ISBN: 1 84057 469 0
Published Date: 20/12/2007
Storm tanks have been an integral part of the sewage treatment process since the early 20th century, but to date however, their performance is poorly understood. The introduction of the Water Framework Directive may see the need for water companies to quantify, both in terms of flow magnitude and quality, all intermittent spills to receiving water courses. To do this it is required to better understand the pollutant retention efficiency of storm tanks. This report looks at the designs of storm tanks that are currently in use and reports on a series of field evaluations and laboratory tests which have been carried out to improve understanding of the flow regimes and the pollutant retention in the most common designs of circular and rectangular storm tanks. This data has been developed into a methodology which allows the prediction of the pollutant retention efficiency for a given design of storm tank under a range of conditions. The outputs from the research comprise a final report, a technical reference manual (07/WW/22/6) and an MS-Excel based tool - sold together as a set for £300.