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The following is the report on a representative sample as supplied to
the consumer.
(a) Physical Examination
Colour Faint Blue Taste normal
Appearance Bright and clear Smell none
Electric Conductivity at 20 °C 300 Units
(6) Chemical Examination in parts per million
Total solids dried at 180°C208
Chlorine in Chlorides as Chlorion 20.5
Nitrite Nitrogen 0.04
Nitrate Nitrogen 10.5
Ammoniacal Nitrogen 0.02
Albuminoid Nitrogen 0.00
Oxygen absorbed in 4 hours at 27 °C 0.10
Alkalinity as CaCO3 57
Hardness as CaCO3—Carbonate 57
Non-carbonate 72
Total 129
Free Carbon dioxide as CO2 —
Residual Chlorine 0.03
Iron none
Other metals none
(c) Bacteriological Examination
Number of colonies developing per millilitre of water:—
on agar in 2 days at 37 °C. 0
on agar in 3 days at 22 °C. 2
Bacteria of indication enumeration:—
Organisms of the coliform group 0 per 100 ml.
Streptococci 0 do.
CI. welchii 0 do.
Remarks:
This water is attractive in appearance, of good organic purity and is free from
contaminating metals. It is of moderate hardness and the chemical composition
is similar to that of previous samples from the same source. The residual chlorine
indicates that precautionary treatment is being maintained.
The bacteriological condition of the water is good.
As judged by this examination the water is pure and wholesome and is fit for
drinking and domestic use.
Drainage and Sewerage
The sewage of the district is pumped to the works of the Croydon
Corporation in Beddington by way of two 21" mains. The pumps are electrically
driven. This arrangement whilst generally satisfactory is subject
to two risks which have occurred at very infrequent intervals. The greater
one, which occurred recently, is the complete failure of the electirc power
supply for a matter of hours with the resultant overflow from the receiving
chambers and the flooding of the grounds of a number of houses in
Buckhurst Avenue near the Pumping Station by crude sewage which
thereafter finds its way by gravitation into the adjacent River Wandle.
The other risk is fracture of one of the rising mains which conducts the
sewage to Beddington. The chances of both mains being fractured at the
same time is extremely remote and has never occurred. The Council
have agreed a plan for the installation of stand-by pumping machinery
in the form of a diesel engine generator at an estimated cost of £22,000.
Leaks on both 21" rising mains were repaired during the year.
Two short lengths of new surface water sewers have been laid in Culvers
Avenue and a short extension laid to an existing surface water sewer in
Wrythe Lane.
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