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(358) Scenario assessment for urban water management as decision support. Grangler, Andreas1, Nickel, Darla1, Enders, Reiner1, Jekel, Martin1, 1 ABSTRACT- Keeping in mind the model of sustainability, urban water management should consider a lot of goals or problems. For this purpose, a decision-support system based on the model of sustainability is being developed. One element of the framework focuses on the environmental effects related to the technical water infrastructure. It is based on energy and substance flow analyses along the urban water pathway and involves local effects (e.g. surface waters) as well as potential environmental impacts to regional or global problems. The results are aggregated up to a set of so called "sustainability indicators", which differ partly from typical impact category indicators used in lca. To test the approach, the current status of the urban water management of Berlin was determined (Monitoring) and water management scenarios were prognosed and compared. The different scenarios for the urban water management reached from the implementation of microfiltration steps for the treatment of tertiary effluents in order to improve the quality of local surface waters up to a concept for source separation of excrements and agricultural reuse. First results show that current CO2-Emissions for water supply and wastewater disposal range about 80 kg/capita*year. The implementation of microfiltration steps would lead to an increase of 12 %. The alternative sanitary concept would also lead to slightly higher CO2 emissions compared with the current state. Substance flows with a more local relevance could be reduced significantly in all scenarios, but the recycling-rate of nutrients would be highest with a source separation concept. The framework will be completed by appropriate economic indicators and the adaptation of a multicriterial decision-support instrument including a weighting step. Key words: sustainability indicators, substance flow analyses, water management, decision support |
