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Additional beds will be necessary at intervals. On the basis
of a steady increase of population at the rate of goo per annum at
30 gallons per head will equal 2700 gallons. In two years the
present flow will be increased by 54000 gallons, and it will be
necessary to proceed with extra slate and fine beds for dealing
with this further 54000 gallons per day, in order that they may be
finished and in working order by the time they are required.
I append a detailed report of Mr. Jeffes, your Surveyor, on the
alteration, and method of sewage disposal carried out at the
sewage works in California Road.
To R. Davison. Esq., M.D.,
New Maiden.
The Maldens and Coombe Urban District Council.
February 24th, 1910.
REPORT ON METHOD OF SEWAGE DISPOSAL.
The sewage from all parts of the District gravitates to the
Sewage Works and is discharged through a 6ft. barrel sewer,
which also acts as a storage for the night flow, into a sump or
pump well, situated under the pump house. Owing to the floor
of the sump being at a higher level than the invert of the sewer
delivering into it, it has not been possible to clear the barrel
sewer of the accumulated sludge deposited therein, with the
result that this barrel sewer has gradually sludged up to a considerable
extent.
In accordance with plans prepared under my direction, alterations
of an arduous and difficult nature have recently been
completed, involving the deepening of the sump to a depth of
about 3ft. 6in. below the barrel sewer, and provision of a new
and wider channel from the barrel sewer to the pumps ; also an
extension to the suction of the 12in. centrifugal pump, and other
general improvements to the sump, which will have the effect of
clearing the barrel of sludge, and enable the sewage to be
delivered to the tanks in a more uniform character than has been
formerly done.
The sewage, after reception in the sump, is lifted by means
of a 12in. Tangye centrifugal pump and two three-throw plunger
pumps, of 12in. and loin, diameter respectively, into the delivery