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Stormwater Management

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file icon Real Life Solutions to SUDShot! 04/20/2005
Authors
Alex Stephenson
Abstract
A novel integrated system providing ‘hard’ or engineered solutions to SUDS, Source Control and Rainwater re-use is described. The system is made up of several facets; a stormwater storage element (Stormcell
file icon Approaches to Urban Drainage Systems Management for the 21st Centuryhot! 05/18/2005
Authors
R.Y.G. Andoh, A.J. Stephenson and P. Collins
Abstract
The need for a more holistic approach in the development of solutions to wet-weather induced problems in urban drainage systems is advocated. A review of current approaches to resolving problems of premature overflows and flooding is presented outlining a case example of the successful application of non-conventional approaches, techniques and devices that assist in the better management and control of wet-weather flow sources. This involves the seeking of solutions within the upstream portions of drainage systems by intercepting, containing, controlling and treating excess wet-weather flows before they cause hydraulic and water quality problems in downstream areas (sections of the drainage system). These approaches have been found to be more cost-effective than conventional solutions and involve the implementation of distributed/decentralised schemes which in turn offer improved opportunities for wider community and other stakeholder involvement leading to the realisation of amenity and other non-structural benefits.
file icon Best Practice Approaches to the Management of Sediments in hot! 06/21/2005
Authors
Michael G. Faram, Rafid M. Alkhaddar, David A. Phipps and Ian Guymer
Abstract
The successful operation of any drainage system will depend upon its correct design and implementation. In relation to SUDS (Sustainable (Urban) Drainage Systems) design, published guidance highlights the importance of managing sediments, citing inadequate management as being one of the main causes of early failure. However, this is often discussed primarily, and in most cases, exclusively, in relation to ‘soft’ SUDS approaches. The paper develops the theme of sediment management in SUDS further, applying it specifically to ‘engineered’ or ‘hard’ approaches. Focusing on the example of an ‘engineered’ storage facility, it is concluded that an optimal system will incorporate designedin sediment/debris transfer facilities, feeding on to well-designed flow control and sediment/debris interception facilities.
file icon Innovative approaches to urban stormwater managementhot! 08/24/2005
Authors
M.G. Faram, R.Y.G. Andoh and C.A. Williams
Abstract
‘Engineered’ or ‘hard’ structure based SuDS (Sustainable (Urban) Drainage Systems) have become popular in recent years, presenting further options to the drainage engineer beyond some of the more conventional approaches. However, as with any approach, correct design practice must be applied if systems are to be effective and maintainable.

Robust management of sediments is a prerequisite for the successful operation of any drainage system. If not adequately managed, sediments will accumulate in undesirable locations, making maintenance difficult, and will pass on to receiving watercourses, presenting a pollution threat.

The paper considers best practice in the design and linking together of ‘hard’ SuDS components, specifically storage systems and sediment interceptors. It is concluded, based on the outputs of recent studies, that an optimal system will incorporate a storage chamber with designed-in sediment transfer facilities, feeding onward to well-designed flow control and sediment capture facilities.

file icon PROTOCOL FOR ASSESSING SEDIMENT RETENTION IN STORMWATER TREATMENT CHAMBERShot! 07/26/2006
Authors
Kwabena Osei, Robert Andoh and Lisa Glennon
Abstract
In approving stormwater BMPs, regulators usually review sediment removal data as the basis for their decisions. One factor that is usually overlooked is the ability of a treatment device to retain captured material in the event of high flow rates. Lately, some agencies are requiring vendors to indicate washout prevention of their stormwater treatment systems. However, no standard protocol exists that measures how much of previously captured pollutant is resuspended and carried downstream of the treatment device during high flows.

This paper discusses an effective test protocol for evaluating the sediment retention efficiency of proprietary stormwater treatment systems. The sump of a full-scale treatment device is filled with a known mass of sediment or sediment tracer. The unit is run at steady-state for a specified duration that exceeds several multiples of its effective detention time. Repeated tests are undertaken at different flow rates and the amount of material retained in the device for each flow rate is determined. The sediment retention efficiency is then calculated based on a comparison between mass of material retained in the sump after running flows through the unit and the original mass of material deposited in the sump.

Test data using this protocol for different device configurations are discussed and this highlights the importance of chamber geometry and hydrodynamic regime on the sediment retention efficacy of stormwater treatment devices.

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