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 39 5.4.4 April 2000 Flood Event Figure 5.12 and Figure 5.13 show the recorded and predicted discharge hydrographs in the Todd River at Wigley Gauge (G0060046) and Anzac Oval (G0060009) stations for the April 2000 flood event. Note that reliable discharge hydrographs at Big Dipper (G0060047), Heavitree Gap (G0060126) and Upstream Undoolya Road (G0060017) were not available for this event. The following comments are made with respect to the model results. The model has reproduced the discharge hydrograph at Wigley Gorge well. The second peak predicted by the model is not consistent with the recorded rainfall pattern (i.e. the second rain burst) (see Figure 5.12). However, it is consistent with the recorded discharge hydrograph at Wigley Gorge; The reproduction of the discharge hydrograph at Anzac Oval is considered fair. The first peak has been accurately predicted but the second peak has been under-estimated. The timing and the overall shape of the predicted hydrographs for both locations are considered generally satisfactory. The recorded discharge hydrographs at Wigley Gorge and Anzac Oval show a substantial increase in discharge (approximately 200m3/s) between these two gauging stations. It is possible that inflows from the Charles River are the cause of the increase, but without a recorded hydrograph at Big Dipper this cannot be confirmed. Figure 5.12 Recorded (R) and Predicted (C) Discharge Hydrographs, 20 - 24 April 2000, Todd River at Wigley Gorge


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