Overview. Values at risk. Initial impacts. Ongoing Flood Evaluation Activities. SEQ Healthy Waterways Partnership

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2 Waterways as a barometer for recovery: what can we learn? 24 th February 2011 SEQ- EIANZ Forum

3 Overview Values at risk Initial impacts Ongoing Flood Evaluation Activities

4 SEQ values and assets at risk Rural Floodplains Recreation Urban function Fishing Bay Habitats and Tourism

5 Rainfall - Brisbane 250 Brisbane Rainfall - 4th Oct 2010 to 16 Jan Weekly Rainfa all (mm) Total 50 0 Week Commencing

6 Rainfall - Gatton 250 Gatton Rainfall - October 4th 2010 to January 16th ll (mm) Total Weekly Rainfal Week Commencing

7 Intensity of upper catchment flows? Upper part of Hampton to Esk Road

8 Flood Components

9 Flood Plume Extent Looking east across Bribie Island to northern end of Moreton

10 Flood Plume Extent Northern end of fmoreton Island 15 Jan

11 Flood plume off Tangalooma Looking north Looking south

12 Flood Plume Extent West of Crab Island green tinge to the water

13 Marine activity 3m hammerhead shark

14 Flood Plume Extent Clear water off Amity Point on North Stradbroke

15 Flood Plume Extent Cleveland Point Off Manly looking north

16 River Activity Manly harbours City Cats Flyer and tugs

17 Flood Debris Mouth of the river East of the airport

18 Flood Plume Extent Sandgate Pier looking south Redcliffe looking north

19 This flood is the eight highest since 1984

20 Ecosystem Health Monitoring (EHMP) Freshwater 19 major catchments 135 representative sites 5 ecological indicators Estuarine Marine 18 river estuaries 9 zones in Moreton Bay 254 representative ti sites 9 and 8 Ecological indicators

21 EHMP plus additional analysis Focus Parameters Number of Sites Make up of plume Track any industrial contaminants Impact on high value habitats Risks to primary contact by humans Sediment, colour and bottom nutrients Heavy Metals Mix of pesticides, PAHS and BTEX Enterococci All 81 bay sites and near bottom at 34 sites Mouth of Brisbane, Logan, Pine, Caboolture, Pumiscestone Passage and Broadwater 8 bay sites off popular areas

22 Transect N1: 18 Jan 2011 * *Scale: 20 = 20 or greater NTU Information Courtesy of DERM

23 Turbidity contrast between Nov 2010 and Jan 2011 Nov Dec Jan (24 & 26) Information Courtesy of DERM

24 Flood Response Activities Physical Parameters Tuesday 24 January Information Courtesy of DERM

25 Turbidity in the Brisbane and Logan Rivers 24 & 26 Jan Jan 2011

26 Bramble and Deception Bays 20 Jan Jan Jan Jan 2011

27 Eastern Banks and Eastern Bay 19 & 21 Jan Jan & 21 Jan Jan 2011

28 Waterloo Bay 21 Jan Jan 2011

29 Dissolved Oxygen across the Bay 19 & 21 Jan Jan Jan Jan 2011

30 Total metal concentration (mg/l) summary Element Greater than Aus Greater than pre- Trigger Values flood (2010) concs in Brisbane Port aluminium Y Y arsenic 50% Y Y cadmium N N chromium 25% Y Y copper Y Y iron 80% Y Y lead 50% Y 75% N manganese 50% Y Y nickel N 50% Y selenium N N zinc 33% Y N Information Courtesy of DERM

31 Flood impact assessment Catchments Loads Changes in hydrology and geomorphology Issues to be evaluated Load Modelling Restoration and Mitigation Estuarine and marine areas Water Quality EHMP Marine Park Monitoring Sediment geochemistry Modelling to predict impacts and direct sampling Pesticides and toxins Remote Sensing Seagrass ecology Dugong and other macrofauna

32 Conceptual models to guide tracking recovery

33 Nature of upper catchment damage Gatton Creek bank erosion Lower Lockyer gully loss Photos courtesy of SEQ Catchments Landslip in the upper Brisbane near Mt Stanley

34 Sediment load movement over a week Caboolture 18,000 tonnes Information courtesy of DERM Logan Albert Estimated Loss 345,000 tonnes 1, 039,000 tonnes Lockyer 676,000 tonnes Annual load loss is 334,000 tonnes

35 Catchment damage analysis Map Commission post flood LiDAR Utilise pre flood LiDAR to compare with post flood and calculate channel and vegetation change Calculate Field assessment of riparian and watercourse condition Using flood heights build a hydraulic model and estimate stream power Explain Build a story of post flood channel change Utilise experienced observations and local memories Information courtesy SEQ Catchments

36 Flood Response Activities

37 Flood Response Activities Additional Monitoring

38 Flood impact assessment Catchments Loads Changes in hydrology and geomorphology Issues to be evaluated Load Modelling Restoration and Mitigation Estuarine and marine areas Water Quality EHMP Marine Park Monitoring Sediment geochemistry Modelling to predict impacts and direct sampling Pesticides and toxins Remote Sensing Seagrass ecology Dugong and other macrofauna

39 Habitat and Species Models

40 Seagrass Dynamics

41 Seagrass Beds Clear water off Amity Point on North Stradbroke

42 Dugong dynamics Impact possibility Loss of seagrass supply Increased risk of diseases as animals become weaker Die from starvation Standings commence within 4 months of flood

43 Dugongs of Moreton Bay Photo Courtesy of Tangalooma Wild Dolphin Resort

44 Flood Response Activities Aquatic Ecosystem Assessments

45 Flood Response Activities Debris Clean up Major community focus on Clean up Australia Day on Sunday 6 March

46 Recreational risk assessment and reporting Consortium of SEQ Councils, Water Utilities, State Govt and Healthy Waterways Monitor, assess and report Annual classification of recreational areas Community awareness and solutions lti to safe guard well being

47 Who can benefit from lessons learnt? Organisations SubGroups Areaof interest Queensland Environment Committee State wide Reconstruction Authority BCC Recovery taskforce Brisbane SEQ Catchments Rural support and SEQ focus on Lockyer restoration Upper Brisbane

48 Piet Filet