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 80 The area between the Airport and Colonel Rose Drive is partially inundated to shallow depths by water which drains in a south-easterly direction after overflowing Colonel Rose Drive. The airport buildings and runway are flood free, as floodwaters are diverted by Santa Theresa Road. 10.3.2 50 Year ARI Flood Figure A.2 shows the extent of flooding and the flood depths for the 50 Year ARI design flood. The following is of note: Some overflow of floodwaters occur from the Charles River channel upstream of Herbert Heritage Drive, inundating low lying areas on the western banks, and overtopping the Stuart Highway. Charles River floodwaters also overtop the Stuart Highway in some locations in Braitling. Floodwaters overflow the eastern bank of the Todd River at the Wills Terrace causeway inundating parts of Undoolya Road and Lindsay Avenue to shallow depths. Todd River floodwaters also overflow west into the Alice Sprigns CBD before flowing south towards Gap Road. Some properties between the CBD and river may be inundated to depths of up to 0.5m above ground level. Floodwaters from the Todd River back up into and inundate the Undoolya Swamp northeast of the Stott Terrace Bridge. The properties on the eastern bank at the Stott Terrace bridge are inundated to depths of up to 1m above ground level. Significant breakout of floodwater occurs south of the Stott Terrace bridge inundating properties on the western bank to Gap Road. Significant inundation of properties on the east and west overbanks occurs south of the Tuncks Road causeway. The Stuart Highway at Heavitree Gap would be inundated by up to 0.9m and would not be trafficable. The Stuart Highway and Gap Road would be inundated and potentially non-trafficable in some parts as far north as the hospital grounds. Between Heavitree Gap and the Ross Highway bridge, floodwaters are generally confined within the Todd River channel. The Ross Highway would be inundated to depths of up to 0.7m south of the bridge. South of the bridge there is significantly more over bank flooding for the 50 year ARI flood when compared to the 20 year ARI flood. Floodwater overflows from the western bank of the Todd River immediately upstream of Ilyiperenye Hill, combining with water overflowing from Ilparpa Swamp and draining south along the St Marys Creek channel. The Ilparpa Swamp flows overtop the railway line to the south of Ilparpa Road and inundate the Stuart Highway to shallow depths (0.2m). The highway would likely still be trafficable at the peak of the event. St Marys Creek flood path is relatively confined until it spreads out upstream of Colonel Rose Drive. Overbank flooding of the AZRI site and rural residential area on Colonel Rose Drive is substantially increased compared to the 20 Year ARI flood. Much of the Ross Highway downstream of Stegar Road is inundated, as is Baldiserra Drive and Heenan Road. The Amoonguna settlement is generally flood free. Floodwater draining south from Colonel Rose Drive converges east of the Airport. The Airport buildings and runway are not inundated by Todd River floodwater.


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