Info

many, a total of 550 water sources (more than 20% of the total number) were taken out of the water supply network between 1980 and 1992 because of anthropogenic pollution. Thus, dependence on long-distance water supply was increased. In 1993 there were only three, large-volume, long-distance water supply systems left, the area called Donauried, Lake Constance, and the drinking water reservoirs in the Black Forest. The Donauried supplies the metropolitan region of Stuttgart. In this important region for water supply, nitrate concentration rose continuously from 10 mg l"1 in 1930 to 40 mg l"1 in 1993 (Fig, 5.2.7; Lehn et al. 1996). In 1990, it was predicted that this source region would have to be taken out of the supply network in 10-20 years (because the EU limit for nitrate in drinking water of 50 mg 1_1 would be exceeded). However, there are indications that nitrate pollution has stabilised, possibly as a consequence of environmental measures (reduced input of liquid fertiliser in the source region and nature protection). This shows that environmental problems can be managed if it is politically desired.

Year

Pig. 5.2.7. The change in nitrate concentration in Donauried since 1930. (After Lehn et al. 1996)

Year

Pig. 5.2.7. The change in nitrate concentration in Donauried since 1930. (After Lehn et al. 1996)

Was this article helpful?

0 0

Post a comment