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24
adjacent to Bedford Terrace across Elmgrove Building
Estate into Woodlands Road, and into and along the
Lane to Disposal Works. From manhole 7 along the
Lanej where there may be new Estates developed in
near future, a 21 inch sewer will be laid. All houses
erected during past 10 years have the dual system of
drainage, and the sewers are laid on this system. The
scheme allows for increase of population for next 6 or 7
years. For South District screening and grit chambers
in duplicate are to be constructed for removal of the
coarser solids, and also 2 detritus or sludge settling tanks,
one of 48,000 gallons capacity, and another or 108,000
gallons capacity. Three filter beds are to be constructed,
each 65 feet in diameter, and 5 feet in depth. From these
the effluent will enter humus catch pits, and be finally
distributed for land treatment over the new field of 11
acres, know as Shepherd's Lay.
For North District it is proposed to construct an
additional open septic tank of 195,000 gallons capacity,
leaving room at side for future extension if necessary.
Seven new filters are to be made, each having a diameter
of 65 ft. and a depth of 4ft. bin. The effluent from these
can be distributed over the lowest portion of the newfield,
and also over existing field on South side of brook
for land aeration before discharging into brook-course,
Tfie existing storm water filters are to be reconstructed
and drained, and an additional filter made. In order to
dry the sludge a properly-coustructed sludge filter bed
with under drains and filtering material is to be formed
in place of the present undrained lagoons. The drained
sludge water will be collected in a well, whence it is to
be lifted by means of a small oil engine and pump and
discharged into one of the sedimentation tanks for retreatment.
Finally, a portable tramway and skips to
remove the coarse solids from the screening chambers
to the sludge lagoons, and afterwards the sludge to the
further end of the field is to be laid down. Estimated cost
£12,573.
At the time of writing I am given to understand
that the assent of the Local Government Board to the
general plan of the scheme has been received, but that
certain alterations and additions are to be made, which
although increasing the cost by several hundreds of
pounds, will add to the utility and effectiveness of the
works when completed.
Mr. Walker, your Surveyor, very kindly supplies the
following interesting summary of the rainfall during
1908 :—