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 81 10.3.3 100 Year ARI Flood Figure A.3 shows the extent of flooding and the flood depths for the 100 Year ARI design flood. The following is of note: The Stuart Highway is inundated and non-trafficable due to inundation by Charles River floodwaters north of Herbert Heritage Drive. Charles River floodwaters overflow from the western bank into streets and low lying properties in Braitling. Overflowing floodwaters typically drain in a southerly direction along streets. Industrial properties along the western bank of the Charles River may be inundated. Some floodwater escapes the Charles River and flows south along the Stuart Highway towards the CBD. Floodwater overflowing from the Todd River between upstream of Wills Terrace inundates streets and low lying properties in the Eastside area. Overflowing floodwater generally drains south along Lindsay Avenue towards Undoolya Swamp. Lindsay Avenue is inundated by depths of up to 0.4m and may no non-trafficable. Significant volumes of floodwater overflow south of Wills Terrace, draining into the Todd Mall and inundating the majority of the CBD to depths of up to 0.5m. Extensive backwater flooding occurs on the eastern overbank upstream of the Stott Terrace bridge. Floodwaters extend east across Stott Terrace to Sadadeen Road, inundating Undoolya Swamp and some properties located between Stott Terrace and Undoolya Road. Floodwaters extend around the western approaches to the Stott Terrace bridge, inundating properties between Gap Road and the Todd River by up to 0.7m. Overflowing floodwaters drain south, extending to the railway. Extensive overbank flooding occurs along the eastern side of the Todd River between the Tuncks Road and Stephens Road causeways. The Convention Centre and Casino are inundated to depths of up to 0.5m, along with most properties along Barrett Drive. Properties south of Stephens Road are generally flood free. The urban areas south of Traeger Park is almost completely inundated to depths of up to 0.8m. Some high ground between Walker Street and Stephens Road may be flood free. The Stuart Highway and railway embankment upstream of Heavitree Gap are inundated and impassable. The Stuart Highway is inundated as far north as Traeger Park. Backwater flooding into Chinaman Creek and the stormwater drains adjacent to the railway inundates Bradshaw Drive, which becomes non-trafficable. Properties in this area are inundated by depths of up to 1m. South of Heavitree Gap, floodwaters overflow from the Todd River between the Palm Circuit causeway and Ross Highway bridge. On the western overbank, overflowing floodwater drains south along the railway embankment before overtopping the Stuart Highway at Ilyiperenye Hill and combining with water overflowing from Ilparpa Swamp. On the eastern overbank floodwater drains through the properties on Palm Circuit and Palm Place towards Ragonesi Road. The Ross Highway is almost completely inundated south of the bridge. Significant inundation of properties along the Ross Highway, Baldissera and Heenan Street occurs, although the Amoonguna settlement is flood free. Overbank flooding on the western floodplain is more severe, with much of the AZRI site and rural residential area inundated by depths between 0.3m and 0.6m. The St Marys Creek flood area remains confined upstream of Colonel Rose Drive, however the extent of flooding immediately upstream of the road increases. The airport buildings and runway are not inundated by Todd River floodwater.