In its exhibition running from November 2 to December 30, 2026, at the Mainz Environmental Store, the Wirtschaftsbetrieb Mainz highlights the locations in the Drais, Hechtsheim, and Marienborn neighborhoods where hazards arise during heavy rainfall. Heavy rain prevention plans developed by experts propose specific protective measures. These are available for review by affected residents at the Umweltladen. Visitors to the Umweltladen can simulate their personal risk situation during a heavy rain event at their place of residence using flash flood hazard maps or a 3D visualization—the “Hydrozwilling”—provided by the Rhineland-Palatinate State Office for the Environment. In addition, homeowners receive specific information about risks and how they can actively protect themselves from damage caused by heavy rain.