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16
TABLE C.
TABLE showing the efficiency of filtration of Thames and Lea water, also the
maximum, minimum, and average proportions of organic impurity in the water
delivered by the different Companies during the year 1883.
Names of Companies
and Sources.
Number
of
occasions
when
clear and
transparent.
Number
of
occasions
when
slightly
turbid.
Number
of
occasions
when
turbid,
Number
of
occasions
when very
turbid.
Proportion of
Organic Impurity.
Maximum.*
Minimum. *
Average.*
Thames.
West Middlesex
11
1
0
0
5.7
2.0
3.7
Grand Junction
9
8
0
0
5.3
2.4
3.4
Lambeth
11
1
0
0
5.7
2.0
3.6
Chelsea
11
1
0
o
4.7
2.0
3.1
Southwark
7
5
0
0
6.6
1.9
3.6
Lea.
New River
12
0
0
0
3.6
1.3
2.2
East London
12
0
0
0
5.0
1.9
2.9
Deep Wells.
Kent
12
0
0
0
1.5
0.9
1.1
Colne Valley
12
0
0
0
1.5
1.0
1.2
Tottenham
11
0
0
1
1
2.3
1.1
1.7
*The average yearly amount of organic elements (organic carbon
and organic nitrogen) found in the water supplied by the Kent Company,
during the nine years ending 1876, is, for purposes of comparison, taken
as the unit.