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materially reduced the possibility of back-flooding in the soil
sewers during severe rain storms, so common in the district
in past years.
All new houses constructed are required to have a
dual system of drainage, under the provisions of the Chiswick
Urban District Council Act, 1911, and where the old
systems of house drainage of existing houses are re-constructed,
the separate system is put in wherever possible.
Mr. E. Willis—the Council's Engineer—has kindly
furnished me with the under-mentioned particulars:—
Approximate number of miles of soil sewers 26
Approximate number of miles of surface water
sewers 20
The sewage reaches the Council's Sewage Disposal
Works, situated in the Southern part of the district, and
adjoining the River Thames, by gravitation where it has to
be first lifted. I am indebted to Mr. Abbott—the Council's
Sewage Engineer—for the following information and
statistics:—
(a) Brief Summary of Method of Sewage Disposal—
The sewage is chemically treated in continuous
precipitation tanks, and the effluent therefrom is further
purified on bacterial filters worked on the contact bed
principle before being discharged into the tidal portion
of the River Thames. The sludge is filter-Pressed prior
to disposal.
(b) Quantity of sewage treated during 1925—
894 million gallons.
Until the latter end of the past year, few complaints
have been received respecting offensive effluvia or nuisance
arising from these works—a fact which speaks well for their
efficient management and control. During the period above
referred to, however, a trade effluent originating from local
Yeast Works has caused considerable trouble by reason of
the offensive effluvia therefrom. Mr. Abbott—the Sewage
Engineer—was fully alive to the difficulty, and had, I believe,
drawn the Council's attention to its possibilities when the
Yeast Works were first established. Steps were at once taken
to mitigate or rather prevent the nuisance, but the matter