Previous studies of the effects of manholes on longitudinal dispersion has concentrated on the spreading of solutes, This papers presents new data describing the influence of a surcharged and free-flowing manhole structure on the longitudinal dispersion of a fine suspended material, The effects of benching within the manhole structure are also illustrated. Laser Induced Fluorescence (LIF) techniques have been used to provide a qualitative description of the mixing processes present within a surcharged manhole, Nephelometric results have provided estimates of the parameters required to simulate the mixing effects using either increase in variance or aggregated dead zone techniques, A preliminary attempt at describing these observations using available software is discussed and recommendations for future developments are made. (C) 1998 IAWQ. Published by Elsevier Science Ltd. [References: 9]
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