Even if, at first, the ecological development of this new freshwater basin seemed to develop favourably, from the beginning of the 1990s, this water body was confronted with unexpected water quality problems. Especially during summer, these circumstances culminate in extensive blooms of toxic cyanobacteria, which severely destabilises the ecosystem and poses a danger to human and environmental health. It can also pose a health risk to inhabitants, and makes the water unsuitable for swimming and drinking water for cattle.