11 Lane Cove River 5
Water Quality Ranking: 20 / 43
Data Reliability Ranking:
1/ 43Constituent Council(s):Ku-ring-gai Municipal Council
Constituent stream(s):Lane Cove River
Rainfall Station(s):R07
Sewerage Overflows: unknown
Stormwater outlets: 13
Water Quality sampling points: WQ039, WQ041
Pollution Control Device Numbers: D005
Overview:
Landuse:
|
Landuse |
Area (ha) |
% sub-catchment |
% LCR catchment |
|
Open space |
75 |
50 |
3.8 |
|
Residential |
66 |
44 |
1.4 |
|
Business |
0 |
0 |
0 |
|
Industrial |
0 |
0 |
0 |
|
Special Uses |
10 |
7 |
1.2 |
|
Special Zones |
0 |
0 |
0 |
|
Total |
151 |
100 |
1.9 |
Period of sampling records: August 1989 - July 1992 % wet days: unknown
Number of sampling occasions (N):31
Compliance of key indicators to guidelines - % of time guidelines met under all conditions.
|
Parameter |
|||||||
|
pH |
Faecal Coliforms |
% Diss. Oxygen |
Diss. Solids |
Total P |
Total N |
Ammonia |
Chl. - A |
|
100 |
50 |
75 |
100 |
0 |
25 |
0 |
50 |
Summary: Water quality in this sub-catchment is moderate. Ammonia levels indicate sewage contamination and Chl-A levels indicate that some algal growth has occurred. The high phosphorus and nitrogen levels support this. The GPT in Charles St., West Killara may be controlling the levels of dissolved solids as well as preventing litter from entering the national park.
Issues: This is a long narrow sub-catchment which is over half national park. It is therefore important to manage this area carefully to prevent further degradation of the riparian and residential fringes of this bushland.
Knowledge Gaps: No sewerage overflow information is available
Recommendations: Identify the location of sewage pollution by investigation sources of stormwater infiltration and exfiltration of sewerage pipes.