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83
WATER
I am indebted to the Water Engineer, W. C. Knill, Esq.,
B. Sc., M. I.C. E., M. I. Mech. E., M. I. W. E., for the following data: -
About nine-tenths of the Borough is supplied with water by
the Corporation. The districts of Spring Park and New Addington,
comprising about two square miles in area, are supplied directly
by the Metropolitan Water Board, this water being derived from
wells in the Chalk.
Public supply mains are laid throughout the Borough and
every dwelling house is connected to them; the entire population
thus receives piped supplies from statutory supply authorities.
The supplies have been satisfactory in quantity and quality
throughout the year. None of the waters in supply have "plumbosolvent"
characteristics.
Most of the Corporation's supplies are drawn from deep wells
in the Chalk, but a supplementary supply, of Thames-derived
water, is purchased in bulk from the Metropolitan Water Board
and distributed by the Corporation in the northern part of the
Borough. The wells are situated at the Surrey Street, Stroud
Green, Waddon, Selhurst and Addington pumping stations. The
water from all of the wells is treated by the addition of
chlorine, and ammonia is added after chlorination to the Surrey
Street, Waddon and Addington supplies. Owing to the occasional
occurrence of turbidity in the raw water from the Addington
Well, this water is filtered before chlorination.
The quantity of water supplied during the year 1960 was:
From Corporation Wells 2,543,541,000 gallons
Purchased in bulk from M. W. B. 794,415,000 gallons
3, 292, 205, 000 gallons
(a) Bacteriological Examinations.
Regular bacteriological examinations were made of the raw
waters going into supply following treatment. 496 samples of
raw waters and 1,034 samples of treated waters were examined by
the Chemist and Bacteriologist of the Water Undertaking. In
addition, 14 samples of raw waters and 30 samples of treated
waters were bacteriologically examined by the Consultants to the
Corporation. Further samples were submitted by the Medical
Officer of Health for examination by the Public Health Laboratory
Service.