16 Stringybark Creek
Water Quality Ranking: 35 / 43
Data Reliability Ranking:
32 / 43Constituent Council(s):Willoughby City Council, Lane Cove Council
Constituent stream(s):Stringybark Creek
Rainfall Station(s):R10
Sewerage Overflows: 1
Stormwater outlets: 48
Water Quality sampling points: WQ007
Pollution Control Device Numbers: none
Overview:
Landuse:
|
Landuse |
Area (ha) |
% sub-catchment |
% LCR catchment |
|
Open space |
29 |
26 |
1..5 |
|
Residential |
57 |
51 |
1.2 |
|
Business |
1.5 |
1 |
1.2 |
|
Industrial |
15 |
14 |
7.4 |
|
Special Uses |
5.5 |
5 |
0.7 |
|
Special Zones |
3 |
3 |
1.4 |
|
Total |
111 |
100 |
1.4 |
Period of sampling records: August 1989 - March 1998 % wet days: unknown
Number of sampling occasions (N):6
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 |
29 |
100 |
67 |
0 |
100 |
no test |
no test |
Summary: Water quality in this sub-catchment is poor. This sub-catchment shares the same problems of ageing infrastructure and under capacity that other sub-catchments in this area do, so faecal coliform counts are high.
Issues: The main issues in this sub-catchment relate to sewage overflows. As described the system is undersized and dilapidated causing an increasing number of overflows which are reducing water quality. Lane Cove Council has anecdotal evidence of a contaminated site at the mouth of Stringybark Creek.
Knowledge Gaps: SWC plans show only 1 designed overflow in the sub-catchment. It is clear that other overflows are occurring and should be located and remedied.
Recommendations: An audit of sewer overflows should be conducted. This would be made easy given access to SWC records.
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