undertakers, contractors and other organisations involved in the provision or maintenance of surface water drainage to new and existing developments. 2002. Hydraulic Design of Paved Areas. M Escarameia. Report SR606. HR Wallingford, Oxon. This report describes a 28-month long study carried out by HR Wallingford which had the following objectives: - To determine acceptable design criteria for the design of drainage systems for large paved areas. These include maximum acceptable water depth and duration of ponding for the design storms. -To develop a suitable design procedure. -To promote adoption of the design procedure. Design guidance was produced for 2-dimensional catchment lengths from 10 to 100m and slopes from 1/150 to 1/50, as these values constitute an envelope of the conditions for which paved areas are likely to be designed. In order to achieve the above objectives the study was divided into the following stages: (1) development of a numerical programme for calculation of water depths on pavements; (2) collection of site data to provide suitable resistance equations and enable the validation of the numerical programme; and (3) development of design guidance. 2007. BRESOAK: Soakaway Design Software. AP241. Building Research Establishment, Garston, Watford, Herts. The BRESOAK software supports the 1991 DG365 handbook (see above) and will help soakaway designers plan in ways that are consistent with the advice given in BRE Digest 365 on design and construction procedures, and specifically the calculation of rainfall design values and soil infiltration rates. The digest (DG365) is also included as a pdf file on the CD ROM. The software runs on Windows (TM). A.3.1.1. Recent Relevant Research Publications 2008. R. Kellagher and H.Udale-Clarke. Sustainability Criteria for the Design of Stormwater Drainage systems for the 21st Century. In: CD of Proceedings of 11th International Conference on Urban Drainage, Scotland, UK, 31 August – 5 September 2008. Infiltration is highlighted as a new performance measure which has been mainly ignored to date. Greater emphasis is now being given to groundwater recharge and this should be added as a design criterion. Research has demonstrated that rainwater harvesting can significantly reduce the flow rate and volume of surface water runoff from a developed site and minimise the size of stormwater management control components at site and regional scales. 2008. G. Lemmen, F. Boogard, P. Schipper and R. Wentink. Maintenance of SUDS. In: CD of Proceedings of 11th International Conference on Urban Drainage, Scotland, UK, 31 August – 5 September 2008.
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