Affiliations: Department of Environmental Science, Faculty of
Science, Royal University of Phnom Penh Russian Federation Blvd., Cambodia | Department of Geography and Planning; and Center for
Southeast Asia Environment and Sustainable Development Buffalo State, State
University of New York, Buffalo, NY, USA 14222 | Department of Civil, Structural, and Environmental
Engineering, University at Buffalo, Buffalo, NY 14260
Abstract: A version of the Stormwater Management Model (PCSWMM.NET) was
applied to the sewer system of central and south Phnom Penh to model storm
event flows. This section of the city is serviced by two main open sewer
channels, Trabek and Meanchey, and the surface drainage area for these two
channels was divided into 52 sewersheds for modelling purposes. A small (27
mm), medium (76.6 mm, the most representative storm) and large (392 mm, the
worst case) storm event was modelled. Model calibration was done through
observation of surface flooding locations and velocity measurements in the main
sewer channels during the large storm. The model tended to under-predict mean
velocity, but at a planning level seems to provide reasonable flow estimates.
Storm event contaminant loadings were estimated for the large storm and Cu and
Cr loadings were less than, but of the same magnitude, as an entire month of
dry weather discharge. The model needs to be further refined by considering
certain sewer flow diversions, pumping operations, and linking it to a wetlands model.
