Constituent Council(s):Ku-ring-gai Municipal Council

Constituent stream(s):Lane Cove River

Rainfall Station(s):R05

Sewerage Overflows: 3

Stormwater outlets: 29

Water Quality sampling points: WQ029, WQ053, WQ057, WQ058

Pollution Control Device Numbers: none

Overview:

Landuse:

Period of sampling records: August 1989 - March 1998 % wet days: unknown

Number of sampling occasions (N):14

Compliance of key indicators to guidelines - % of time guidelines met under all conditions.

Summary: Water quality in this sub-catchment is moderate with evidence of sewage pollution. This sub-catchment contains Brown’s waterhole, the confluence of Lane Cove River and Terrys Creek. A large proportion of Terrys Creek flows through urbanised Ryde and Parramatta councils and is likely to be heavily polluted.

Issues: This is an important sub-catchment because it encompasses the confluence of Lane Cove River with both Devlins and Terrys Creeks. Assessing the water quality of each of these creeks just before and after they enter LCR allows the whole of the creek to be assessed relative to the river which can be used to manage the entire creek.

Knowledge Gaps: Browns waterhole has been extensively monitored because it is a useful point at which to assess the contributions of both Terrys Creek and Lane Cove River(similarly with Devlins Creek confluence upstream). A widespread recognition of this value has seen every interest group monitor at a different point. A set of standard points is required.

Recommendations: A specific comparison of sites WQ053 (upstream) and WQ057 (downstream) would provide a useful indication of the overall contribution of Terrys Creek to the water quality of Lane Cove River. A similar strategy for the confluence of LCR and Devlins Creek further upstream would also be useful.