Messe Stuttgart Sustainability Report Position at July 2017 15 retention volume of 10 860 square metres for natural cleaning of rainwater Rainwater failing all over the trade fair grounds is directed through a pipeline system into the adjacent retention basins After a few days of the self cleaning process the rainwater seeps into the groundwater or is fed back via a stream into the natural water circuit thus relieving the pressure on the sewers and sewage treatment plants Part of the roof rainwater is used to equalise the evapo ration volume of the water cascades and water the green areas during dry spells Water Economical in consumption and good for groundwater Cross section of one of the three retention basins Additional filtering of water by reservoirs Additional filtering of water by reservoirs Overflow Absorbing waterSealing foundations Absorbing waterSeepage packing Sealing foundations Inflow Mechanical cleaning Seepage rotation Inflow Mechanical cleaning Seepage rotation Seepage rotation Seepage rotation Seepage rotation Sedimentation tank 1 Sedimentation tank 2Retention basin 1 Retention basin 2 Retention basin 3

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