Gosford City Council Historical Water Quality Review & Analysis
Gosford City Council Historical Water Quality Review & Analysis Gosford City Council Historical Water Quality Review & Analysis
RESULTS OF WATER QUALITY DATA ANALYSIS 3-1 3 RESULTS OF WATER QUALITY DATA ANALYSIS 3.1 Contemporary Water Quality Results The most recent water quality monitoring carried out in Gosford LGA was undertaken by Assoc. Prof. Dominic Cheng of Ecoscience Technology (University of Technology, Sydney). Monitoring was carried out at ten (10) sites within Brisbane Water and the coastal lagoons, as identified in Figure 3.1. Monitoring was on a monthly basis between August 1999 and June 2002. Details of the monitoring results are found in Ecoscience Technology (2002). The general results of this monitoring program are described in the Sections below. The results have been obtained using the yearly and quarterly reporting tools of GWQ, as described in Section 2.3. Analysis is thus provided for annual comparisons for the entire dataset, and for quarterly comparisons over the last 12 month period (2001 / 2002). Median values for annual results have been reported to reflect a more ‘typical’ value within the waterways, whereas mean values are reported for the quarterly results given the lack of statistical data (i.e. generally only three records per quarter). The quarterly results are slighted skewed by the fact that the Jan – Mar 2002 period contained only one record (other quarters contained either three or four records). Therefore, care should be taken when interpreting the results. This problem highlights the importance of consistent data collection throughout the monitoring period. Figure 3.1 Sites for Most Recent (Cheng) Water Quality Monitoring Program D:\R.N0754.002.01.DOC 7/11/03 16:11
RESULTS OF WATER QUALITY DATA ANALYSIS 3-2 3.1.1 Physical Parameters 3.1.1.1 Temperature Median annual temperatures for the Gosford waterways are presented in Table 3.1, while mean quarterly temperatures are presented in Table 3.2. The annual results show typically warmer temperatures in 1999/2000 compared to the other two years. This would be due to the summer biasing of the 9 records that were collected during that year. Given the natural variability in temperature, no definitive temporal trend was identified. On a quarterly basis, the results show a distinctive change associated with seasonal variations of ambient air temperature. However, there was not a significant difference in mean temperature between the Apr – Jun 2002 period and the previous Apr – Jun 2001 period, with most results within +/- 1°C. Table 3.1 Annual Medians for Temperature Temperature (Degrees C) Site No. and Location 2001/ 2002 2000/ 2001 1999/ 2000 n=11 n=12 n=9 Trend Site : 77 - Booker Bay 20.2 17.0 19.9 Site : 78 - Narara Creek Entrance 19.6 18.0 22.0 Site : 79 - Erina Creek Entrance 19.6 18.5 21.3 Site : 80 - Kincumber Creek Entrance 18.3 18.4 22.0 Site : 81 - Cockle Creek 19.3 18.5 22.0 Site : 82 - Woy Woy Creek 20.0 18.0 23.0 Site : 83 - Wamberal Lagoon 18.4 15.8 23.3 Site : 84 - Terrigal Lagoon 18.6 15.1 23.3 Site : 85 - Avoca Lagoon 19.1 16.1 23.8 Site : 86 - Cockrone Lagoon 18.6 17.0 22.9 Average Rainfall at Gosford 1248mm 1038mm 1228mm Table 3.2 Quarterly Means for Temperature Temperature (Degrees C) Site No. and Location Apr - Jun Jan - Mar Oct - Dec Jul - Sep Apr - Jun 2002 2002 2001 2001 2001 n=4 n=1 n=3 n=3 n=3 Trend Site : 77 - Booker Bay 17.7 24.1 21.7 16.3 17.8 seasonal Site : 78 - Narara Creek Entrance 17.0 24.8 22.8 16.2 15.6 seasonal Site : 79 - Erina Creek Entrance 17.1 24.5 23.3 16.2 16.2 seasonal Site : 80 - Kincumber Creek Entrance 16.0 23.9 22.1 14.6 14.8 seasonal Site : 81 - Cockle Creek 17.6 24.0 22.2 16.3 19.2 seasonal Site : 82 - Woy Woy Creek 16.9 24.1 23.1 16.6 16.9 seasonal Site : 83 - Wamberal Lagoon 16.0 23.5 21.9 15.5 16.6 seasonal Site : 84 - Terrigal Lagoon 15.7 23.4 22.0 15.5 15.2 seasonal Site : 85 - Avoca Lagoon 16.2 23.9 22.8 15.4 16.3 seasonal Site : 86 - Cockrone Lagoon 15.7 24.6 22.5 15.4 14.8 seasonal Average Rainfall at Gosford 150mm 735mm 189mm 174mm 445mm D:\R.N0754.002.01.DOC 7/11/03 16:11
