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At left, the drought of September 1979; at right, the floods of November 1999
Since operation of the Diama Dam on the Senegal River began in 1988, experts have observed a lowering of the water level, desalinization, and silting. The changes pose a threat to the fauna and flora. There has been in particular a proliferation of typhas and phragmites. To the left, satellite photos take by NASA in 1979 (before construction of the dam) and 1999 (afterwards) give evidence of the significant impact on the region's ecosystem.
In 2006, though no cases of avian flu had been reported in Senegal, a monitoring program was put into effect.