South Creek Subcatchment
The South Creek subcatchment encompasses most of the Cumberland Plain of Western Sydney.
The catchment is a shale-based catchment with no gorges or sandstone dominated landscapes. The majority of the streams are "meandering vertical" river channel types streams, which are under great threat as they are confined largely to the Cumberland Plain in the Hawkesbury Nepean catchment.
South Creek subcatchment is perhaps the most degraded subcatchment in the Hawkesbury Nepean. Hydrological and sediment regimes have been dramatically altered due to vegetation clearance and increasing urbanisation. Increasing impervious surfaces in the catchment are causing changes to hydrology which has greatly altered the geomorphology and ecology of the watercourses. A number of major Sewerage Treatment Plants discharge into South Creek and these, along with stormwater from urban areas and agricultural run off, contribute to the poor water quality of the streams. The recovery potential of the catchment's streams is very low; however, there are some very important remnants of endangered vegetation along the riparian zones. The watercourses form extremely important habitat corridors although heavy woody weed invasion exists in the riparian zones. |
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