DIURON REVIEW Volume 2 of 4 Supplemental Environmental Assessment Report Runoff Risk Assessment This Report was prepared for the APVMA by Department of Sustainability, Environment, Water, Population and Communities 9 July 2012 © Australian Pesticides and Veterinary Medicines Authority 2012 ISBN 978-1-922188-01-4 (electronic) Ownership of intellectual property rights in this publication Unless otherwise noted, copyright (and any other intellectual property rights, if any) in this publication is owned by the Australian Pesticides and Veterinary Medicines Authority (APVMA). The APVMA has made all reasonable efforts to contact owners of copyrighted materials contained within this publication and obtain or confirm their agreement to the use of these materials. If you are the owner of any copyright material contained in this report and have concerns about the use of your material, please contact us at the details below. 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V2.2, V2.11, V2.18, V2.19, V2.20, V2.21, V2.22, V2.23, V2.24, V2.26, V2.27, V2.29, V2.31, V2.32 and V2.36. For copyright licensing information for these figures, see www.daff.gov.au/about/copyright Australian Government Bureau of Meteorology Figure V2.3 is sourced from the Bureau of Meteorology (BOM) website at www.bom.gov.au/jsp/ncc/climate_averages/raindays/index.jsp?period=an&product=10mm#maps. Figure V2.12 (part) is sourced from the BOM website at www.bom.gov.au/jsp/ncc/climate_averages/raindays/index.jsp?period=an&product=25mm. For copyright licensing information for these figures, see www.bom.gov.au/other/copyright.shtml?ref=ftr Australian Soil Resource Information System (ASRIS) Figure V2.4; V2.10 and all other figures relating to soil organic carbon content are sourced from the Australian Soil Resource Information System website at www.asris.csiro.au/index_ie.html# For copyright licensing information for these figures, contact ASRIS as per details at www.asris.csiro.au/contacts.html. Please check the disclaimers on this website carefully as well before deciding to use any images from this source. Land & Water Australia (LWA) Figure V2.5 has been sourced from the LWA website at www.lwa.gov.au, which states all material is freely available for use. Neil Clark & Associates Figures V2.6, V2.8 and V2.9 are used with permission from Neil Clark & Associates. For further information on the use of these maps, see maps.neilclark.com.au/web/home.php. Cotton Catchment Communities CRC Fig V2.12 (part)) is sourced from the Cotton Catchment Communities CRC website at www.cottoncrc.org.au/catchments/MyCatchments/Cotton_Catchments. Use of this figure is governed by the terms and conditions at www.cottoncrc.org.au/general/Disclaimer. Google Maps (© 2012 Google) Figures V2.14 and V2.15 were sourced from Google Maps and used according to the terms and conditions at http://support.google.com/maps/bin/static.py?hl=en&ts=1342531&page=ts.cs. Details of specific suppliers for these maps are identified in the figures. Pulse Australia Figures V2.17 and Table V2.34 were sourced from Pulse Australia at www.pulseaus.com.au/index.aspx. Users wishing to cite or use this material are recommended to review the Pulse Australia disclaimer at www.pulseaus.com.au/disclaimer.aspx. Queensland Department of Environment and Resource Management (DERM), Figure V2.20 is sourced from the previous Queensland Department of Environment and Resource Management (see www.derm.qld.gov.au/). Users should consult the copyright notice at www.derm.qld.gov.au/legal/copyright.html prior to any further use. NSW Office of Environment & Heritage Figures V2.21 (part) and V2.22 (part) have been sourced from the NSW Office of Environment & Heritage website at www.environment.nsw.gov.au/ieo/murrumbidgee/maplg.htm and www.environment.nsw.gov.au/ieo/MacquarieBogan/maplg.htm respectively. Users should review the notice at www.environment.nsw.gov.au/help/copyright.htm before reusing this material. Australian Banana Growers Council (ABGC) The use of Figure V2.34 from the ABGC website (see http://abgc.org.au/?subtropical-regions) has been approved in private correspondence. Users should contact the ABGC (see http://abgc.org.au/?corporate/contact-us) before re-using this material. Horticulture Australia Figure V2.35 is sourced from the Horticulture Australia website at www.horticulture.com.au/. Users should contact Horticulture Australia (see www.horticulture.com.au/contact_us/default.asp) prior to re-using this material. Supplemental Environmental Assessment Report Diuron Runoff Risk Assessment Volume 2 of 4 Environment Protection Branch 9 July 2012 II Table of Contents V2.1 INTRODUCTION ............................................................................................................... 1 V2.1.1 The revised runoff model ................................................................................................. 1 V2.1.2 Choice of Kd .................................................................................................................... 1 V2.1.3 Runoff Risk Assessment Framework ............................................................................... 2 V2.1.4 Discussion on the Combined Rainfall Probability Value ................................................ 5 V2.1.5 Discussion on outcomes of the framework ...................................................................... 7 V2.1.6 Information relied on in the assessment ........................................................................... 9 V2.1.6.1 MCAS ...................................................................................................................... 9 V2.1.6.2 Bureau of Meteorology .......................................................................................... 10 V2.1.6.3 Soil Organic Carbon Content ................................................................................. 12 V2.1.6.4 Stream Flow Data................................................................................................... 13 V2.1.6.5 Australian Surface Water Characteristics .............................................................. 14 V2.2 BROADACRE CROPS - WINTER CEREALS ................................................................ 14 V2.2.1 Wheat, barley, triticale, cereal rye and oats, WA Only ................................................. 16 V2.2.1.1 Organic Carbon in Topsoil ..................................................................................... 16 V2.2.1.2 Application rates and timing .................................................................................. 17 V2.2.1.3 Mitigation arguments, Regions 36 and 37. ...........................................................