Stormwater Management
DocumentsDate added
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.
Authors
Kwabena Osei,
Author
Mr Alex Stephenson
Abstract
A novel integrated system providing hard engineered solutions to SuDS, Source Control and Rainwater re-use is described. The system is made up of four key facets; a flow control / attenuation element (Hydro-Brake
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
Authors
D.S. Jarman, M.G. Faram, D. Butler, G. Tabor, V.R. Stovin, D. Burt and E. Throp
Abstract
Computational Fluid Dynamics (CFD) can be applied to gain insights into most fluid processes and associated phenomena and so presents potential to add value in the analysis of urban drainage systems. This paper presents a review of CFD studies carried out in this field, with the objective of developing an appreciation of how and where it can be applied. Existing work has tended to focus around the analysis of four types of urban drainage structure, including Combined Sewer Overflows (CSOs), storage and attenuation systems, stormwater sediment interceptors and sewerage conveyance structures. Within the respective studies, the prediction of flowfields, particulate behaviour, water surface profiles and Residence Time Distributions (RTDs) are found to form the main focus, and as such, these are considered in most detail in the paper. It is concluded that CFD presents a number of opportunities in urban drainage system analysis, and that the scope of this opportunity will further develop as both computational hardware and software resources become more advanced.
