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Drainage and Sewerage.—The district has separate sewers for
foul and surface water. Sewage is disposed of by an arrangement
with the Croydon Corporation whereby the whole of the sewage
of the district is pumped to the works of that Authority.
The scheme referred to in last year's report for providing main
lines of drainage for the southern end of the district was completed
in 1937 and the Western Valley section, ending in Grove Lane,
has been extended by the Estate developers up to Clock House
Farm to provide drainage for that Estate.
Following the completion of the Southern Extension Scheme
No. 2, as mentioned above, the drainage of the Surrey County
Council's Smallholdings, Little Woodcote Estate, was proceeded
with by this Council acting as agents for the Surrey County Council
and the works were within a few weeks of being finished by the
end of 1937.
In the Culvers area the scheme described in the report for 1936
for the abolition of the Nightingale Road Pumping Station with
re-drainage to the main Culvers Pumping Station has been completed,
the old station being put out of action in December.
The £12,000 surface water drainage scheme, described in the
report for 1936 was completed early in 1937 and appears to have
been effective in removing nuisance of flooding at various places
between The Warren and the Upper Pool where the new sewer
discharges.
Fifty drainage obstructions, affecting 326 houses, were dealt
with and drainage repairs were executed at 52 premises.
Rivers and Streams.—The heavier winter rainfall of the past
two years has had its effect in the maintenance of a stronger and
more continous flow from the springs which form the source of
one head of the River Wandle in this district. The routine work
of cleansing was carried out, but no works of major importance
were undertaken.
In its course through the district, the River Wandle fed two
groups of watercress beds. In the autumn, as the result of the
attention which was directed to watercress during the typhoid
outbreak in Croydon, special investigation of these beds was undertaken
and samples of the water in which the commodity was grown
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