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

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Caboolture Water Quality Study 6.0 CONCLUDING REMARKS Variable patterns of water quality condition were resolved throughout the Caboolture region, including variation in patterns of long-term trends over time. However, results suggest that more developed (settled) areas, and some sites in agriculture areas, show evidence of deterioration in water quality. Values for pH and dissolved oxygen were below reference values for the Northern Creeks. However, these creeks are dystrophic systems, which are characterised by naturally low concentrations of these indicators. Reference values for pH and dissolved oxygen for these water types need to be determined to ensure that water quality can be assessed against guidelines that reflect “natural” conditions more adequately. The heavily industrialised areas had high concentrations of some toxicants in sediments and some sites in close proximity to highways and major roads 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. Despite being suggestive of faecal contamination in Saltwater Creek and in some canals on Bribie Island, these results were not derived from a sampling regime recommended by the National Guidelines (ANZECC & ARMCANZ, 2000) and were therefore not directly comparable with the guidelines. Overall, water quality, sediment and faecal coliform monitoring has resolved important trends in the ecological condition of major waterways in the Caboolture region, and has highlighted “hotspots” which present opportunities for management intervention to improve water quality. 37
Caboolture Water Quality Study REFERENCES Bayly, I.A.E. (1966) Queensland’s Coastal Dune Lakes and their Life. Wildlife Australia 3: 154 – 157. Cullen, E. L. (2000). Surface Water Quality of the Freshwater section of Elimbah Creek, Pumicestone Passage. Hons Thesis, School of Natural Resource Sciences. Queensland University of Technology. EPA (2001) Draft Queensland Water Quality Guidelines (version 2), Queensland Environmental Protection Agency, Brisbane. Langdon, S. (2001). Prioritising stream regeneration works to protect and restore fish habitat NHT project - Progress report. CSC/Griffith Uni. SoR (2001). State of the Rivers: Pumicestone Region Subcatchments. Prepared by Eberhard, R. and van Manen, N. Department of Natural Resources and Mines. Natural Resource Sciences, Brisbane. Burgess, R., Tapsall, A., Juniper, M., Morton, R. (1998). Atlas of Natural Assets, Riparian and Reserve Vegetation. Report prepared by WBM Oceanics Australia for Caboolture Shire Council. SCCMAP. (1999). Saltwater Creek Catchment Management Plan. Volume 1. Prepared by Geo-End Australia, Willing & Partners and Natural Resource Assessments for Pine Rivers Shire Council, Caboolture Shire Council and Redcliffe City Council. 38
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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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