Abstract
A prime concern in this field is the effect on long drainage systems — and consequently on their design — of attenuation in the flow through the system, which may be aggravated by the trend towards water conservation in appliances. Joint research at Brunei University, UK, and the US National Bureau of Standards, backed by experimental observation rigs, has helped to evolve a predictive mathematical model, based on the method of characteristics, which offers solutions to equations for conditions of unsteady, partially-filled pipeflows. John Swaffield and Sarah Bridge are with the Drainage Research Group at Brunel. Lawrence Galowin (see article on plumbing vent systems) is with the Centre for Building Technology, US National Bureau of Standards.
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