, tracked long-term water storage gains and losses across Africa's 13 major aquifers and found opportunities for sustainably withdrawing groundwater across much of the continent.
The researchers used data from NASA's GRACE satellites to track total water storage in the aquifers from 2002 to 2020. The result is an 18-year timeline that provides a longer-term perspective on water trends and what drives them. This pattern means that although years with little rainfall can cause sharp declines in water storage, the rain eventually returns and readily refills the aquifers when it does. This helps protect the groundwater from long-term depletion, Scanlon said.
And even in northern Africa, where groundwater showed a steady decline in water storage due to all three of its aquifers being tapped for irrigation, the study notes that the sheer volume of water held in theseprovides an extra buffer. However, sharp declines may occur locally, affecting groundwater supplies in local wells and oases.
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