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Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake

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Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake Kerang Lakes Bypass Investigation Project Technical Report THIRD REEDY LAKE PREPARED FOR THE GOULBURN-MURRAY WATER CONNECTIONS PROJECT OCTOBER 2014 Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake DOCUMENT HISTORY AND STATUS Version Date Issued Prepared By Reviewed By Date Approved Version 1 31 May 2013 Bree Bisset Rohan Hogan, Michelle Maher, Louissa 4 June 2013 Rogers, Emer Campbell and Trent Gibson Version 2 5 June 2013 Bree Bisset, Michelle Maher Rohan Hogan and Louissa Rogers 7 June 2013 Version 3 17 June 2013 Bree Bisset, Michelle Maher KLBIP Project Reference Group 1 July 2013 Version 4 2 August 2013 Bree Bisset, Michelle Maher Louissa Rogers 2 August 2013 Version 5 2 August 2013 Bree Bisset, Michelle Maher KLBIP Project Reference Group TBC Version 6 21 August 2013 Bree Bisset, Michelle Maher G-MW CP ERP 26 August 2013 Version 7 4 September 2013 Bree Bisset, Michelle Maher G-MW CP SRP 25 September 2013 Version 8 4 October 2013 Bree Bisset, Michelle Maher G-MW CP ERP TBC Version 9 5 November 2013 Bree Bisset, Michelle Maher Final draft TBC Version 10 12 December 2013 Bree Bisset Rohan Hogan 14 January 2014 Version 11 14 January 2014 Bree Bisset, Rohan Hogan G-MW CP – Pat Feehan Version 12 7 October 2014 Bree Bisset, Rohan Hogan DISTRIBUTION Version Date Quantity Issued To Version 1 31 May 2013 Email Rohan Hogan, Michelle Maher, Louissa Rogers, Emer Campbell and Trent Gibson Version 2 5 June 2013 Internal review Rohan Hogan and Louissa Rogers Version 3 17 June 2013 Email Pat Feehan (G-MW) Version 4 2 August 2013 Email Louissa Rogers Version 5 2 August 2013 Email Pat Feehan (G-MW) Version 6 21 August 2013 Email G-MW CP ERP Version 7 4 September 2013 Email/ Hard copies G-MW CP SRP Version 8 4 October 2013 Email / Hard copy G-MW CP ERP Version 9 5 November 2013 Email G-MW CP – Pat Feehan Version 10 12 December 2013 Email Rohan Hogan Version 11 14 January 2014 Email G-MW CP – Pat Feehan Version 12 7 October 2014 Email G-MW CP – Pat Feehan DOCUMENT MANAGEMENT Printed: 8 October 2014 Last saved: 8 October 2014 11:07 AM File name: KLBIP Third Reedy Lake Technical Report Authors: Bree Bisset, Michelle Maher, Rohan Hogan Name of organisation: North Central CMA Name of document: KLBIP Technical Report – Third Reedy Lake Document version: Version 12 Document manager: NCCMA-63-30448 For further information on any of the information contained within this document contact: North Central Catchment Management Authority PO Box 18 Huntly Vic 3551 T: 03 5440 1800 F: 03 5448 7148 E: [email protected] www.nccma.vic.gov.au © North Central Catchment Management Authority, 2014 Front cover photo: Third Reedy Lake, August 2011, Michelle Maher, North Central CMA The Kerang Lakes Bypass Investigation Project Technical Report - Third Reedy is a working document, compiled from the best available information. It will be subject to revision in the future as new information becomes available. This publication may be of assistance to you, but the North Central Catchment Management Authority and its employees do not guarantee that the publication is without flaw of any kind, or is wholly appropriate for your particular purposes and therefore disclaims all liability for any error, loss or other consequence which may arise from you relying on information in this publication. Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake Please cite this document as: North Central CMA (2014). Kerang Lakes Bypass Investigation Project Technical Report – Third Reedy Lake, North Central Catchment Management Authority, Huntly. Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake EXECUTIVE SUMMARY The Kerang Lakes Bypass Investigation Project (KLBIP) investigates the feasibility of constructing bypass channels around the Reedy Lakes Complex (comprising First, Middle and Third Reedy Lakes), Little Lake Charm and Racecourse Lake. The project, which is part of Goulburn-Murray Water’s (G-MW) Business Case to support Stage 2 of the G-MW Connections Project, aims to remove irrigation demand and develop a variable water regime that will enhance wetland environmental values. Third Reedy Lake is a 230 ha permanent open freshwater lake located approximately ten kilometres north- west of Kerang. The wetland is part of the Kerang Lakes Ramsar Site and is the most northerly wetland in the Reedy Lakes Complex. The permanent operation of Third Reedy Lake since the 1920s has altered the values of the wetland significantly. The small band of littoral vegetation, low species diversity and high weediness is a result of the prolonged stable water levels. However the wetland still provides habitat for a range of flora and fauna species listed under various international, national