Two research projects identified the need for a new design guide and software to facilitate the design of combined sewer overflows. The purpose of the design guide and software is to enable the selection of the most cost effective arrangement of overflow and screens according to local circumstances. Strategies were developed to minimise the risk of those testing the design guide and software. Tests took place on a number of projects, one of which is the subject of an ongoing pre and post construction appraisal. The experience gained from the test projects is being fed back into the software development.

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