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Lower Vasse River Waterway Management Plan Draft for Public Comment

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Lower Vasse River Waterway Management Plan Draft for Public Comment Lower Vasse River Waterway Management Plan Draft for public comment 1 Contents Acknowledgement of Wadandi people and country ............................................................................. iii Executive Summary ................................................................................................................................ iv Living Streams vii Implementation vii 1 Introduction .................................................................................................................................... 1 1.1 Background to this Waterway Management Plan ...................................................... 1 1.2 Study area description ................................................................................................ 2 1.3 History of management .............................................................................................. 5 1.4 Process for developing the Waterway Management Plan ......................................... 5 2 Management Issues ........................................................................................................................ 9 2.1 Water quality .............................................................................................................. 9 2.2 Ecology ...................................................................................................................... 13 2.3 Water Flow ................................................................................................................ 20 2.4 Sediments.................................................................................................................. 21 2.5 Amenity ..................................................................................................................... 23 2.6 Recreation and Education ......................................................................................... 23 2.7 Culture and Heritage ................................................................................................. 23 2.8 Governance ............................................................................................................... 25 3 Management objectives ............................................................................................................... 27 4 Review of Management Options .................................................................................................. 29 4.1 Living Streams ........................................................................................................... 30 4.2 Reducing nutrient sources ........................................................................................ 32 4.3 Water treatment using specialised clays .................................................................. 34 4.4 Water treatment using microbiological products ..................................................... 36 4.5 Riparian vegetation management ............................................................................ 37 4.6 Managing waterlilies ................................................................................................. 38 4.7 Controlling feral fish .................................................................................................. 39 4.8 Increasing flow inputs from the Vasse Diversion ...................................................... 39 4.9 Improving summer flows .......................................................................................... 40 4.10 Removal of the Butter Factory weir boards .............................................................. 40 4.11 Sediment Removal .................................................................................................... 41 4.12 Recreation and access management ........................................................................ 44 4.13 Governance options .................................................................................................. 45 4.14 Research and monitoring needs ............................................................................... 47 5 Management strategies and actions ............................................................................................ 48 i 5.1 Living Streams ........................................................................................................... 48 5.2 Water Quality ............................................................................................................ 49 5.3 Ecology ...................................................................................................................... 50 5.4 Water Flow ................................................................................................................ 51 5.5 Sediments.................................................................................................................. 52 5.6 Amenity, Recreation and Education ......................................................................... 52 5.7 Culture and Heritage ................................................................................................. 53 5.8 Governance ............................................................................................................... 54 6 Implementation ............................................................................................................................ 55 6.1 Roles and responsibilities .......................................................................................... 55 6.2 Management areas ................................................................................................... 55 6.3 Implementation process ........................................................................................... 55 7 References .................................................................................................................................... 58 8 Appendices .................................................................................................................................... 60 Appendix 1. List of vascular flora found within the Survey Area of the Lower Vasse River (Ecoedge 2017). .................................................................................................................... 60 Appendix 2. Summary of Water Sensitive Urban Design infrastructure....................................... 62 Appendix 3. Recommended revegetation areas for the Lower Vasse River Study area .............. 64 Appendix 4. Suggested species for revegetation of the Lower Vasse River ................................. 65 Figures and Tables Figure 1. Framework for developing the Lower Vasse Waterway Management Plan. .......................... 2 Figure 2. Study area for the Lower Vasse River Waterway Management Plan, showing tenure and landmarks. ............................................................................................................................................... 4 Figure 3. Process for developing the Lower Vasse River Waterway Management Plan ........................ 6 Figure 4. Outcomes of identifying and rating management issues for the Lower Vasse River from the Community Views consultation session, March 2016. ........................................................................... 7 Figure 5. Blue green algal bloom in the Lower Vasse River. ................................................................. 11 Figure 6. Mean concentrations of total nitrogen, total phosphorus and chlorophyll a across spring- summer-autumn sampling seasons (a, c, e) and for each month (b, d, f; data since January 2017). Red dashed lines are guidelines for protection of wetland ecosystems (ANZECC and ARMCANZ 2000). Error bars are +/- standard error. .................................................................................................................. 12 Figure 7. Mean cell densities for main phytoplankton species groups at sampling sites in the Lower Vasse River during spring-summer-autumn seasons since 2012. Red dashed line is the guideline value of 20,000 cells per millilitre for recreational use. ................................................................................. 13 Figure 8. Mexican waterlily in the Lower Vasse River: (a) extensive growth upstream of Strelly Street in March 2017; (b) flower; (c) downstream of infestation in April 2014 showing obvious algal bloom; (d) upstream of infestation in April 2014 (same day) with no algal bloom. ......................................... 16 Figure 9. Comparison of water quality in relation to Mexican waterlily in the Lower Vasse River: downstream of the waterlily infestation, within dense waterlily growth, and in areas of open water between patches of waterlily (200-300m reaches) (Paice 2018). ........................................................ 16 ii Figure 10. Flow management structures for the Lower Vasse River: (a) the valve controlling flow from the Vasse Diversion to the Lower Vasse River via a 900mm pipe; (b) the weir and removable boards at the Butter Factory. ................................................................................................................................ 20 Figure 11. Lower Vasse River bathymetry from Butter Factory weir boards to Isaac Street reserve. 22 Figure 12. Draft Local Planning Strategy (2016) land use within the Lower Vasse River study area. .. 26 Figure 13. Suggestions for the future management of the Lower Vasse River from the Community Views session (AHA 2016). ...................................................................................................................
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