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flooding, from time to time, when heavy storms cause the sewers to be surcharged.
However, work now being undertaken to obviate the trouble caused
by storm water continues,and the position is gradually improving year by
year.
Water Supply
I am indebted to Dr. E. Windle Taylor, Director of Water Examination
for the Metropolitan Water Board, who kindly supplied the following reports:-
"The supply was satisfactory both as to quality and quantity throughout
1969.
All new and repaired mains are disinfected with chlorine; after a
predetermined period of contact the pipes are flushed out and refilled;
samples of water are then collected from these treated mains; and the
mains are returned to service only after results are found to be satisfactory.
The quality control from these laboratories is carried out by means
of daily sampling from sources of supply, from the treatment works or
well stations, from the distribution system, and through to the consumer.
Any sign of contamination or any other abnormality is immediately investigated.
No houses were permanently supplied by standpipe. No artificial fluoride
was added, and where the fluoride content is indicated in the analysis it
represents the naturally-occurring fluoride in the water.
The supply was derived from the following works and pumping stations
River Thames - derived water from Surbiton, Hampton and Ashford
Common Works.
No new sources of supply were instituted and there were no changes
to the general scheme of supply in your area.
The number of samples collected and the bacteriological and chemical
analyses of the supply from the above sources after treatment are shown on
the attached sheets.
On account of their hardness content and alkaline reaction the Board's
river and well water supplies are not considered to be plumbo-solvent.
It should, however, be appreciated that all types of water pick up varying
amounts of metal from the material of water piping particularly when it
is newly installed; this applies to copper, zinc, iron, and also to lead.
Surveys carried out between 1966 and 1968 on analyses of water from consumers'
premises confirmed this statement."
Chemical Examinations:(Milligrammes per litre unless otherwise stated).
All Thames derived
Ammoniacal Nitrogen
0.024
Albuminoid Nitrogen
0.083
Nitrate Nitrogen
4.4
Oxygen abs. from KMno4 4 hrs at 27oC.
1.05
Hardness (total) CaCo3
282
Hardness (non-carbonate) CaCo3
79
B. 15