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162
TABLE B.
TABLE showing the maximum, minimum, and average proportions
of organic impurities in the water delivered by the several
Companies and Authorities during 1889:—
Sources.
Maximum.*
Minimum.*
Average.
Deep Wells
Kent
1.1
0.4
0.7
Colne Valley
1.6
1.2
1.4
Tottenham
1.7
0.5
1.3
River Lea
New River
2.1
0.6
1.5
. East London
3.5
1.2
2.7
River Thames
Chelsea.
6.1
1.4
3.2
West Middlesex
5.1
1.6
2.9
Southwark
6.0
1.6
2.7
Grand Junction
5.2
1.5
2.5
Lambeth
4.2
1.6
2.5
*For purposes of comparison the average yearly amount of organic elements
(organic carbon and organic nitrogen) found during the nine years ending 1876
in the water supplied by the Kent Company is taken as the unit.