This paper describes a study programme underway in the upper Perth Roa
d catchment in Dundee to estimate the effect of gross solids and their
interaction with the sediment found within a combined sewer network.
Gross solids have been collected at three different sites in the study
catchment, near its head, at the catchment outfall and at an intermed
iate site. In conjunction with the study of gross solids, sewer sedime
nt samples were collected and analysed to determine both their chemica
l and physical characteristics. The study also includes flow sampling
(both dry and storm) and gully discharge monitoring. The pool of pollu
tants information thus collected includes surface derived, foul flow a
nd gross solids pollutant characteristics. The objective of the study
programme is to analyse the contribution made from the various inputs
and to produce a budget of pollutants within the study sewer system. A
description of the field and laboratory work undertaken in the study
is described, together with a preliminary assessment of the pollutants
budget technique. Copyright (C) 1996 IAWQ. Published by Elsevier Scie
nce Ltd.