The WaX funding initiative published three impulse papers on extreme water events. They offer practical approaches to heavy rainfall, drought, and water storage. Topics include nature-based prevention, early warning systems, urban infrastructure, and the use of rainwater in dry periods—presented in a way that is easy to understand for policymakers and practitioners.

The first discussion paper of the funding initiative was published in June 2024 under the title “Heavy Rainfall and Flash Floods.” It brings together new scientific findings and practical tools in six key points designed to help municipalities manage the risks of heavy rainfall. These include nature-based, decentralized water retention measures, the targeted designation of emergency drainage routes, and innovative methods for more accurate forecasting of heavy rainfall and flash floods.

In September 2024, the WaX discussion paper “Drought and Low Water” followed. It outlines approaches for a sustainable and precautionary response to drought events. Key topics include drought monitoring and early warning systems, urban blue-green infrastructure, dynamically controllable sewer networks, new precautionary and management concepts for drinking water utilities, as well as consensus-oriented prioritization and conflict-resolution strategies among different water users.

The third WaX discussion paper, “Water Storage,” was published in May 2025. It highlights how flood and drought preparedness can be effectively combined and presents storage measures developed or studied within the initiative. Supported by practical examples and a compendium of storage profiles, it illustrates how surplus rainwater can be stored and made available during dry periods.