4 Fox Valley Creek
Water Quality Ranking: 14 / 43
Data Reliability Ranking:
23 / 43Constituent Council(s):Ku-ring-gai Municipal Councils
Constituent stream(s):Fox Valley Creek
Rainfall Station(s):R06
Sewerage Overflows: 6
Stormwater outlets: 71
Water Quality sampling points: WQ013, WQ058
Pollution Control Device Numbers: D004, D008
Overview:
Landuse:
|
Landuse |
Area (ha) |
% sub-catchment |
% LCR catchment |
|
Open space |
116 |
35 |
5.8 |
|
Residential |
184 |
55 |
3.9 |
|
Business |
2 |
1 |
1.5 |
|
Industrial |
0 |
0 |
0 |
|
Special Uses |
8.5 |
3 |
1 |
|
Special Zones |
24 |
7 |
11.2 |
|
Total |
335 |
100 |
4.0 |
Period of sampling records: August 1989 - September 1996 % wet days: 23.3
Number of sampling occasions (N):33
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 |
|
94 |
19 |
26 |
100 |
23 |
100 |
3 |
0 |
Summary: The combination of low DO, high faecal coliforms and high ammonia indicate a high degree of pollution from sewage. The sub-catchment has a number of ridge top playing fields which may be contributors of phosphorus. The good compliance of total nitrogen is due to only one sample being taken. The sediment basin in Sir Robert Menzies Park may be responsible for the high compliance of dissolved solids.
Issues: A large tract of land is reserved for a county road in this sub-catchment, however it is unlikely to proceed given the close proximity to Lane Cove National Park.
Knowledge Gaps: Exfiltration rates and information regarding which sewer overflows are active.
Recommendations: The contribution of playing fields to phosphorus and nitrogen loads and the rate of application and type of fertilisers is an area of possible investigation. This is a general comment for all fertilised areas. Follow up to determine the effectiveness of the sediment trap.