Constituent Council(s):Ryde City Council

Constituent stream(s):Pages Creek

Rainfall Station(s):R13, R09

Sewerage Overflows: 6

Stormwater outlets: 25

Water Quality sampling points: WQ032

Pollution Control Device Numbers: D014

Overview:

Landuse:

Period of sampling records: December 1996 to December 1998 % wet days: 0

Number of sampling occasions (N):2

Compliance of key indicators to ANZECC guidelines

Summary: Water quality in this sub-catchment is moderate. It is difficult to determine given only two dry weather samples but it indicates that the sewerage system can cope with dry weather flows. Generally more tests are required. As with many urban catchments, phosphorus and nitrogen levels are elevated and may come from Blenheim park and the landscaping of the Northern Suburbs Cemetery.

Issues: This sub-catchment has a large portion of open space, most of it being national park and is therefore very important for management purposes. This sub-catchment also contains over one fifth of the total business areas of Lane Cove catchment, and whilst this landuse would not be suspected of being a serious polluter, it has not been monitored before in the catchment.

Knowledge Gaps: Information regarding sewerage and stormwater are largely complete for the sub-catchment.

Recommendations: Some monitoring of the business areas should be conducted to determine the effect of this land use on the catchment. In addition, the impacts of pollution from the cemetery should also be monitored. The effectiveness of the mini-wetland in Plassey road should be assessed as this should be reducing the levels of nutrients entering Pages creek and Lane Cove River.