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Annual Waterways Report Annual Waterways Report King - Henty Catchment Water Assessment Branch 2009 ISSN: 1835-8489 Copyright Notice: Material contained in the report provided is subject to Australian copyright law. Other than in accordance with the Copyright Act 1968 of the Commonwealth Parliament, no part of this report may, in any form or by any means, be reproduced, transmitted or used. This report cannot be redistributed for any commercial purpose whatsoever, or distributed to a third party for such purpose, without prior written permission being sought from the Department of Primary Industries and Water, on behalf of the Crown in Right of the State of Tasmania. Disclaimer: Whilst DPIW has made every attempt to ensure the accuracy and reliability of the information and data provided, it is the responsibility of the data user to make their own decisions about the accuracy, currency, reliability and correctness of information provided. The Department of Primary Industries and Water, its employees and agents, and the Crown in the Right of the State of Tasmania do not accept any liability for any damage caused by, or economic loss arising from, reliance on this information. Department of Primary Industries and Water King-Henty Catchment Contents 1. About the catchment 2. Streamflow and Water Allocation 3. River Health 1. About the catchment The King-Henty catchment drains approximately 1,800 km 2 of land around the townships of Strahan, Queenstown and Zeehan on the west coast of Tasmania. Major rivers in the catchment include the King and Queen rivers, which together discharge into the north end of Macquarie Harbour, and the Henty and Little Henty rivers which discharge directly into the Southern Ocean. The catchment experiences some of the highest rainfall in Tasmania, with annual rainfall in excess of 2,500 mm across most of the catchment. Two human-related activities have had a significant impact on the catchment; mining and hydro- electric power developments. A major power scheme in the King River has created 54 km 2 Lake Burbury. Water from Lake Burbury is re-routed through a tunnel and discharged to the lower King River just upstream of the junction of the Queen River. Parts of the headwaters of Lake Burbury lie within the Tasmanian Wilderness World Heritage Area. There is a long history of mining in the catchment, most notably in the headwaters of the Queen River at Mt Lyell. Acid mine drainage and tailings from past mining activities continue to impact on the environmental conditions of many rivers in the King-Henty catchment. DEPARTMENT of and - 1 - PRIMARY INDUSTRIES WATER 2. Streamflow & Water Allocation Streamflow There are no streamflow monitoring stations Water Use Restrictions maintained in the King-Henty catchment as There are no water restriction triggers in part of DPIW’s state-wide monitoring. existence for the King-Henty catchment. Water Allocation The King-Henty catchment had a total of 18,797 ML in licensed allocations for 2008. The following table shows the breakdown of the allocations. Total Allocation (ML) Irrigation - Stock & Domestic - Water supply 2,054 Mining 16,743 Of the total licensed water allocation within this catchment, 13,131 ML is held within constructed storages and 5,666 ML is taken directly from rivers and streams. - 3 - 3. River Health The Australian River Assessment Ewart Creek at Zeehan Highway System (AUSRIVAS) is a This site is located approximately 3 kilometres standardised national system for upstream of the confluence of the Henty River assessment of river condition that and Ewart Creek and is sampled immediately uses benthic macroinvertebrates. upstream of the Zeehan Highway crossing. The AUSRIVAS models predict the The stream is heavily shaded and has good aquatic macroinvertebrate fauna native riparian cover, although the width of the that would be expected to occur at riparian