With the expansion of the Füllinsdorf wastewater treatment plant, the Niederdorf and Bubendorf plants will be decommissioned. As a result, less water will be discharged into the Vordere Frenke and Ergolz watercourses. To compensate for this, ecological improvement measures will be implemented. HOLINGER will carry out a situation analysis for the 15 km stretch of water and then plan the measures.