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The Greater London Council, the UK Office of Water Services (OFWAT), the UK Department for Environment, Food, and Rural Affairs (DEFRA), the Environment Agency of England and Wales, and the Thames Water Utility (TWU), are working together to improve the water quality of the River Thames Tideway. A key element of this strategy is the improvement of the quality of storm flows from the large London CSOs that discharge into the tideway. TWU is tasked with developing the strategy for dealing with these CSOs. To do so, more data is required relating to the nature and volume of the storm flows in the Trunk Sewers and Storm Sewers in London. TWU commissioned a long term sewer flow survey to provide the necessary data required for the strategy.

Critical objectives of the survey are:

Obtain continuous flow data at each survey site with +/− 2% accuracy

Use these data to extend and verify the existing catchment models

Combined use of monitored flow data and modelling to assess storage and screening options for the design requirements of the CSOs discharging to the River Thames

The project is extremely ambitious. The key to obtaining good data for this wide range of parameters is accuracy under a wide range of hydraulic conditions. Varying performance will increase the variation in modelling results. To this end, it is essential that the operator understands the technology and capability of the instrumentation to be used. TWU selected the ADFM Velocity Profiler (ADFM) from MGD Technologies Inc. (MGD) for use upon this project for very specific reasons.

Prior to this project, there was not sufficient instrumentation within the trunk sewer system for TWU to measure the dynamics of the sewerage system in extended rainfall conditions. The Thames Tideway Strategy provided the opportunity to install instrumentation in response to environmental objectives and to establish a network of operational flow instruments for the future. The long term flow monitoring is leading to a more detailed understanding of the sewer's hydraulic performance than is possible from hydraulic modelling alone. An additional benefit is that the sites can be converted to real-time output, allowing for real-time management of the sewerage system.
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Document Type: Research Article

Publication date: 2003-01-01

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