The Toshka Lakes
As Lake Nasser—Nubia became filled to capacity in the 1990s, a side valley (the “New Valley”) to the west of the main lake at Khor Toshka was flooded. Around 2002, this had created four additional lakes, with a maximum surface area of ca 1,500 km2, holding about 5 × 109 m3 of water. Part of this evaporates, and part recharges the underlying aquifer. Around 2006, however, with a dwindling water supply, the lakes had started shrinking, and lake 3 even dried out. At the beginning of the flooding, a more or less truncated Nile fauna and flora invaded the Toshka valley, and soon up to 7,000 t of fish (mainly Tilapia and Lates) was harvested from the lakes, but currently the westernmost lake shows a rapidly increasing salinity. The zooplankton, for example, reacts by a striking impoverishment.
KeywordsSafety Valve Nile Perch Side Valley Nile Basin Main Lake
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