An investigation of the transport of solids in combined sewers during
both dry weather flow (DWF) periods and storms is described. The study
was based on data obtained from a number of sites in the combined sew
er system of Dundee, Scotland. The relationship between hydraulic cond
itions in a combined sewer and the transport of solids in suspension w
as examined. The aim was to arrive at a methodology by which an approp
riate model could be selected or developed which would predict solids
transport rates given information on hydraulic conditions. It was foun
d that for individual sites, site-specific regression equations could
be developed separately for dry weather and storm conditions. A non-si
te-specific regression equation was also developed, which was found to
be preferable to the site specific equations, in terms of accuracy an
d ease of use. More important, however, were the fundamental procedure
s (ie the methodology) developed by which the model type was in each c
ase selected and subsequently developed. Copyright (C) 1996 IAWQ. Publ
ished by Elsevier Science Ltd.