Caboolture Region Water Quality Study - Moreton Bay Regional ...

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Caboolture Water Quality Study marine environment), most sites rated good for all indicators. However sites close to the mouth of the Caboolture River and the canals on the Redcliffe peninsula had elevated concentrations of nutrients and in some cases chlorophyll-a. This likely reflects their proximity to the land-sourced influences entering Deception Bay. EHMP monitoring has reported an increase in the frequency of Lyngbya blooms in Deception Bay. Overall, water quality on Bribie Island was moderate to poor, with only two sites out of sixteen rated as being in good condition (Figure 12). However, it is important to note that these assessments are based upon comparisons with water quality from natural reference waterways and because canals are man-made waterways, it may not be appropriate to expect the water quality of a natural waterway to be achievable in a canal. The major differences between the Bribie Island sites and the guideline values were low concentrations of dissolved oxygen and high concentrations of ammonia, especially in canal sites. Sites in Freshwater lagoon and Shirley Creek had high concentrations of faecal coliforms, possibly arising from the high abundance of waterbirds that use these areas and from urban run-off. Such urban influences might be expected in a man-made canal. Overall results of water quality assessments for Pumicestone Passage showed that water quality deteriorated with increasing distance from the opening of the passage to the ocean. Poor water quality ratings in the central area of the passage were due to high turbidity and poor secchi depth. Concentrations of total phosphorus were good throughout the passage, however total nitrogen concentrations were high at most sites monitored. All of these sites were close to the entrance of the Northern creeks into the passage, many of which also has high nitrogen concentrations (see below). Water quality was variable throughout the Northern Creeks. Most indicators were comparable to values for reference creeks in south-east Queensland. However, many of the creeks in the Northern creeks area had elevated concentrations of nitrogen. In some cases this was probably due to high organic inputs (eg from decaying vegetation matter), but in a few cases ammonia and oxidised nitrogen concentrations were elevated. Low concentrations of dissolved oxygen and low pH were also prevalent in many of the Northern Creeks, however these waterways are dystrophic systems and low pH and dissolved oxygen is natural for these stream types. It is likely therefore that the overall water quality condition assessments made in this report underestimate the quality of water in these systems. Overall, extremely variable patterns of water quality were detected throughout the Caboolture region, including variable patterns in long-terms trends over time. However, results suggest that the more developed urban areas show evidence of deterioration in water quality and that heavily industrialised areas have high concentrations of some toxicants in sediments. Some sites in close proximity to highways and major road had elevated concentrations of total petroleum hydrocarbons and lead in the sediments. Faecal contamination was evident near some industrial sites and in canal developments, the latter probably due to poor flushing, urban run-off and inputs from congregations of waterbirds. These observations highlight opportunities for management intervention for the improvement of the ecological health of waterways throughout the Caboolture Shire. Figure i. (overleaf) Summary map of results of water quality assessments for the Caboolture Region for the year 2001 – 2001. These ratings represent assessments based on water quality data for the period October 2000 to September 2001. The dots indicate the latest water quality assessments in comparison to the Queensland Water Quality Guidelines (green = good, yellow = moderate, red = poor, grey = insufficient data or median was detection limit which was greater than the guidelines). 3
# # # # # Wararba Ck # # CABOOLTURE # # # # # # # # Sheepstation Ck Burpengary Ck Lagoon Ck # # # # # # # # # # # # Mellum Ck # # # # # # # # # # # # # # Bells Ck # # # # # # Hussey Ck Elimbah Ck # Ningi Ck # # # # # # # # # # # # # Caboolture # Rv # # # Saltwater Ck # # # # # # # # # # # # # # # # # # Pumicestone # Passage # # ## # # # # # # # # # # # # # # # # # # # Bribie Island # # # # ### # # Deception Bay Water quality condition # Good # Moderate # Poor Shire boundary Major land use Settlement Open Space/Forest Rural Other/unknown N 4 0 4 8 Kilometres Figure i Page 4 #
Page 1 and 2: Caboolture Water Quality Study 1999
Page 3: Caboolture Water Quality Study EXEC
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Page 9 and 10: Caboolture Water Quality Study turb
Page 11 and 12: Caboolture Water Quality Study Tabl
Page 13 and 14: Caboolture Water Quality Study In t
Page 17 and 18: Caboolture River Catchment 5.1 Cabo
Page 19 and 20: Caboolture River Catchment Figure 7
Page 21 and 22: Caboolture River Catchment conditio
Page 23 and 24: Burpengary Creek Table 8. Water qua
Page 25 and 26: Saltwater Creek Table 10. Water qua
Page 27 and 28: Deception Bay 5.4 Deception Bay Wat
Page 29 and 30: Bribie Island 5.5 Bribie Island Ove
Page 31 and 32: Pumicestone Passage 5.6 Pumicestone
Page 33 and 34: Pumicestone Passage Figure 14. Box
Page 35 and 36: Northern Creeks Table 17. Water qua
Page 37 and 38: Northern Creeks 5.7.8 Bullock Creek
Page 39 and 40: Caboolture Water Quality Study REFE
Page 47 and 48: Caboolture Water Quality Study Appe
Page 49 and 50: Appendix C: Results of water qualit
Page 51 and 52: Table 23. Water quality assessments
Page 53 and 54: pH Conductivity Dissolved Oxygen Tu
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Table 26. Medians for selected wate
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Table 28. Medians for selected wate
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C3: Box plots - Northern Creeks (PR
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C4: Box plots - Bribie Island (CSC
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C5: Box plots - Bribie Island (PRCM
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C5: Box plots - Bribie Island (PRCM
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C6: Box plots - Caboolture Region (
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C8: Box plots - Burpengary Creek (C
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C9: Box plots - Saltwater Creek (CS
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C9: Box plots - Saltwater Creek (CS
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C10: Box plots - Pumicestone Passag
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C12: Box plots - Deception Bay (EPA
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C12: Box plots - Deception Bay (EPA
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Appendix E: Results of Depth Profil
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Appendix F: Map of Fish Community A
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Appendix H: Map of Land Use Zones F
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