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.
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