The first heat wave has not yet passed and there is another threat of a water shortage: how critical is the situation? And can you just wash your car now?

In the middle of the first heat wave of the year, code yellow already applies to the drought situation: hydroelectric power plants are closing and water may no longer be extracted in some places. How come this has changed so quickly? Is there anything that can be done about it? And can you still spray your lawn carefree? We asked the most important questions to hydrologist Patrick Willems (KU Leuven).

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