Stormwater Management
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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.
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.
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.
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.
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
