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There is also a softening plant capable of softening 6000 gallons of water
per hour for use at the Croydon Mental Hospital. This water is pumped bytwo
pumping engines each capable of discharging 3000 gallons per hour into
the tank in the Clock Tower at the Hospital.
Stroud Green Well.—The well is sunk to a depth of 390½-ft. from the
surface, the lower 251-ft. in chalk.
The well is lined to a depth of 144-ft. with iron cylinders, the successive
diameters of which are 12-ft., 11-ft. and 10-ft., and the latter diameter is
continued in the chalk.
A 12-in. borehole is put down beyond to a depth of 537-ft. from the surface.
Headings are driven at 230-ft. and also at 365-ft. from the surface. At
the former depth 2,827-ft. 6-in., and at the latter depth, 1,395-ft. of headings
have been driven ; both upwards and downwards boreholes are made in both
sets of headings. The present yield of the Well is about 650,000 gallons per
day. Pumping to mains commenced on the 11th July, 1005.
In 1906, permanent buildings and plant were erected. The machinery
consists of three steel boilers, a triple expansion engine of 250-h.p., two well
pumps and a set of three-throw force pumps capable of lifting 65,000 gallons
per hour into the Addington Reservoir.
Reservoir.—This, situated at Addington Hills, is 420-ft. long, 124-ft.
broad, and 162/3-ft. deep, and holds 5 million gallons. It is built entirely of
concrete, and the ground over it has been planted with heather and gorse.
The valves are placed in a house built over the entrance to the reservoir.
The overflow is 465-ft. above sea level, and 87-ft. above Upper Norwood,
the highest part of the borough.
AREA OF SUPPLY.
On the 29th of September, 1904, the Corporation took over that portion
of the Borough previously supplied by the Lambeth Water Company, and
recently by the Metropolitan Water Board, thus making the Corporation the
water authority for the whole of the Borough. The new area is supplied
with water obtained in bulk from the Metroplitan Water Board.
NEW WORKS.
New works are in progress as follows :—
A low level service Reservoir at Russell Hill to hold ten million gallons.
Waddon Pumping Station.—An Engine and Pumps capable of lifting
130,000 gallons an hour.
Pumping Mains between Surrey Street Works, Waddon Works, and
Russell Hill.
Rivers and Streams.
There are few watercourses in the Borough, and only minor
nuisances—very easily remedied—arise in connection with them.
The most interesting of the watercourses is that of one of the
sources of the Wandle and characterised by the flow of the bourne
(the overflow of the underground water of the chalk) from the
Kvenley Valley.