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Loders Creek Catchment Hydraulic Study

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Loders Creek Catchment Hydraulic Study Loders Creek Catchment Hydraulic Study August 2016 1 Title: Loders Creek Catchment Hydraulic Study Author: Study for: City Planning Branch Planning and Environment Directorate The City of Gold Coast File Reference: WF28/44/01(P4) TRACKS #45330050 Version history Changed by Reviewed by & Version Comments/Change & date date 1.0 Draft 2.0 Update DTM 3.0 Edited 4.0 Edited Distribution list Name Title Directorate Branch Version 4 – August 18 TRACKS-#45330050-v4-LODERS_CREEK_HYDRAULIC_STUDY_2015 Page 2 of 72 Executive Summary The Loders Creek catchment is the smallest catchment (9.6km2) on the Gold Coast which experiences regional flooding. Loders Creek drains into the Broadwater system and contains small tributaries which are susceptible to breaches during heavy downpours. Loders Creek contains a small embankment dam which was constructed in the early 1970’s to mitigate flooding impacts in the lower reaches and to allow further urbanisation of the Broadwater foreshore. This Loders Creek catchment hydraulic study is the result of numerous studies undertaken over a number of years to determine a flood planning level for the catchment. This study’s output is an updated Loders Creek hydraulic model which has been used to develop a flood map for the City of Gold Coast’s City Plan 2015 designated flood level (DFL). DHI’s MIKE software suites have been used to build the hydraulic model. MIKE21 calculates complex flows and represents floodplain storage in the 2D domain whilst MIKE11 represents flow constrictions of hydraulic structures in the 1D domain. MIKE Flood was used to combine the two dynamic software platforms of MIKE21 and MIKE11. This combination is appropriate for Loders Creek as it consists of numerous structures (weirs, culverts and bridges), as well as an embankment dam. The MIKE21 2D topographical terrain is a 5m rectangular grid created from Council’s 2012 2m Digital Terrain Model (DTM) and is of sufficient size to represent the small tributaries. This DTM is a combination of Aerial Laser Survey (ALS) data conducted in 2011-12 and bathymetric surveys from various years. The hydraulic model of Loders Creek has been calibrated to the June 2005 historical flood event and verified against the January 2008 and January 2013 historical flood events at two ALERT station locations. The historical flood event simulations undertaken by the model produced reasonable replication of recorded water levels throughout the catchment. This calibrated model has been used to simulate design flood events ranging from a 2 year Average Recurrence Interval (ARI) flood event to a Probable Maximum Flood (PMF). The design runs include storm durations of 0.5, 1.0, 1.5, 3.0, 4.5, 6.0, 9.0, 12.0, 18.0, 24.0, 36.0, 48.0, 72.0 hours. The hydrology of this study for both calibration and design events are sourced from the Loders Creek Hydrological Study 2014 (Ref 17). This hydrologic study has been strongly peer reviewed by leading industry experts. The hydraulic model described in this report has been used to develop the DFL for the Loders Creek Catchment. Its results will be adopted in the 2015 City Plan Major Update 2 (Resolution G16.0726.020) as the new flood planning map. Version 4 – August 18 TRACKS-#45330050-v4-LODERS_CREEK_HYDRAULIC_STUDY_2015 Page 3 of 72 Table of Contents Executive Summary ............................................................................................................................. 3 1 Introduction ................................................................................................................................... 8 1.1 Overview .............................................................................................................................. 8 1.2 2003 Flood Planning Level .................................................................................................. 8 1.3 Assumptions and Limitations ............................................................................................... 8 1.4 Acknowledgement ............................................................................................................... 9 2 Background ................................................................................................................................. 10 2.1 Catchment Description ...................................................................................................... 10 2.2 Previous Studies ................................................................................................................ 12 2.3 Previous Studies Continued .............................................................................................. 13 3 Hydraulic Model Development ................................................................................................... 14 3.1 Overview ............................................................................................................................ 14 3.2 Software Modelling Choice ................................................................................................ 14 3.3 Software Version ............................................................................................................... 14 3.4 Hydrology ........................................................................................................................... 14 3.5 Hydraulic Modelling Approach ........................................................................................... 15 3.6 Datum ................................................................................................................................ 15 3.7 Hydraulic Model Extent ...................................................................................................... 16 3.8 Input Locations .................................................................................................................. 17 3.9 Tailwater Conditions .......................................................................................................... 18 3.10 Storm Surge Conditions ..................................................................................................... 18 3.11 Digital Elevation Model ...................................................................................................... 19 3.12 Bathymetric Surveys .......................................................................................................... 20 3.13 Model Parameters ............................................................................................................. 21 3.13.1 Floodplain Roughness ......................................................................................... 21 3.13.2 Eddy Viscosity ...................................................................................................... 23 3.13.3 Flooding and Drying ............................................................................................. 23 3.14 Structures .......................................................................................................................... 24 3.14.1 Hydraulic Structures Not in Model ........................................................................ 24 3.14.2 Culvert Data ......................................................................................................... 25 3.14.3 Bridge Data .......................................................................................................... 26 3.14.4 Bridge Set up ....................................................................................................... 28 4 Model Calibration and Verification ............................................................................................ 29 4.1 ALERT Stations ................................................................................................................. 29 4.2 Maximum Height Gauges and Historical Debris Mark ....................................................... 29 4.3 June 2005 Calibration ........................................................................................................ 31 4.4 January 2008 Calibration ................................................................................................... 34 4.5 January 2013 Calibration ................................................................................................... 35 Version 4 – August 18 TRACKS-#45330050-v4-LODERS_CREEK_HYDRAULIC_STUDY_2015 Page 4 of 72 5 Calibration Summary .................................................................................................................. 36 6 Design Floods .............................................................................................................................. 37 6.1 Introduction ........................................................................................................................ 37 6.2 Initial Water Level .............................................................................................................. 38 6.3 Design Run Setup .............................................................................................................. 39 6.4 Probable Maximum Flood .................................................................................................. 39 7 Analysis of Design Events ......................................................................................................... 40 7.1 Critical Duration ................................................................................................................. 40 7.2 Maximum Water Level ......................................................................................................
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