Territory Stories

Alice Springs Flood Investigation and Floodplian Mapping Study

Details:

Title

Alice Springs Flood Investigation and Floodplian Mapping Study

Creator

WRM Water & Environment Pty Ltd; Northern Territory. Department of Lands, Planning & the Environment

Editor

Roads, Greg

Collection

E-Publications; PublicationNT; E-Books; EXTA1463

Date

2015-10-12

Location

Alice Springs

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).; WRM Water & Environment (WRM) was commissioned by the Department of Lands & Planning (DLP) to undertake a flood study of the Todd River in the Alice Springs area. The aim of the study is to develop a 2 dimensional flood model, which allows flood flow in a complex flood plain to be modelled, to determine the extent and severity of riverine flooding in the town of Alice Springs and the Alice Springs rural area south of Heavitree Gap. The purpose of the study is to produce floodplain maps of the Alice Springs and its rural area for land use planning and counter – disaster purposes. This study is an extension of the Alice Springs Farms Area Floodplain Mapping Study (WRM, 2006), undertaken by WRM on behalf of the Department of Planning & Infrastructure in 2006 in order to develop detailed Todd River floodplain maps for the rural area south of Alice Springs.

Table of contents

1. INTRODUCTION -- 2. CATCHMENT DESCRIPTION -- 3. AVAILABLE DATA -- 4. CALIBRATION AND AND VERIFICATION EVENTS -- 5. HYDROLOGIC MODEL CALIBRATION AND VERIFICATION -- 6. HYDRAULIC MODEL DEVELOPMENTLOPMENT -- 7. HYDRAULIC MODEL CALIBRATION -- 8. FLOOD FREQUENCY ANALYSIS -- 9. DESIGN EVENT HYDROLOY -- 10. DESIGN FLOOD LEVELS AND EXTENTS -- 11. CONCLUSION -- 12. REFERENCES

Language

English

Subject

Flood control -- Northern Territory -- Alice Springs; Flood damage prevention -- Northern Territory -- Alice Springs; Floodplain management -- Northern Territory -- Alice Springs; Alice Springs Flood Investigation; Floodplain Mapping

Publisher name

WRM Water & Environment Pty Ltd

Place of publication

Darwin (N.T.)

Series

EXTA1463

Format

vii, 95 pages : colour maps ; 30 cm.

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/259732

Citation address

https://hdl.handle.net/10070/494349

Page content

0269-02-C1 12 October 2015 67 Water Year Ending Month of Peak Wigley Gorge (G0060046) Anzac Oval (G0060009) GH (m) Discharge (m3/s) GH (m) Discharge (m3/s) 1994 Oct 2.98 131 2.53 141 1995 Mar 4.06 287 2.93 283 1996 Dec 1.81 30 1.80 18 1997 Feb 2.94 126 2.59 156 1998 Apr 2.38 71 2.21 71 1999 Nov 1.82 30 1.86 24 2000 Apr 4.43 364 3.22 554* 2001 Nov 2.52 84 2.68 184 2002 Dec 2.62 94 2.32 92 2003 Nov 2.24 59 2.09 51 2004 May 1.17 8 1.54 6 2005 Jul 0.45 0.03 no flow 2006 Oct 1.56 18 1.80 18 2007 Jan 2.90 122 2.53 141 2008 no flow no flow 2009 Nov 3.50 196 2.57 152 2010 Jan 3.27 166 2.86 243 2011 Jan 1.15 8 1.80 18 * Indicates peak discharge adjusted based on adopted G0060009 rating curve. Table 8.2 Peak Flood Discharge Estimates, Todd River at Wigley Gorge and Anzac Oval AEP (%) ARI (Years) Peak Discharge (m3/s) Wigley Gorge Wills Terrace/Anzac Oval 5.0 19.5 689 724 2.0 50 1071 1103 1.0 100 1428 1447 8.4 COMPARISON WITH PREVIOUS STUDIES Three previous studies (Barlow, 1988; GHD, 1996; WRM, 2006) have undertaken FFA for Todd River stations. GHD (1996) and WRM (2006) analysed data for both Wigley Gorge and Anzac Oval stations, but Barlow (1988) analysed data for Anzac Oval only because the Wigley Gorge record at the time of that study was considered too short for analysis. Table 8.3 compares the FFA estimates of these three previous studies with the results of the current study. When comparing these results, it should be noted that the current study used 17 more years of data than the GHD (1996) study and 25 more years of data than the Barlow (1988) study. The Anzac Oval (G0060009) rating curve used to derive the peak discharges has also been adjusted for this study, as described in Section 3.4.