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of high grade purity, and is accepted as a standard of
purity for deep well water. The latest average analysis
available for this unfiltered and untreated water is as
follows:—
Bacteriogical.
During the period 1905-1929, 291 samples have been
taken:—
97.2 per cent, samples B. Coli absent in 100 c.c.
2.1 ,, ,, ,, ,, ,, present in 100 c.c.
0.7 ,, ,, ,, ,, ,, present in 10 c.c.
Chemical Averages for 1929.
Ammoniacal Nitrogen 0.0006
Albuminoid Nitrogen ... 0.0024
Oxidised Nitrogen ... 0.57
Chlorides 2.57
Oxygen absorbed in 3 hours 0.011
Total hardness ... 30.8
Permanent hardness ... 8.2
At Bickley there is a circular covered reservoir standing
307 feet above sea level, of a depth of 10 feet, holding
1½ million gallons, and also a duplicate rectangular covered
reservoir, 10 feet deep, holding 1½ million gallons. In
the Downham district of Bromley there is a large covered
reservoir holding 5 million gallons, of a depth of 16 feet,
and standing 250.5 feet above sea level. The supply for
these reservoirs is from the Shortlands valley.
Scavenging.
There was no extension, or improvement of the methods
of scavenging, or refuse disposal, put into operation during
the year 1930, except that a further electric vehicle was
purchased during the year. The refuse is now collected
by means of three petrol vehicles, two electric vehicles and
three horses and vans.
Provision is being made for more frequent cleansing
of the streets.