This report provides a comprehensive analysis of the current and future water supply system of Reichenau Island, examining technical, climatic, and biological factors while offering clear recommendations to ensure a reliable, efficient, and future‑proof irrigation infrastructure.
Reichenau Island, the largest island in Lake Constance, is facinges growing climatic, technical, and biological pressures that threaten the stability of its irrigation infrastructure. The water distribution network is complex and partially outdated, and it operates without central control. As a result of climate change, invasive species such as the quagga mussel have settled in the area, threatening existing ecosystems.
The objective is therefore to secure long‑term water availability, modernize technical and implement digital systems, and better manage stress factors such as quagga mussels and peak water withdrawals. To this end, Fraunhofer IGB has analyzed possible technical, digital, and hydraulic improvement strategies and derived concrete recommendations for action based on real measurement data. The unique strength of this study thus lies in the integration of detailed hydraulic modelling, data‑driven scenario assessments, and practice‑oriented measures specifically designed to enhance Reichenau’s long‑term water security.
The measures improve supply reliability on the Reichenau Island, reduce energy consumption, and enable more efficient water distribution even under extreme conditions.
Ensuring irrigation on the Iisland of Reichenau
March 2024 – December 2025
Fraunhofer IGB conducted the study on behalf of Reichenau Bewässerung eG.
Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB