Authors

J. P. LeCornu, M. G. Faram, D. S. Jarman, and R. Y. G. Andoh

Abstract

Urban drainage networks require accurate, reliable flow control systems for their effective operation and minimisation of flood risk. Different types of flow control produce different hydraulic characteristics, having implications to system design in particular relating to upstream storage utilisation. Vortex flow controls (VFCs) present particular opportunities, producing desirable hydraulic characteristics while also having large clearances compared to other devices. This paper describes the implementation of advanced flow control characterisation procedures and techniques allowing VFCs in particular to be characterised within a period of a few hours. The results are shown to correspond with those collected using conventional methods. Work is also described relating to the development and application of a model to allow storm hydrograph response modelling of storage-flow control combinations. It is demonstrated how the use of a VFC can lead to significantly more efficient storage utilisation compared to when a simple orifice plate is used. Further to this, it is found that system recovery times can be significantly improved, with gains of in excess of 35% being obtained. Initial verification of the simulations shows a favourable correspondence with test outputs produced by others.