under the direction of the Borough
Engineer and Surveyor with a Chemist in charge at
the works. In addition to the Chemist, who is
responsible for the operation of the plant, a resident
Works Manager attends to works maintenance and
two laboratory assistants carry out tests in the
well-equipped laboratory maintained. It may be
added that these tests include Atmospheric Pollution
Examinations for the Borough. The two Pumping
Stations and the contiguous Compressor House for
the diffused air Reaeration plant, are staffed by a
continuous shift of driver and assistant driver, 9
men in all being employed for this purpose. These
men also provide attention for the works generally
during the nights and week ends. The Activated
Sludge and Sludge Digestion plants are operated by
a plant operator with two labourer assistants. The
sludge areas require the services of ploughman,
ploughboy and two labourers, whilst sludging of
tanks, attention to screens, and general works
maintenance are carried out by five labourers. A
wholetime fitter is employed, the total wholetime
staff being four officers and 22 men."
Rivers and Streams.
The upper portion of the district is drained by a
number of channels which run in a westerly direction,
ultimately finding their way out of the area into the