2 Coups Creek
Water Quality Ranking: 15 / 43
Data Reliability Ranking:
14 / 43Constituent Council(s):Ku-ring-gai Municipal Council, Hornsby Shire Council
Constituent stream(s):Coups Creek
Rainfall Station(s):R06
Sewerage Overflows: 3
Stormwater outlets: 6
Water Quality sampling points: WQ017, WQ060
Pollution Control Device Numbers: D020
Overview:
Landuse:
|
Landuse |
Area (ha) |
% sub-catchment |
% LCR catchment |
|
Open space |
21 |
11 |
1.1 |
|
Residential |
134 |
67 |
2.8 |
|
Business |
0 |
0 |
0 |
|
Industrial |
0 |
0 |
0 |
|
Special Uses |
34 |
17 |
4.0 |
|
Special Zones |
11 |
6 |
5.1 |
|
Total |
200 |
100 |
2.5 |
Period of sampling records: August 1989 - April 1996 % wet days: 10
Number of sampling occasions (N):8
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 |
|
78 |
7 |
19 |
100 |
19 |
5 |
3 |
0 |
Summary: Sewage overflows are an obvious problem in this sub-catchment and high levels of nutrients and low DO indicate possible eutrophication. The low percentage of wet days suggests dry weather leakage and exfiltration may be a problem.
Issues: This sub-catchment is another branch of the headwaters and so base information is crucial. High levels of sewage contamination in these upper reaches will increase the difficulty of detecting problems downstream.
Knowledge Gaps: At the time of printing, Ku-ring-gai Municipal Council was still undertaking an audit of stormwater outlets in this sub-catchment. This information may become available in the near future.
Recommendations: A stream remediation program is proposed for 1999 / 00. It is recommended that this project be carried out. Obtain stormwater outlet information when available.