Characterisation of surface water runoff from an urban
residential sewer separation scheme Dave Morgan, Paul Johnston and
Laurence Gill Trinity College Dublin Phil Collins HRD Technologies
Ltd Kwabena Osei Hydro International [email protected] Department of
Civil, Structural & Environmental Engineering Trinity College
Dublin
Slide 2
MotivationCatchment Introduction Considerable research
conducted on source-area or end of pipe solids characterisation and
modelling..... but SS prediction still a challenging proposition
Can the consideration of a system mass balance: -Improve prediction
of suspended solids and associated pollutants in the runoff -Inform
SuDS retrofit MbMb M sew MgMg M hs M out M wo M wo = M g + M sew +
M hs + M out Methodology -Field monitoring of small urban
residential catchment (18 months) -Characterisation of sediment
(loadings / PSD / TP / Cu / Pb / Zn) -Modelling of the suspended
solids RG HDVS Separate Pipe and Gully System
Slide 3
Project OutlineCatchment Introduction River Poddle 225 450 225
Stormwater sampling
Conclusions Gullies ineffective in trapping < 200 m
particles 2 4 times higher annual pollutant load in SS compared to
gully sediments High uncertainty in source loading rates modelling
of SS washoff required to determine mass balance Thanks for
listening.... Current work Modelling of suspended solids at the
outlet Partitioning of easily eroded and stable solids
fractions