Environmental Engineering Reference
In-Depth Information
Figure 13.4.
Chemical and biological recovery of the River Tame at three sites.
(Annual average ammonia (asN) concentrations in relation to average number
of taxa (BMWP families) taken from a long-term dataset (
50 years). Major relevant
events are shown as vertical dotted lines. Data from Southampton University
Historic River Data Archive (acknowledgements to Mr F. S. Woodiwiss and the
Environment Agency.) A, 1961 Rivers (Prevention of Pollution) Act implemented;
B, Midlands recession starts; C, coal gas production ceases; D, Black Country Sewer
completed; E, Tame treatment lakes fully open.
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