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 61 The surrounding houses that were built up were not inundated. Water flowed from Parakelya Road to Chateau Road (not build at time of flood) to Sharber Road. Looking west from the block, the water covered the adjacent AZRI area. Water crossed Colonel Rose Drive at the southern end at several locations along the southern edge of the subdivision (See Figure 7.13). GHD (2001) provides a description of the observed areas of floodplain inundation north of Heavitree Gap based on eyewitness accounts. A summary of the observed extent of inundation is as follows: The Todd Street mall was inundated during the 1988 flood event, however the actual depth of inundation was shallow. The Todd River did not overflow into residential properties on the eastern bank of the river north of Will Terrace, however water did back up into the Undoolya Swamp area, located on the eastern side of the river, north of the Stott Terrace bridge. Breakout of floodwaters occurred along the western bank of the river south of the Stott Terrace bridge, with floodwaters draining south along roadways towards Heavitree Gap. Gap Road and parts of the hospital grounds (immediately west of Tuncks Road) were inundated. Photographs taken from Heavitree Gap indicate that widespread inundation occurred south of Acacia Street. Floodwaters also backed up along Telegraph Terrace and Gap Road at least as far as Achilpa Street and Kempe Street. The predicted 1988 flood extent and flood depths in the over bank area to the south-west of the Todd River is generally consistent with the anecdotal evidence of the flood behaviour. The predicted depth and extent of overbank flooding generally correlates well to the observed extent of flooding provided in GHD (2001).


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