Im Rahmen dieser Diplomarbeit wurde das Berliner Abwassersystem hinsichtlich einer Abflusssteuerung untersucht. Auf Grundlage des Merkblattes DWA-M 180 wurde zunächst die formale Bewertung des Steuerungspotenzials des Berliner Mischsystems durchgeführt. Weiter wurde für Niederschlagsereignisse des Jahres 2003 eine statische Bilanzierung bezüglich anfallender Wassermengen und vorhandenem Speichervolumen aufgestellt. Anhand von ausgewählten Ereignisse wurden dann für verschiedene Szenarien die Auswirkungen einer geänderten Förderstrategie untersucht. Im Vordergrund standen eine gleichmäßige Nutzung der Systemkapazitäten, die Verringerung von Mischwasserentlastungen und die Reduzierung des Mischwasserabflusses zur Kläranlage.

Since the adoption of the European Water Framework Directive of 1991, the discharges of urban rainwater have to be reduced as much as possible. This theme is very sensitive in Berlin due to its drinking water supply system. The Integrated Sewage Management (ISM) project aims to improve the sewage system management, in order to reduce discharges and cut costs. The project is based on the modelling of the different parts of the system. This should lead to a global view of the way, how the system works and the implementation of a decision help tool for the operators of the Berlin Water Societies. A general description of ISM project and Berlin is followed by a presentation of Infoworks CS™. The building and calibration of Berlin V and XII models are explained and a last part presents tests of different ways to reduce rainwater discharges.

Since the adoption of the European Water Framework Directive in 1991, the discharges of foul water into the rivers during storms have to be limited as much as possible. This issue is particularly tricky in Berlin where the drinking water resources are very sensible to pollution due to the shortness of the water cycle. The Integrated Sewage Management Project aims at improving the management of the sewage network, in order to cut costs and to reduce discharges into the environment. The project relies on the modeling of the different parts of the sewage system (sewers, pumping stations, pressure pipes and wastewater treatment plants). This should enable us to have a global view of the system and to draft various regulation scenarios according to weather conditions. In the end, we should come up with a “policy” that could easily be implemented by operators of the Berliner Wasser Betriebe. This report summarize the main steps of the work that have been conducted on the subcatchment Berlin VIII, namely the building of the network in Infoworks, the calibration of the model during dry and rain weather.

After extending the sewage networks in the 1990s, the focus is now on reducing the overflows from combined sewers in storm weather, which create serious problems (fish death, beach closure, etc.). To protect the particularly sensitive surface waters of Berlin, on whose quality the drinking water supply inderectly depends, KompetenzZentrum Wasser Berlin, on behalf of Berliner Wasserbetriebe and Veolia Water, realises the project Integrated Sewage Management. In-pipe storage of combined waters during storm weather is tested on the basis of a model of the whole sewage system. But slowing the flow causes the suspended load to sediment, thus its transport in the network has to be simulated. This report presents a short review of sediment transport in fluvial hydraulics and in urban drainage, as well as an application on a small storm water network with software InfoWorks CS 4.5.

The European Water Framework Directive of 1991, which aim is to limit the discharge of urban rainwater, constrains the cities to improve their sewerage system in order to face such events. The combined sewer overflows are a very sensitive theme in Berlin because of the city’s drink water supply system. The Integrated Sewage Management project, materialized within the Berlin Water Competence Center, aims to optimize the network thanks to hydraulic and pollution modelling. The first step of this study is to model a pilot catchment’s area, thanks to the Hydroworks DM software. Beyond the network constitution, a measurement campaign is realized to calibrate the model, for hydraulic as well as for pollution processes. This has to be done for both dry and rain weather. A first calibration is made possible by the results of dry weather measurements. The analysis of rain weather measurements will allow the validation of the model to be done, and its transposition to the other Berlin catchment’s areas.