15 Swaines Creek
Water Quality Ranking: 34 / 43
Data Reliability Ranking:
35 / 43Constituent Council(s):Willoughby City Council, Lane Cove Council
Constituent stream(s):Swaines Creek
Rainfall Station(s)R09
Sewerage Overflows: 2
Stormwater outlets: 37
Water Quality sampling points: WQ026, WQ027, WQ034
Pollution Control Device Numbers: D018
Overview:
Landuse:
|
Landuse |
Area (ha) |
% sub-catchment |
% LCR catchment |
|
Open space |
72 |
52 |
3.6 |
|
Residential |
56 |
40 |
1.2 |
|
Business |
2 |
1 |
1.5 |
|
Industrial |
1 |
1 |
0.5 |
|
Special Uses |
7.5 |
5 |
0.9 |
|
Special Zones |
0.5 |
0 |
0.2 |
|
Total |
139 |
100 |
1.7 |
Period of sampling records: December 1996, March 1998 % wet days: unknown
Number of sampling occasions (N): 4
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 |
|
75 |
67 |
25 |
50 |
0 |
50 |
no test |
no test |
Summary: Water quality in this sub-catchment is poor. Swaines creek is largely urbanised, contains Chatswood golf course, bowling greens and a number of ovals and playing fields.
Issues: This area of the catchment is quite old and sewerage infrastructure is failing. Large trees penetrate and choke sewerage lines with their roots and the pipes crack and leak. There is little flow in the stream and so stagnation can occur, reducing the DO levels.
Knowledge Gaps: More information regarding exfiltration and other sewerage overflows is required. The effectiveness of PCDs is unknown.
Recommendations: Creek treatments such as that in Ferndale park need to be assessed for their effectiveness. If they are deemed to be successful, more devices need to be installed. A rapid improvement would be achieved if the sewerage system were expanded to allow for greater volumes and relined to reduce leakage.