Gosford City Council Historical Water Quality Review & Analysis
Gosford City Council Historical Water Quality Review & Analysis
Gosford City Council Historical Water Quality Review & Analysis
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RESULTS OF WATER QUALITY DATA ANALYSIS 3-5<br />
3.1.1.4 Secchi Depth<br />
Secchi depth is a measure of the amount of light penetration through the water column, and is similar<br />
to turbidity in this regard. The annual medians for secchi depth are shown in Table 3.7. Data<br />
collection of secchi depth was terminated in September 2000, after only 15 months of monitoring.<br />
Therefore, interpretation of the results is limited, and no recent quarterly values are available.<br />
The annual data shows that significant improvements in secchi depth occurred between 1999 / 2000<br />
and 2000/2001 at Erina Ck, Woy Woy Ck, Wamberal Lagoons and Terrigal Lagoon. The accuracy<br />
of this trend is questionable, however, due to the limited data set within the later period.<br />
Table 3.7<br />
Annual Medians for Secchi Depth<br />
Secchi Depth (metres)<br />
Site No. and Location 2001/ 2002 2000/ 2001 1999/ 2000<br />
n=0 n=3 n=8 Trend<br />
Site : 77 - Booker Bay - 2.02 2.02 <br />
Site : 78 - Narara Creek Entrance - 1.45 1.44 <br />
Site : 79 - Erina Creek Entrance - 1.50 0.90 <br />
Site : 80 - Kincumber Creek Entrance - 0.90 0.70 <br />
Site : 81 - Cockle Creek - 1.95 1.73 <br />
Site : 82 - Woy Woy Creek - 2.00 1.00 <br />
Site : 83 - Wamberal Lagoon - 2.00 1.25 <br />
Site : 84 - Terrigal Lagoon - 1.80 0.66 <br />
Site : 85 - Avoca Lagoon - 2.00 2.23 <br />
Site : 86 - Cockrone Lagoon - 2.50 2.20 <br />
Average Rainfall at <strong>Gosford</strong> 1248mm 1038mm 1228mm<br />
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