zone on the right bank is restricted to a site in the absence of 10 metres by the Zeehan Highway. The reach environmental stress such as is characterised by shallow riffles and runs over pollution, habitat degradation or cobbles and large moss covered boulders. flow regulation. A comparison of Visual assessments indicate the instream the macroinvertebrates expected habitat to be in good condition with only minor to occur at the test site with those disturbance due to road runoff. actually collected (O/E ratio), Combined season assessments for the riffle provides a site-specific measure of and edgewater habitats have classified this site the biological impairment of the as equivalent to reference (Band A) condition test site. Further details about or above (Band X) on all but a single occasion AUSRIVAS can be found at: since 1994. www.ausrivas.canberra.edu.au Name Season O/E Taxa Band O/E Taxa Band /ausrivas Riffle Edgewater AUSRIVAS assessments are carried Ewart Creek at Spr94/ Au95 0.87 B 1.16 X Zeehan H'way Spr95/ Au96 0.96 A 1.08 A out at two locations in the King- Au97/ Spr97 NS NS Henty catchment: Au98/ Spr98 1.07 A 1.02 A Au99/ Spr99 1.21 X 0.89 A • Ewart Creek at Lyell Highway; Au00/ Spr00 1.07 A 0.87 A and Au01/ Spr01 1.13 A 1.1 A Au02/ Spr02 1.17 X 1.1 A • Henty River at Lyell Highway. Au03/ Spr03 1.04 A 1.08 A Spr03/ Au04 1.07 A 1 A Spr04/ Au05 1.13 X 1.08 A Spr05/ Au06 0.97 A 1.15 X Spr06/ Au07 1.18 X 1.07 A Spr07/ Au08 1.13 X NS Au08/ Spr08 1.13 X NS 1.4 1.2 1 0.8 0.6 O/E Taxa O/E 0.4 Riffle 0.2 Edgewater 0 Spr94/ Au97/ Au99/ Au01/ Au03/ Spr04/ Spr06/ Au08/ Fig: Ewart Creek at Lyell Highway. Au95 Spr97 Spr99 Spr01SeasonSpr03 Au05 Au07 Spr08 Fig: Combined season AUSRIVAS O/E Taxa scores for Ewart Creek at Lyell Highway. - 4 - Henty River at Zeehan Highway This site is in the lower reaches of Water quality at the site has been good on all the Henty River, approximately 9 sampling occasions with low nutrient levels and kilometres upstream of the all other variables within ranges expected for a confluence of the Henty and river of this type. Yolande rivers. Both banks support Single and combined season assessments of thick native vegetation, which the riffle habitat indicate the richness of the extends to the rivers edge. The macroinvertebrate fauna is similar to that riparian zone is intact with only expected at a reference condition site (Band minor disturbance due to the Lyell A). Edgewater assessments are more variable Highway crossing. with O/E scores from single season models While most of the reach is ranging from 0.76 (Band B) to 1.2 (Band X). characterised by fast flowing riffles The lower scores for the edgewater habitat is a and runs, large boulders which reflection of the limited amount of habitat dominate the substrate (see figure) available under higher flows rather than any create patches of slower flowing anthropogenic impact. No assessment was water and pools from which possible in spring 1995 due to the lack of edgewater samples are taken. suitable edgewater habitat. The hydrology of the river has been altered with the construction Name Season O/E Taxa Band O/E Taxa Band of three dams (Henty, White Spur Riffle Edgewater and Newton). Waters from the Henty River at Spr94/ Au95 0.96 A 0.87 A headwaters of the Henty River and Zeehan H'way Spr95/ Au96 0.94 A NS its tributaries is diverted into the Spr03/ Au04 0.92 A 1.18 X Spr04/ Au05 0.9 A 1.08 A headwaters of the Anthony River Spr05/ Au06 0.93 A 0.95 A as part of the Pieman River power Spr06/ Au07 1.05 A 1.06 A development. Spr07/ Au08 0.89 A NS Au08/ Spr08 0.98 A NS 1.4 1.2 1 0.8 0.6 O/E Taxa O/E 0.4 Riffle 0.2 Edgewater 0 Spr94/ Spr95/ Spr03/ Spr04/ Spr05/ Spr06/ Spr07/ Au08/ Au95 Au96 Au04 Au05 Au06 Au07 Au08 Spr08 Season Fig: Combined season AUSRIVAS O/E Taxa scores for the Henty River at Lyell Highway. Fig: Henty River at Lyell Highway. - 5 - .
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