Berlin has identified two challenges due to changes in the climate, which are water scarcity due to decreasing precipitation and increasing temperatures, This will lead to a rise in treated effluent share in the city's surface wa-ter especially during summer. Another challenge is caused by extreme rain events when combined sewer (wastewater and storm water) overflows can reach urban rivers. Combined sewer overflows need to be limited to protect the surface water quality in Berlin. The demonstrations concern the management of substance flows with-in the water cycle under climate change conditions, especially because drinking water in Berlin relies on natural water treatment methods as bank infiltration and artificial groundwater recharge near the city's many rivers and lakes. A second demonstration concerns the planning of integrated and recipient/impact based combined sewer overflow control under conditions of climate change. Smart well field management will continue to allow natural drinking water treatment for the future, with significant savings on naturally recharged groundwater. The model-ling of the impact of different combined sewer overflow management options will ascertain that the investments planned for the next five years can be focussed on measures that bring maximum benefit.
Demonstration managers: Regina Gnirß and Andreas Matzinger Website: http://www.bwb.de.