14 In times of increasing global water shortage careful handling of water as a resource is another special con cern of Messe Stuttgart State of the art and the most water effi cient technology was therefore used during the construction of the new trade fair centre Water heating was centralised at two key points on the trade fair grounds with the result that both water con sumption and energy consumption have been reduced The supply quantity was therefore ideally designed so that no surplus water is heated unnecessarily Water saving and self closing taps are installed on every wash basin Their self closing valves ensure an effi cient combination of the fl ow rate and the jet duration The sanitary facil ities in the visitor areas each only have one tap for hot water This tap is operated by means of a continuous fl ow heater instead of a heat accumulator thereby saving unnecessary heating energy Compared with the old trade fair centre the volume of the toilet cisterns was reduced from 9 to 6 litres in the new complex With 1 35 million visitors a year and one estimated fl ushing process per day this leads to annual water savings of at least 4 05 million litres This corresponds to the annual consumption of at least 90 persons Since the fl ushing mechanisms in the toilets were changed from manual to automatic water con sumption has also been reduced The building cleaning service partner is certifi ed accor ding to DIN ISO 9001 and 14001 i e both for quality management and environmental management and uses environmentally friendly cleaning agents and ma terials This helps to reduce the amount of waste water Messe Stuttgart has three retention basins with a total The water cascades capacity approx 2 million litres in the trade fair centre park 4 05 million Annual water savings of litres

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