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Swan and Helena Rivers Flood Study: Hydrology Final Report Version 3 May 5, 2016

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Swan and Helena Rivers Flood Study: Hydrology Final Report Version 3 May 5, 2016 Swan and Helena Rivers Flood Study: Hydrology Final report Version 3 May 5, 2016 Department of Water, the Cities of Bayswater, Belmont and Swan are acknowledged as significant partners on this project. Document status Client Eastern Metropolitan Regional Council Project Swan and Helena Rivers Flood Study: Hydrology This version Version 3 Authors David Stephens Project manager David Stephens File name EMR00001_R_SwanHelenaHydrology_Final_version3.docx Project number EMR00001 Document history Version Date issued Reviewed by Approved by Sent to Comment Draft A 10/2/16 Peter Hill Peter Hill Catherine Nind (EMRC) Final 1 30/3/16 Peter Hill Peter Hill Catherine Nind (EMRC) Final 2 13/4/16 Peter Hill Peter Hill Catherine Nind (EMRC) Final 3 5/5/16 Peter Hill Peter Hill Catherine Nind (EMRC) Copyright and Limitation This report has been produced by Hydrology and Risk Consulting Pty Ltd ACN 603 391 993 (“HARC”) for Eastern Metropolitan Regional Council. Unless otherwise indicated, the concepts, techniques, methods and information contained within the report are the intellectual property of HARC and may not be reproduced or used in any form by third parties without the express written consent of HARC and Eastern Metropolitan Regional Council. The report has been prepared based on the information and specifications provided to HARC by Eastern Metropolitan Regional Council. HARC does not warrant this document as being complete, current or free from error and disclaims all liability for any loss, damage, costs or expenses (including consequential losses) relating from this report. It should only be used for its intended purpose by Eastern Metropolitan Regional Council and should not be relied upon by third parties. Copyright © Hydrology and Risk Consulting Pty Ltd ACN 603 391 993. All rights reserved. i EMR00001_R_SwanHelenaHydrology_Final_version3.docx Swan and Helena Rivers Flood Study: Hydrology Contents 1. Introduction 9 2. Overview of flood study 10 2.1 The flood study process and scope of this project 10 2.2 Study area 10 2.3 Key stakeholders 11 3. Catchment and data review 13 3.1 Catchment overview 13 3.2 Recorded flood history and streamflow gauging 15 3.3 Previous flood studies and investigations 18 3.4 Topographic and spatial data 18 4. Hydrologic data review 20 4.1 Rainfall data 20 4.2 Streamflow data 23 4.2.1 Baseflow separation 23 4.2.2 Flood frequency analysis 25 4.2.2.1 Qualandary Crossing 26 4.2.2.2 Walyunga 29 4.2.2.3 Whiteman Road 38 4.3 Craignish 39 4.4 Modelling philosophy 42 5. Hydrological model development 45 5.1 RORB model development 45 5.2 Effect of anabranched channels 49 5.3 Yenyenning Lakes 52 5.4 Lakes Hinds and Ninan 56 5.5 Mundaring Dam 60 6. Model calibration 63 6.1 Selection of calibration events 63 6.2 Selection of loss model 63 6.3 January 2000 event 67 6.3.1 Rainfall inputs 67 6.3.2 Streamflow data 70 6.3.3 Calibration results 74 6.4 July 1983 event 87 6.4.1 Rainfall inputs 87 1 EMR00001_R_SwanHelenaHydrology_Final_version3.docx Swan and Helena Rivers Flood Study: Hydrology 6.4.2 Streamflow inputs 90 6.4.3 Calibration results 91 6.5 July 1974 event 98 6.5.1 Rainfall inputs 98 6.5.2 Streamflow inputs 101 6.5.3 Calibration results 103 6.6 July 1946 event 107 6.7 Summary of calibration parameters 111 7. Method for design flood modelling 118 7.1 Event based and Monte-Carlo approaches 118 7.2 Overview of adopted joint probability framework 120 7.3 Seasonality 122 8. Design inputs 123 8.1 Lower catchment 123 8.1.1 Burst depths 123 8.1.2 Pre-burst 125 8.1.3 Spatial patterns 126 8.1.4 Temporal patterns 126 8.2 Complete catchment 126 8.2.1 AWAP burst depths 126 8.2.2 BoM burst depths 129 8.2.3 Comparison of methods 130 8.2.4 Burst depths for AEPs from 1% to 0.05% 132 8.2.5 Probable maximum precipitation 133 8.2.6 Pre-burst 134 8.2.7 Spatial patterns 134 8.2.8 Temporal patterns 134 8.3 Helena River catchment 134 8.3.1 Burst depths 134 8.3.2 Pre-burst 137 8.3.3 Spatial patterns 138 8.3.4 Temporal patterns 138 8.4 Losses 138 8.5 Lake and reservoir starting levels 139 8.5.1 Mundaring Dam 141 8.6 Baseflow 142 9. Model verification 144 9.1 Approach 144 9.2 Lower and complete catchment results 144 2 EMR00001_R_SwanHelenaHydrology_Final_version3.docx Swan and Helena Rivers Flood Study: Hydrology 9.3 Helena River catchment 148 9.4 Adopted loss parameters 149 10. Design flood hydrology 152 10.1 Modelling results 152 10.1.1 Swan River at Walyunga 152 10.1.2 Helena River at Whiteman Road 155 10.2 Climate change 157 10.3 Probable maximum flood 157 11. Conclusion 160 12. References 161 3 EMR00001_R_SwanHelenaHydrology_Final_version3.docx Swan and Helena Rivers Flood Study: Hydrology Glossary Anabranching Splitting or bifurcation of a river channel into a number of smaller, generally parallel channels. Annual exceedance