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 20 4 CALIBRATION AND VERIFICATION EVENTS 4.1 ADOPTED CALIBRATION AND VERIFICATION EVENTS During the period of record, reliable rainfall and stream flow data are available for 14 flood events of varying degrees of magnitude. The earliest event in the period of record is the December 1981 flood event and the most recent event is the April 2010 flood event. Table 4.1 shows details of the duration and magnitude of the flood events. The March 1983, March/April 1988 and April 2000 flood events were adopted for model calibration, and the remaining 11 events were adopted for model verification purposes. It should be noted that although the hydraulic model was calibrated against the March 1983, March/April 1988 and April 2000 events, it was only validated against the January 2010, February / March 2010 and April 2010 flood events. Table 4.1 Adopted Calibration and Verification Events, Todd River Catchment Flood Event Approx. Event Duration Wigley Gorge Anzac Oval Heavitree Gap Start End Peak Flood Level (mGH) Peak Discharge (m3/s) Peak Flood Level (mGH) Peak Discharge (m3/s) Peak Flood Level (mGH) Peak Discharge (m3/s) Calibration March 1983 12/03/1983 20/03/1983 5.52 840 3.43 728 2.03 1008 March/April 1988 29/03/1988 03/04/1988 5.83 1045 3.99 1162 2.16 1181 April 2000 14/04/2000 28/04/2000 4.43 364 3.22 554 n/a n/a Verification December 1981 12/12/1981 15/12/1981 3.09 144 2.80 218 1.32 333 January 1984 24/01/1984 30/01/1984 5.20 667 3.23 566 2.01 982 January 1991 23/01/1991 27/01/1991 4.78 480 3.03 352 1.44 413 March 1995 03/03/1995 08/03/1995 4.06 287 2.93 283 1.26 296 February 1997 08/02/1997 18/02/1997 2.94 126 2.59 156 0.94 140 December 1999 16/12/1999 18/12/1999 2.94 126 2.50 134 0.93 135 January 2001 27/01/2001 31/01/2001 2.19 55 2.68 184 1.16 242 November 2008 18/11/2008 20/11/2008 3.50 196 2.57 152 n/a n/a January 2010 07/01/2010 12/01/2010 3.27 166 2.86 243 1.21 268 February/March 2010 24/02/2010 02/03/2010 2.49 81 2.61 162 1.04 183 April 2010 09/04/2010 12/04/2010 2.89 121 264 172 0.96 150


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