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Background Document - Water Management Plan WHEATBELT NRM Background Document - Water Management Plan Stormwater Assessment - Shire of York May 2011 [Type the abstract of the document here. The abstract is typically a short summary of the contents of the document. Type the abstract of the document here. The abstract is typically a short summary of the contents of the document.] Stormwater Assessment – Shire of York This report was funded through the Western Australian State NRM Program, an initiative of the Western Australian Government. This document was prepared by Matt Giraudo, Hydrologic Consultant, under contract to Wheatbelt NRM © Wheatbelt NRM, Northam, Western Australia. May 2011 Acknowledgements The Shire of York is acknowledged for providing significant input into the project, including provision of key datasets, information and advice. The Department of Water, Western Australia is acknowledged for providing datasets for the project including access to floodplain mapping of the Avon River. Page 2 Stormwater Assessment – Shire of York Executive Summary On average the Avon River contributes approximately 69% of total annual nitrogen (TN) and 43% of total annual phosphorous (TP) load to the Swan - Canning Estuary. Avon River pools and riparian vegetation of the river and its tributaries are important in buffering water quality, including cycling of nutrients and controlling sediment loads within the river. Stormwater from Avon Arc towns carries a range of pollutants including suspended sediment, hydrocarbons, nutrients and metals. River pools downstream of key urban areas within the Avon Arc are typically eutrophic or are reported to contain nutrient enriched sediments. The York Shire contains a relatively high proportion of Avon River pools considered to retain high environmental values. A number of these pools are impacted by poor water quality including excessive nutrient discharge, likely to be exacerbated by proposed future development. A daily time-step hydrology and water quality model was developed for 38 subcatchents within the town of York using MUSIC V4 (eWater 2010) for the period 1999 – 2009, coinciding with the available nutrient monitoring data for the Avon River. Six minute time step modelling was also undertaken to assess peak flows for critical stormwater nodes. Modelling undertaken indicates that the York townsite currently contributes in the order of 6.3% (145 kg/yr) and 1.5% (1,650 kg/yr) of TP and TN loads respectively, when compared to estimated nutrient loads within the Avon River at the York townsite. This translates to approximately 0.56% and 0.66% of the TP and TN loads entering the Swan – Canning Estuary. Modelling undertaken indicates that proposed new development within the town of York is likely to result in a 120% increase in TP and a 68% increase in TN discharging to the Avon River, over and above from estimated 1999 -- 2008 discharge levels. More detailed assessment of individual stormwater catchments within York is presented. The assessment includes hydrologic, hydraulic and water quality analysis of current and projected catchment conditions. Presented are recommendations for infrastructure works to mitigate potential impacts associated with proposed urban development within York. Recommendations are preliminary, and focus on mitigation of both hydraulic and water quality issues arising from proposed development. Page 3 Stormwater Assessment – Shire of York Contents 1 Introduction ............................................................................................................................................ 8 2 Background ............................................................................................................................................ 9 2.1 Urban ............................................................................................................................................. 9 2.2 Rural ............................................................................................................................................ 10 2.2.1 Risk Factors ............................................................................................................................ 11 3 Environmental Assets .......................................................................................................................... 12 3.1 Avon River ................................................................................................................................... 12 3.2 River Pools .................................................................................................................................. 12 3.2.1 Wilberforce Pool ...................................................................................................................... 13 3.2.2 Church Pool ............................................................................................................................. 13 3.2.3 Little Pool ................................................................................................................................. 13 3.2.4 Tipperary Pool ......................................................................................................................... 13 3.2.5 Mears Pool .............................................................................................................................. 13 3.2.6 Three Mile Pool ....................................................................................................................... 13 3.2.7 Mile Pool .................................................................................................................................. 13 3.2.8 Blands (Town) Pool ................................................................................................................. 13 3.2.9 Railway Pool ............................................................................................................................ 14 3.2.10 Cold Harbour Pool ............................................................................................................... 14 3.2.11 Mt Hardy Pool ...................................................................................................................... 14 3.2.12 Gwambygine Pool ............................................................................................................... 14 3.2.13 Oakover Pool ....................................................................................................................... 14 3.2.14 Threatening Processes ....................................................................................................... 14 3.3 Tributaries ................................................................................................................................... 15 3.3.1 Mackie River ............................................................................................................................ 15 3.3.2 Thirteen Mile and Warranine Brooks....................................................................................... 15 3.3.3 Mortock River .......................................................................................................................... 16 4 Stormwater Assessment ...................................................................................................................... 17 4.1 Background ................................................................................................................................. 17 4.2 Mt Hardy – Gwambygine ............................................................................................................. 19 4.2.1 Recommendations .................................................................................................................. 20 4.3 Equine Precinct ........................................................................................................................... 22 4.3.1 Recommendations .................................................................................................................. 22 Page 4 Stormwater Assessment – Shire of York 4.4 North West Precinct .................................................................................................................... 24 4.4.1 Peak Flows .............................................................................................................................. 24 4.4.2 Nutrients .................................................................................................................................. 24 4.4.3 Recommendations .................................................................................................................. 26 4.5 West Central Residential Precinct............................................................................................... 28 4.5.1 Recommendations .................................................................................................................. 29 4.6 Commercial Precinct ................................................................................................................... 31 4.6.1 Nutrient Load ........................................................................................................................... 31 4.6.2 Peak Flows .............................................................................................................................. 32 4.6.3 HECRAS Modelling ................................................................................................................. 34 4.6.4 Recommendations
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