Estimate of the probability of a rainfall or flood event occurring in probability (AEP) any given year. Typically measured as a percentage (e.g. X %), but other terminology such as 1 in X AEP or X year ARI have been used in the past. Attenuation The decrease in peak flow and increase in flood duration associated with the movement of a flood hydrograph along a river or through a storage such as a lake or a dam. Australian Height Datum Vertical datum for elevation measurements – approximately equal (AHD) to mean sea level. Australian Rainfall and The national flood estimation guidelines for Australia, published by Runoff (ARR) Engineers Australia. The previous version was released in 1987, and this project coincided with the partial release of the new version in December 2014. AWAP Gridded daily rainfall data over all of Australia covering the period 1900 to current. Provided by the Bureau of Meteorology and formally known as Australian Water Availability Product. Baseflow The volume of water which enters a stream after travelling through the soil profile. Not included as surface runoff. CRC-FORGE A statistical technique used to estimate rainfall intensity-frequency- duration up to an AEP of 0.05% (1 in 2,000). Design flood Hypothetical flood which has a defined annual exceedance probability. Design rainfall Hypothetical rainfall event which has a defined annual exceedance probability. Flood frequency analysis Statistical analysis of gauged flood data to estimate annual exceedance probabilities at a gauge location. Flood hazard A measure of the force associated with flood water at a point – typically defined as flood depth times flood velocity. 4 EMR00001_R_SwanHelenaHydrology_Final_version3.docx Swan and Helena Rivers Flood Study: Hydrology Flood routing Process of transferring a flood hydrograph along a river channel, which results in a degree of attenuation based on the characteristics of the channel. Flood study Technical input to the floodplain management process which includes estimation of design flood flows, water levels, flood extents, flood hazard and flood damages. Flood mapping The process of determining the extent and depth of flood waters based on a defined flow rate. Flow The volume of water passing a defined point, typically measured in cubic metres per second (m3/s). Full supply level The water level of a dam above which outflows commence. Gauging station Site where water level is measured and converted into streamflow using a rating curve. GIS Geographic Information Systems. Software and computer analysis techniques used to store, display and analyse geographic data. GSDM Generalised Short Duration Method. The procedure for estimating the short duration probable maximum precipitation depth. GTSMR Generalised Tropical Storm Method Revision. The procedure for estimating the long duration probable maximum precipitation depth in tropical regions. GEV Generalised Extreme Value distribution. A type of statistical probability distribution. Initial loss The volume of rainfall lost at the start of a storm event – typically represents interception by vegetation and wetting of the upper soil layers. LiDAR Light Detection and Ranging. A digital elevation model captured from aerial survey, typically by an aircraft or satellite. LPIII Log Pearson III distribution. A type of statistical probability distribution. 5 EMR00001_R_SwanHelenaHydrology_Final_version3.docx Swan and Helena Rivers Flood Study: Hydrology Monte Carlo simulation Method of hydrological modelling where the model inputs (e.g. rainfall depth, loss rate, reservoir starting level) are sampled from probability distributions. Pluviometer Rainfall station which records rainfall at a sub-daily timestep (typically 6 minute timestep). Pre-burst rainfall Rainfall which occurs prior to the main rainfall burst in a design storm. Probable maximum flood Estimate of the largest flood which can be reasonably expected to (PMF) be generated from a particular catchment given the maximum rate of rainfall for that duration and season. Probable maximum The hydro-meteorological estimate of the most intense rainfall that precipitation (PMP) could theoretically be considered to occur over a catchment. Proportional loss An ongoing loss of rainfall throughout a storm event, measured as a percentage of the rainfall depth in each timestep. Rainfall intensity- Estimates of the intensity of design rainfall over a range of storm frequency-duration (IFD) durations and for a range of annual exceedance probabilities Rating curve Gauge-specific relationship which is used to convert gauged water level into streamflow. RORB Hydrological model used to estimate streamflow based on historic or design rainfall inputs. Runoff The volume of rainfall which falls on a catchment and runs off into the stream network – excludes losses from soil absorption, evaporation and other processes. Runoff coefficient Measure of the proportion of rainfall which is converted into runoff throughout the duration of a storm event.
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