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State of the Derwent Report Card 2013

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State of the Derwent Report Card 2013 Year 2013 STATE OF THE DERWENT Report Card POLLUTION SOURCES, LOADS AND TRENDS SEDIMENT: total suspended sediment (TSS) Pollution enters the Derwent estuary from Industries have historically been the THE DERWENT ESTUARY MANAGEMENT AND ENVIRONMENTAL estimated cumulative loads 2003-12 RESTORATION MONITORING AND 30000 many sources, commonly referred to as largest point sources of organic matter The Derwent estuary lies at the heart of REPORTING 25000 ‘point sources’ and ‘diffuse sources’. Point and heavy metals to the estuary; however the Hobart metropolitan area and is a The Derwent Estuary Program (DEP) 20000 Industry sources include sewage treatment plants inputs of these pollutants have declined 15000 waterway of great natural beauty and was established in 1999 as a partnership A fundamental requirement for WWTPs 10000 Stormwater and large industries, such as the Norske significantly in recent years. Since 2007, diversity. Named after the Celtic word to restore and protect the Derwent effective natural resource management tonnes/year River 5000 Skog paper mill at Boyer and Nyrstar organic loads from the Norske Skog ‘clear water’ in 1794, the Derwent is estuary. The program has been is an on-going and reliable source of 0 Hobart zinc smelter at Lutana. paper mill have fallen by over 95%. At the an integral part of Tasmania’s cultural, successful in bringing together a wide environmental data. This principle 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 Nyrstar Hobart smelter, projects to collect economic and natural heritage. The range of stakeholders – firstly to build forms the basis of the DEP’s cooperative Diffuse sources include stormwater and treat contaminated groundwater estuary is an important and productive a common understanding, vision and monitoring program between the runoff from urban areas and the ORGANIC MATTER: biochemical oxygen demand (BOD) captured 105 tonnes of zinc and other ecosystem and supports a wide range of management framework – and secondly state government, councils, industries estimated cumulative loads 2003-12 larger catchment inputs carried by 10000 heavy metals in 2012, and all stormwater habitats and species. to progressively implement this vision and research institutes. Formerly the Derwent and Jordan rivers. Other discharges from the site were successfully through partnership agreements and independent monitoring programs are Industry diffuse pollutant sources include landfills 5000 WWTPs intercepted and treated. practical actions. now coordinated so as to provide better and contaminated sites, air pollution, tonnes/year information on the estuary as a whole, aquaculture operations, and wastes Urban stormwater contributes the The program was initially designed to 0 and to report annually on environmental 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 associated with shipping, ports and majority of faecal bacteria to the estuary, address environmental quality issues such conditions and trends in the Derwent. marinas. Sediments within the estuary derived from animal droppings, aging as industrial and urban water pollution, itself may also release pollutants into the infrastructure, sewage overflows, and contaminated sediments, introduced NUTRIENTS: total nitrogen (TN) overlying waters under certain conditions. cross connections between the sewage species and loss of estuarine ecosystems. estimated cumulative loads 2003-12 1800 and stormwater systems. Stormwater is More recently, foreshore issues have 1600 Contaminants released or transported 1400 also the main source of litter. 1200 Approximately 40% of Tasmania’s also been included within the program. Industry into the Derwent from these various 1000 WWTPs population - 216,000 people - live around Key aspects of implementation include 800 sources include pathogens, nutrients, Catchment and Channel: Recent studies 600 Stormwater tonnes/year the estuary’s margins. The Derwent is environmental monitoring and reporting, 400 River organic matter, silt, litter and a range of suggest that diffuse inputs of nutrients 200 widely used for recreation, boating, coordination of regional activities, and 0 toxicants including heavy metals, resin from both the River Derwent catchment 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 fishing, marine transport and industry. implementation of priority projects such acids and hydrocarbons. and the D’Entrecasteaux Channel play a key role in the health of the estuary. Further upstream, the River Derwent as stormwater management, heavy metal Sewage treatment plants are the largest The amount of water released from the supplies the majority of the region’s remediation and conservation of key This ‘Report Card’ summarises