and Victorian state legislations including species listed under the Environment Protection and Biodiversity Conservation Act 1999. Third Reedy Lake has also supports a small rookery of Australian White Ibis and Straw-necked Ibis on its northern shore. Background information, hydrogeological assessments, flora and fauna surveys as well as technical input was used to determine the preferred environmental water management goal and appropriate water regime for Third Reedy Lake as summarised below: Management goal Provide a watering regime that restores Third Reedy Lake to a deep freshwater marsh (dominated by Intermittent Swampy Woodland (EVC 813)) able to support recruitment of River Red Gums (Eucalyptus camaldulensis) and promoting a diverse and extensive range of habitat suitable for a variety of waterbirds. Preferred regime Establishment phase: A filling regime that provides opportunities for River Red Guns to establish across the wetland by allowing for seed release, seed strike and establishment of seedlings. The regime will include filling wetland to between 74.2m-74.56m AHD and allowing wetland to dry by natural drawdown. When appropriate this will be followed by a series of low level fills (approximately 0.3m to 0.5m deep) to encourage establishment of River Red Gums. The establishment phase will require adaptive management depending on the response from River Red Gum recruitment. This regime should be followed for two to three cycles or until desirable number of saplings have established. Long term management: Providing a watering regime that returns Third Reedy Lake to a deep freshwater marsh dominated by River Red Gums (Eucalyptus camaldulensis) with a sedge and lignum understory and fringing Black Box (Eucalyptus largiflorens) community. Fill once every four years to 74.00m AHD with every third fill to 74.56m AHD. Maintain at 74.56m AHD for one month duration to maintain Black Box and recruited River Red Gums. For other events fill to 74.00m AHD to maintain recruited River Red gums and support Commercial-in-Confidence i Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake lignum and sedge community and allow natural drawdown with wetland remaining dry for the following three years before filling again. Adaptive management is required to ensure the salinity tolerances of ecological objectives i.e. River Red Gum, are not exceeded. This Technical Report also assesses the associated benefits and risks and proposes mitigation strategies required to manage the wetland under the preferred regime. This report also provides a number of recommendations to address key knowledge gaps associated with the project. Commercial-in-Confidence ii Kerang Lakes Bypass Investigation Project Technical Report –Third Reedy Lake CONTENTS PAGE EXECUTIVE SUMMARY ...................................................................................................................................... I CONTENTS PAGE ............................................................................................................................................. III LIST OF FIGURES .............................................................................................................................................. V LIST OF TABLES ................................................................................................................................................ V ACKNOWLEDGEMENTS ............................................................................................................................ VI 1. GOULBURN-MURRAY WATER CONNECTIONS PROJECT ............................................................................. 1 2. PURPOSE AND SCOPE OF DOCUMENT ...................................................................................................... 1 3. BACKGROUND ........................................................................................................................................ 2 3.1. RAMSAR CONVENTION ........................................................................................................................... 4 4. THIRD REEDY LAKE .................................................................................................................................. 7 4.1. BACKGROUND ..................................................................................................................................... 7 5. WATER DEPENDENT VALUES ................................................................................................................... 8 5.1. LISTING AND SIGNIFICANCE ...................................................................................................................... 8 5.2. FLORA ..............................................................................................................................................
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