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Stormwater Management

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file icon Weedon Flood Storage Scheme - the Biggest Hydro-Brake in the Worldhot! 03/17/2004
Authors
G P BOAKES, A STEPHENSON, J B LOWES, A C MORISON, A T USBORNE
Abstract
The Northamptonshire villages around Weedon in the upper River Nene valley, suffered disastrous flooding in 1947, 1992 and 1998, with Weedon Bec being particularly badly affected. The channel through the village is constricted by historic developments and the opportunity to enlarge the channels was not available. Restricted culverts under the railway embankments downstream compounded the flood situation.

To alleviate the problem the Environment Agency and Halcrow Group developed an upstream on-line storage reservoir scheme. The project includes a 450m long, 6.8m high clay embankment across the valley, with a culvert on the line of the original river channel to carry the controlled outflow. A 150m long concrete-block spillway carries excess flood flows over the embankment. The embankment site has been landscaped to minimise visual impacts and the borrow area has been developed into a large wetland area as a habitat for aquatic flora and fauna.

The key component of the flow control system is a 6.5 tonne, stainless steel Hydro-Brake

file icon VERIFICATION OF THE UP-FLOhot! 07/26/2006
Authors
Lisa Glennon, Robert Andoh, Uday Khambhammettu, Robert Pitt, and Shirley Clark
Abstract
Drainage areas such as parking lots, vehicle fueling and maintenance stations, and public works storage areas have been dubbed critical source areas due to the observation that runoff from these areas may contain high pollutant loadings of varying pollutant classifications, including trash and other debris, coarse and fine sediment, hydrocarbons, toxic trace metals, nutrients, pathogens, and/or other toxicants. Typically, various types of treatment are needed to target the different classifications of pollutants for effective stormwater treatment. The Up-Flo™ Filter, a new stormwater treatment technology developed under the EPA’s SBIR program, has been designed to treat different classifications of stormwater pollutants by incorporating multiple elements of a treatment train into a single device. The Up-Flo™ Filter with CPZ Mix™ media has undergone a full-scale field evaluation at a site near the City Hall in Tuscaloosa, AL.
This paper presents results of a comprehensive characterization and performance verification of a full-scale Up-Flo™ Filter unit tested under controlled laboratory conditions at Hydro International’s facility in Portland, ME, and compares the results to the field data collected by the University of Alabama. Further verification work is currently underway at the Pennsylvania State Univeristy in Harrisburg, Pennsylvania.
The Up-Flo™ Filter with CPZ Mix™ media is shown to be a high-rate filtration device with a relatively high filtration rate per unit surface area of the filtration media. The Up-Flo™ Filter is also capable of TSS removal down to 0.45 – 3 μm range.
file icon UrbanWaterManagement: Innovations and Paradigm Shifts to Address 21st Century Needshot! 05/16/2008
Authors
Robert Y.G. Andoh,Michael G. Faram and Kwabena Osei
Abstract
Globally, the water and wastewater industry faces major challenges, both in developed and developing world regions. The developed world has enjoyed the benefits of the foresight of prior generations, with major strides gained in public health simply from innovations such as the humble sewer which has contributed more to human health than all developments in the medical field. Challenges faced in different regions are diverse in nature, magnitude and scale. Some are local in nature but others such as the impacts of Climate Change are truly global. The paper examines the status and evolution of innovations within urban water management (with particular reference to stormwater management) including impacts of regulation, barriers to innovation, current trends and paradigms. It is argued that there is a need to change the way we approach urban water management challenges, particular if the goal is to achieve more sustainable development in an increasingly urbanizing world.
file icon Treatment of urban run-off using innovative below-ground separation and filtration technologieshot! 09/04/2007
Authors
M.G. Faram, R.Y.G.Andoh
Abstract
The current climate of interest in water-environmental issues and the drive towards ‘sustainable’ practice presents significant technical challenges. In the urban water management arena, while the emphasis in the UK and Europe in recent years has been on implementing ‘best practice’ solutions at the ‘new development’ level, a greater challenge will be in addressing the situation in existing urban infrastructure. The paper discusses the role of below-ground stormwater separation and filtration systems, covering their form, operation and verification. Through reference to a number of evaluation studies, it is demonstrated that these systems can be robust and effective, and can play a role in stormwater quality management, whether used in conjunction with other ‘hard engineered’ structures or with ‘soft’ structures such as ponds. They offer particular opportunities in highly urbanised catchments where space availability is a constraint, or where economic considerations preclude the use of less space-efficient options.
file icon Storm Water Best Management Practices into the Existing Urban Landscapehot! 05/16/2008

Authors: Ed Loffill, David Phipps, Rafid Alkhaddar, Robert Andoh and Mike Faram

Abstract: The operation of an ‘advanced’ hydrodynamic vortex separator (AVS) designed for stormwater sediment interception has been examined using particle capture and retention efficiency testing and dye tracer testing. For retention efficiency in particular (referring to the efficiency with which a chamber retains pollutants following capture) the results are compared with those for other configurations, including simple vortex and gravity separation devices. The results show how the collection and retention efficiencies of the AVS are enhanced through the presence of a quiescent zone in the base where solids are stored. A simple model of system operation is considered, based on the surface loading rate of the active region and the particle sedimentation velocity. It is concluded that a comprehensive model of system performance needs to take into account a variety of factors, including the detailed characteristics of the sediment material and the hydrodynamic characteristics of the specific separation device in question.

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