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DRAINAGE AND SEWERAGE.
The Borough Engineer and Surveyor has supplied the information
that sewerage works totalling approximately
£15,000 have been carried out, including soil sewers, surface
water sewers, and culverts. Work has also been commenced on
the preparation of a comprehensive drainage map of the district.
Consideration has been given to the abolition of cesspools,
septic tanks and chemical closets throughout the district, and
investigations have been made in order to ascertain the extent
of the works required.
Consideration was given to the risk, if any, which might
arise from using the clinker of the filter beds at the old Sewage
Disposal Works. In order to give an opinion the following
observations were made:—
(1) Temperature inside beds. The temperature was taken
inside the delivery pipe at the centre of a clinker bed,
precautions being taken to prevent draughts of air
through the pipe, and was found to be 49 degrees F.
The temperature was then taken outside the bed, in
the shade, and was found to be 53 degrees F. On
replacing the thermometer inside the delivery pipe, the
temperature registered decreased to 51 degrees F. in a
short time. Evidently the temperature inside the bed
was less than the temperature outside at any instant.
(2) Moisture inside beds. The beds were dry at the top
and damp for the bottom four or five feet, as was
shown by trial holes.
(3) Animal or Vegetable growth inside beds. There was
none inside the beds, although grass and small plants
were growing on the tops and sides.
(4) Foreign matter inside beds. There was a small amount
of loamy deposit on the clinker in the lower parts of
the beds.
The Kingsbury Works ceased to receive sewage on the 28th
February, 1936, and the Wembley Works on the 7th April, 1936.
More than two years had elapsed, therefore, which seemed more
than a sufficient time for pathogenic organisms to have disappeared,
so that the opinion was given that the clinker from
these percolating filters could be used for road construction and
similar purposes.
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