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a few isolated houses adjoining the canal at Top Locks.
Building operations are proceeding in the vicinity, and it is
probable that in the near future the sewers may be extended
to drain this area.
I am indebted to our Surveyor and Engineer, Mr. J. B.
Thomson, A.M.I.C.E., for the following particulars :—
The Sewage enters the Disposal Works at two different
points. What may be termed the high level outfall sewer
takes the Sewage from the District proper. This enters the
Works by passing through a small chamber controlled by
valves, and thence into and through a receptacle in which is
fixed one of Smith's Patent Revolving Wire Screens.
This screen consists of a water-wheel—driven by the
momentum of the Sewage—which causes an endless band of
wire net to revolve slowly, thus catching and lifting all
suspended matter beyond a certain size. A brush revolving
in an opposite direction cleans the net as it passes, and the
solid matters are cleared to one side and removed by manual
labour. The Sewage then passes through a well, inside the
liming house, and from thence through two valves into one
or the other of two small detritus tanks covered with corrugated
iron. These tanks have a total capacity of 24,000 gallons. At
the centre of the length of these tanks, scum boards are fixed,
the bottom edges of which are at a distance of 24 inches below
the level, the upper edges being above the water level ; the
outlet end of the tanks have also scum boards projecting to a
distance of 12 inches below the water level, and the top edges
of same, of course, being above the water level.
The Sewage passes under these boards and over a lip in a
continuous stream into a carrier.
Four Precipitation Tanks of (300,000 gallons capacity are
in use, with the necessary apparatus in connection therewith.
The tanks are arranged so that they may be used on the
intermittent or continuous principle.
The lower outfall takes the Sewage from one Institution
only, viz. : Hanwell Asylum, and discharges into two covered
tanks, the combined capacity of which is about 57,000 gallons.
The Sewage from these tanks is pumped up through a rising
main and discharges into a well at the liming house before
mentioned, and then passes through the same process as the