Assessing Infiltration and Exfiltration on the Performance of Urban Sewer Systems









Emschergenossenschaft (EG), Essen (Germany)

The Emschergenossenschaft is a self-governed joining of all users of water - mainly industry and communities - in the natural catchment of the river Emscher, Germany, a tributary of the river Rhine between Cologne and the Netherlands. Founded in 1899 the Emschergenossenschaft is the first German river catchment association -serving as a model for further German and international foundations of river associations thereafter. The foundation of the association was necessitated by unbearable hydraulic and hygienic conditions whose subsequent and basic elimination was the distinctive precondition for the development of the strongest industrial region in Germany.

After a steep rise and several phases of change, the Emschergenossenschaft is today confronted with similar challenges than those in the beginning. The complete redesign of the system of water courses and mains as well as the extension of waste water treatment in the Emscher catchment - with a budget of more than 8 billion DEM to be spent in 30 years - is one of the biggest projects in Europe. It will be a substantial contribution for further modernisation of this most densely populated area in Germany. At the same time the Emschergenossenschaft proves its qualification as a national and international competitive enterprise. Main emphasis is put on the change to commercial accountancy, the introduction of benchmarking in the field of wastewater, and the building of strategic alliances with other strong enterprises. The far-reaching inner change of our organisation is accompanied by an organisational rearrangement, making the Emschergenossenschaft a capable part of the growing market whose regional boundaries are disappearing.

Emschergenossenschaft is led in personal union with Lippeverband. Both are responsible for the catchments of two tributaries of the river Rhine, covering more than 4.000 kmē in total. For almost 10 million inhabitants and population equivalents a system of more than 70 waste water treatment plants, 150 pumping stations, numerous storm water retention tanks and a monitoring system including several laboratories for 694 river-kilometres and groundwater is held in operation. For all intense water uses and for a balance with the ecological requirements a systematic river catchment management approach is carried out on a base of long-term experience.



Dr. Torsten Frehmann
Kronprinzenstrasse 24
45128 Essen
Tel: + 49 201 104 26 37
Fax: + 49 201 104 28 00