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- Page 3 and 4: CONTENTS I CONTENTS Contents List o
- Page 5 and 6: LIST OF FIGURES III 4.4 Outcomes fr
- Page 7 and 8: LIST OF TABLES V Table 3.23 Water Q
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- Page 11 and 12: INTRODUCTION 1-4 aquatic ecosystems
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RESULTS OF WATER QUALITY DATA ANALYSIS 3-2<br />
3.1.1 Physical Parameters<br />
3.1.1.1 Temperature<br />
Median annual temperatures for the <strong>Gosford</strong> waterways are presented in Table 3.1, while mean<br />
quarterly temperatures are presented in Table 3.2.<br />
The annual results show typically warmer temperatures in 1999/2000 compared to the other two<br />
years. This would be due to the summer biasing of the 9 records that were collected during that year.<br />
Given the natural variability in temperature, no definitive temporal trend was identified.<br />
On a quarterly basis, the results show a distinctive change associated with seasonal variations of<br />
ambient air temperature. However, there was not a significant difference in mean temperature<br />
between the Apr – Jun 2002 period and the previous Apr – Jun 2001 period, with most results within<br />
+/- 1°C.<br />
Table 3.1<br />
Annual Medians for Temperature<br />
Temperature (Degrees C)<br />
Site No. and Location 2001/ 2002 2000/ 2001 1999/ 2000<br />
n=11 n=12 n=9 Trend<br />
Site : 77 - Booker Bay 20.2 17.0 19.9 <br />
Site : 78 - Narara Creek Entrance 19.6 18.0 22.0 <br />
Site : 79 - Erina Creek Entrance 19.6 18.5 21.3 <br />
Site : 80 - Kincumber Creek Entrance 18.3 18.4 22.0 <br />
Site : 81 - Cockle Creek 19.3 18.5 22.0 <br />
Site : 82 - Woy Woy Creek 20.0 18.0 23.0 <br />
Site : 83 - Wamberal Lagoon 18.4 15.8 23.3 <br />
Site : 84 - Terrigal Lagoon 18.6 15.1 23.3 <br />
Site : 85 - Avoca Lagoon 19.1 16.1 23.8 <br />
Site : 86 - Cockrone Lagoon 18.6 17.0 22.9 <br />
Average Rainfall at <strong>Gosford</strong> 1248mm 1038mm 1228mm<br />
Table 3.2<br />
Quarterly Means for Temperature<br />
Temperature (Degrees C)<br />
Site No. and Location<br />
Apr - Jun Jan - Mar Oct - Dec Jul - Sep Apr - Jun<br />
2002 2002 2001 2001 2001<br />
n=4 n=1 n=3 n=3 n=3 Trend<br />
Site : 77 - Booker Bay 17.7 24.1 21.7 16.3 17.8 seasonal<br />
Site : 78 - Narara Creek Entrance 17.0 24.8 22.8 16.2 15.6 seasonal<br />
Site : 79 - Erina Creek Entrance 17.1 24.5 23.3 16.2 16.2 seasonal<br />
Site : 80 - Kincumber Creek Entrance 16.0 23.9 22.1 14.6 14.8 seasonal<br />
Site : 81 - Cockle Creek 17.6 24.0 22.2 16.3 19.2 seasonal<br />
Site : 82 - Woy Woy Creek 16.9 24.1 23.1 16.6 16.9 seasonal<br />
Site : 83 - Wamberal Lagoon 16.0 23.5 21.9 15.5 16.6 seasonal<br />
Site : 84 - Terrigal Lagoon 15.7 23.4 22.0 15.5 15.2 seasonal<br />
Site : 85 - Avoca Lagoon 16.2 23.9 22.8 15.4 16.3 seasonal<br />
Site : 86 - Cockrone Lagoon 15.7 24.6 22.5 15.4 14.8 seasonal<br />
Average Rainfall at <strong>Gosford</strong> 150mm 735mm 189mm 174mm 445mm<br />
D:\R.N0754.002.01.DOC 7/11/03 16:11
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