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19
The average analysis of this unfiltered and untreated
water is as follows:
Bacteriological—
97.9% samples Bac. Coli absent in 100 c.c.
1.6% ,, ,, ,, present in 100 c.c.
.4% ,, ,, ,, ,, in 10 c.c.
Chemical—
Ammonial Nitrogen .0001
Albuminoid Nitrogen .0014
Oxidised Nitrogen .51
Chlorides 1.73
Oxygen absorbed in 3 hours .01
Permanent Hardness 8.2
Total Hardness 28.8
Rivers and Streams.
On seven occasions minor pollutions of streams were
reported. None of these were of a serious nature—arising
mainly from blockage of flow. These were all remedied
without difficulty.
A pond in Crown Lane was cleared of refuse, but the
nuisance from midges and mosquitoes continues and is a
matter which is receiving the attention of the Committee.
Drainage and Sewerage.
No extensive drainage or sewerage alterations have been
undertaken during the past 5 years, excepting that applicable
to new housing estates.
Main drainage system of Bromley joins that of the undertaking
of the West Kent Main Sewerage Board.
Bromley has 4 representatives on this Board, whose
new purification works are at Long Reach, Dartford. The
effluent is finally discharged into the River Thames.