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172
pumping station and the general flood relief scheme of 1919 provides for the enlargement
of this station and the substitution of gas for steam power, at a cost of approximately
£60,000. At the end of the year the installation of the machinery was well
advanced.
A penstock in Manchester Road, Isle of Dogs, which prevents storm water
from flowing back from higher ground to the northwards when pumping is taking
place at the Isle of Dogs pumping station a short distance away, could only be operated
on the spot. Hydraulic apparatus is being installed, which will enable the penstock
to be operated from the pumping station, at a cost of £420.
Southwestern
storm relief
sewer.
The south-western storm reliei sewer has been designed to assist the drainage
of Clapham, Streatham, Brixton, West Norwood and Dulwich. It has been completed
at an approximate cost of £300,000. If required, the sewer can be extended
southward to relieve the Effra Branch sewer at West Norwood. The length from
Effra Road to Nine Elms is 2§ miles, and in order to expedite the work it was made
the subject of two contracts—(i.) between Effra Road and Clapham Road, completed
in February, 1924 ; and (ii.) from Clapham Road to the Thames, begun in March,
1923, and completed in March, 1926.
Storm relief
sewers in
Lewisham
and
Woolwich.
The scheme of relief sewers in Lewisham and Woolwich is described in the
Annual Report for 1923 (vol. III., p. 128). The construction of the Lewisham
branch sewer (Bell-green, Lower Sydenham, to a junction with the southern highlevel
sewer No. 2 near Court Hill Road, Lewisham), and of a branch sewer from
Catford station has been completed. Owing to the nature of the ground encountered
in the progress of the work it was decided to carry out the construction of the
Lewisham branch sewer between George Lane and Court Hill Road in iron instead
of brickwork, and to use compressed air in connection with this portion of the work.
The additional estimated cost in this respect is £5,000. The construction of the
Eltham sewer (from the junction of the Council's existing Eltham sewer and the
local sewer in Eltham Road, near Eltham Green, to the southern high-level sewer
No. 2 at Charlton), had not been completed by the end of the year. The approximate
cost, of the two sewers is £524.500.
Shad Thames
pumping
station.
Shad Thames pumping station, opened in 1909, was designed to accommodate
six pumping sets, but as a first instalment three only were put in. The flood relief
scheme of 1919 included proposals for completing the equipment of this station.
The second instalment, consisting of three engines and pumps, is being added at
an approximate cost of £22,000.
Northwestern
storm relief
sewer.
The north-western storm relief sewer will extend from Kilburn to Hammersmith
and has been designed to relieve floodings in Willesden, Paddington and
North Kensington. The works comprise the construction of the principal sewer
which will be connected with the Ranelagh sewer in Shirland-road, Kilburn, and
will run to the nearest point on the Thames, at Hammersmith, connecting with
various main sewers on the way. Branch sewers will be constructed to connect
the new sewer with the middle level sewer in Ladbroke-grove, and with the Woodlane
sewer at Wormwood Scrubs. A connection will also be made with the new
pumping station at Hammersmith. Altogether the construction of about 5¼ miles
of sewer is involved, the approximate cost being £527,000. The principal sewer is
being constructed for a length of about 2¼ miles in tunnel, largely under compressed
air, of cast-iron segments lined with concrete, including the connection from the
Hammersmith Pumping Station to the Stamford Brook Sewer in King Street,
Hammersmith.
The remainder of the total length of about 5¼ miles, including the branch sewers
named, has been constructed in brickwork in tunnel, except for two short lengths
in cast-iron segments lined with concrete.
The work was let in two contracts, one for the cast-iron sewers, and the other
for the brick sewers.