سخنرانی کلیدی دوم
Dr. Christian Korndoerfer
„Challenges and Solutions of Municipal Water Supply System in Dresden/Germany“
Dr. Christian Korndoerfer, Dresden
According to the principle of subsidiarity in German constitution the supply of the citizen and enterprises with potable water is one of the public services the municipalities have to provide. The transformation of the state operated water supply of socialist time before 1990 to a municipal one was a big challenge for the City of Dresden. Now the water supply is managed in high quality by municipal company DREWAG. The transformation concerned not only the takeover of the pre-existing facilities for water extraction, collection and distribution but the design and realization of a water supply system that can fulfil the ecological and hygienic standards now and in future with an acceptable water price. The system is based on three columns: ground water, river bank filtrate and import of surface water from basins. Due to contamination by former careless industrial use of hazardous substances the city administration has started ambitious remediation program of soil and aquifer. It took more than 2 decades to achieve good quality of raw water again. In the late eighties the water consumption exceeded natural water regeneration. This gap was closed rapidly, mainly by the water saving effect of metering and prizing water consumption and by reduction of non-revenue water losses. The ongoing climate change more frequently will provoke drought periods and flood events, both affecting water extraction and water quality. The response on this challenges is the establishment of complete redundancy in case of failure of one of the three waterworks, the planning and safeguarding of an additional protection zone for the extraction of bank filtrate and the steady improvement of water cleaning techniques. The increasing deficit in precipitation observed for the last four years is calling for further development of water saving and water storing techniques. The responsible experts of DREWAG and water authority are interested in steady exchange of experiences, knowledge and ideas according to Habitat-3-Agreement to fulfil the sustainable development goals.