This report by the Joint Research Centre is providing data related to the severe drought of 2022 in Europe. 

The severe drought affecting many regions of Europe since the beginning of the year has been further expanding and worsening as of early August.
The severe precipitation deficit has affected river discharges widely across Europe.
Reduced stored water volume has had severe impacts on the energy sector for both hydropower generation and cooling systems of other power plants.
Recent precipitation (mid-August) may have alleviated drought conditions in some regions of Europe. However, in some areas, associated thunderstorms caused damages, losses, and may have limited the beneficial effects of precipitation.
Warmer and drier than usual conditions are likely to occur in the western Euro-Mediterranean region in the coming months till November 2022. In some areas of the Iberian Peninsula, warning drier than usual conditions are forecasted for the next three months.