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 58 7.3.2 Surveyed Debris Marks A comparison between surveyed debris marks and predicted water levels at various locations along the Charles and Todd rivers is provided in Table 7.2. Flood levels are also plotted in Figure 7.10, Figure 7.11 and Figure 7.12. Generally, a good correlation is achieved between surveyed debris marks and predicted water levels in the Todd River, particularly downstream of the Schwarz Crescent causeway. The model appears to over-predict water levels in the Charles River, however as for the 1983 calibration event, this may be due to the URBS model overestimating discharges in the Charles River. The excellent fit against surveyed debris marks immediately upstream and downstream of the Heavitree Gap stream gauge is of note in contrast to the over predicted levels at the Heavitree Gap gauge. The close fit to the nearby surveyed data indicates that the recorded water levels at the gauge may be in error. Table 7.2 Summary of Surveyed Debris Marks and Predicted Water Levels, March / April 1988 Flood Event Location Surveyed Debris Level (m AHD) Predicted Water Level (m AHD) Difference (m) Charles River Dixon Road 590.37 590.51 0.14 US Herbert Heritage Drive 589.71 590.20 0.49 DS Herbert Heritage Drive 589.39 589.51 0.12 Head Street 586.40 586.59 0.19 Kekwick Avenue 583.82 583.89 0.07 Woods Terrace 583.14 583.18 0.04 Hele Crescent 581.58 581.72 0.14 Smith Street 580.47 580.68 0.21 Ulpaya Road 579.64 579.68 0.04 Todd River US Schwarz Crescent 579.18 578.95 -0.23 DS Schwarz Crescent 579.04 578.77 -0.27 Mills Street 578.53 578.50 -0.03 Anzac Oval Stream Gauge 578.50 578.46 -0.04 Renner Street 578.17 578.27 0.10 US Wills Terrace 577.86 877.85 -0.01 DS Wills Terrace 577.68 577.61 -0.07 Parsons Street 577.04 577.03 -0.01 Gregory Terrace 576.56 576.59 0.03 US Stott Terrace 576.42 576.39 -0.03 DS Stott Terrace 575.53 575.66 0.13 Tuncks Road 574.77 574.78 0.01 Bagot Street 574.46 574.65 0.19 Benstead Street 573.92 573.93 0.01 Breaden Street 572.78 572.73 -0.05 Strehlow Street 572.07 572.15 0.08 Kempe Street 571.32 571.31 -0.01 US Stephens Road (Taffy Pick) 570.89 570.89 0.00 DS Stephens Road (Taffy Pick) 570.66 570.63 -0.03 Walker Street 569.71 569.81 0.10 Heavitree Gap 568.15 568.13 -0.02 Heavitree Gap Stream Gauge 566.59 567.19 0.60 DS Ross Highway Bridge 563.56 563.52 -0.04 Ilparpa Road 562.46 562.43 -0.03


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