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1. (i) Water Supply.
The supply to Bexley district is derived from several
sources, namely, Wilmington, Darenth, Wansunt, Crayford,
Bexley and Deptford wells, and Thames-derived filtered
water. All the water is chlorinated as it leaves the works.
Bacteriological analyses are made at least five times
per week of all supplies and, in the case of the wells, the
water is sampled both before and after chlorination. Water
derived from the River Thames is sampled at each stage of
the purification process. Tanks to provide an adequate
period of contact of the chlorine with the water are now in
operation at Wilmington, Crayford, Bexley and Deptford.
All new and repaired mains are chlorinated before being
restored to use and samples of water from them are tested
bacteriologically.
The examination of samples of water from piped
supplies to houses at least monthly has given the following
results:—
Bacteriological.
(Minimum and maximum numbers of organisms.)
No. of organisms per c.c. capable of B. coli
growth on Agar at: presumptive
37° C 22° C
0-5 0-98 0-13 in 100 c.c.
(ii) Drainage and Sewerage.
The following foul and surface water sewers were laid
during the year:—
East Rochester Way—
78 Lin. yards Foul Sewer.
Brook Lane—
196 Lin. yards S.W. Sewer.
2. Rivers and Streams.
Complaints were received during the year regarding the
unsatisfactory condition of the lake on the Blendon Estate.
Samples of water taken revealed no sewage pollution, but
there was evidence of decomposition of organic material,
probably from the surface water drainage discharging into
the lake, and from decaying vegetation in the lake.
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