monitoring NUTRIENTS: total phosporous (TP) point sources of bioavailable nutrients to drinking water supply and is a major estuarine habitats and species. data collected by the DEP and our estimated cumulative loads 2003-12 catchment is also an important factor 250 the estuary. In 2012, discharges of treated for both water quality and ecosystem source of hydroelectric power. partners, as well as other relevant 200 sewage effluent decreased by about 19%, The DEP is supported by the Tasmanian Industry information collected during 2012 and the 150 health. To better understand current A number of environmental issues affect Government, six councils that border WWTPs and associated nutrients, TSS and BOD 100 Stormwater conditions and trends, a detailed review start of 2013, including: tonnes/year the Derwent estuary, in particular: on the estuary (Brighton, Clarence, River also declined by an estimated 4% to 16%. 50 of D’Entrecasteaux Channel water quality • weekly recreational water quality Effluent reuse to support agriculture and • heavy metal contamination; Derwent Valley, Glenorchy, Hobart and 0 testing during summer months; 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 data was carried out in 2012 (see below). • poor recreational water quality at Kingborough Councils) and five business other beneficial uses increased slightly in • monthly whole-of-estuary water some bays and beaches; partners (Nyrstar Hobart, Norske Skog 2012 to 11% of the total effluent produced quality monitoring; • low oxygen levels in the upper estuary Boyer, Tas Water, TasPorts and Hydro in the metropolitan area. • surveys of heavy metal levels in fish NUTRIENTS: dissolved inorganic nitrogen (DIN) during summer; Tasmania). Other project partners include estimated cumulative loads 2003-12 and shellfish; 700 • locally elevated nutrient levels; the Australian Government, University 600 D’ENTRECASTEAUX CHANNEL PARTNERSHIP 500 of Tasmania, CSIRO, NRM South, local • biological surveys (little penguins, Industry The D’Entrecasteaux Channel and Huon Estuary are areas of great beauty and biodiversity, and • low summer flows and barriers to fish 400 WWTPs businesses and community groups. spotted handfish) ; and 300 Stormwater an important centre for population growth, marine farming and recreational boating and fishing. migration; tonnes/year 200 River The Channel also has a strong influence on the Derwent estuary, as there is a net flow of seawater • weed surveys and control actions (rice 100 • introduced marine pests and weeds; In 2010, the DEP was awarded Australia’s from the Channel into the Derwent. In 2012, the D’Entrecasteaux Channel Project was launched grass, karamu). 0 • loss of habitats and species; and National Riverprize for excellence in river 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 as an initiative of Kingborough and Huon Valley Councils, Southern Water, Tassal and Huon Aquaculture, NRM South and the DEP. The DEP’s role in the project is to provide technical and • impacts of climate change, e.g. management. More detailed information is published in financial support, including a $50,000 grant awarded through the International RiverFoundation’s erosion, flooding and habitat loss five-yearly State of the Derwent Estuary Twinning Program. reports, available on our website: HEAVY METALS (Zn and Cd) Although there have been significant Capture from groundwater at Nyrstar The main objectives of the project are to: www.derwentestuary.org.au improvements in the treatment of sewage 140 • Promote the values of the Channel and lower Huon Estuary 120 • Bring together existing science to better understand the waterways and industrial wastes over the past 100 • Improve the availability of information on the waterways to all stakeholders decade, the Derwent still faces a number 80 • Initiate a collaborative approach to managing the Channel and lower Huon Estuary that 60 of environmental challenges. A strategic tonnes/year 40 addresses the full range of uses and issues and coordinated planning approach 20 The Project was formally launched in December 2012, followed by publication of the State of the 0 D’Entrecasteaux and lower Huon Estuary 2012. This report provides a comprehensive review of across all levels of government, industry 2006-072007-08 2008-09 2009-102010-112011-122012-13 environmental data for the period from 1999 to 2012, and is a valuable resource for managers, and the community is our best hope for a scientists and the community. For more information about the project, including reports, see clean and healthy estuary in the future. www.kingborough.tas.gov.au/page.aspx?u=660 DERWENT WATER AND SEDIMENT QUALITY DERWENT HABITAT AND SPECIES CLIMATE IN 2012 WATER QUALITY Although nutrient enrichment and HEAVY METALS IN ESTUARINE HABITAT & MARINE PESTS AND WEEDS INDICATORS nuisance algal blooms
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