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 44 6 HYDRAULIC MODEL DEVELOPMENT 6.1 GENERAL The TUFLOW two-dimensional unsteady flow model (WBM, 2010), was used to estimate design flood levels and flood velocities along the Todd River and its floodplain through Alice Springs and the downstream rural area. TUFLOW estimates flood levels and velocities on a fixed grid pattern by solving the full two-dimensional depth averaged momentum and continuity equations for free surface flow. It also incorporates a one-dimensional or quasi two-dimensional modelling system (ESTRY). The one-dimensional (ESTRY) and two-dimensional (TUFLOW) schemes are solved independently, but are dynamically linked at the boundary to ensure continuity (mass) is conserved. 6.2 TUFLOW MODEL CONFIGURATION 6.2.1 Model Configuration Figure 6.1 shows the extent of the TUFLOW model, the locations of the 2D inflow and outflow boundaries and the locations of the hydraulic structures. The upstream boundaries of the model are located on the Charles River at Irlpme, about 5.7km north-west of the Alice Springs CBD, and on the Todd River about 2km north of the Schwarz Crescent causeway. The model extends approximately 16.3km downstream of the confluence of the Todd and Charles rivers, some 4.6km south-east of the Amoonguna settlement. A 20 m grid has been adopted for the two dimensional model area. That is, flood levels and velocities are estimated every 20m across the entire floodplain. 6.2.2 Hydraulic Structures Table 6.1 and Table 6.2 provide details of the major hydraulic structures included in the hydraulic model. The locations of the structures are shown in Figure 6.1. No design data was available for these structures for use in the study. Details of these structures were obtained through visual inspections during the site visit and an interrogation of survey data supplied by the Department of Planning and Infrastructure. All culverts, with the exception of the Taffy Pick causeway (HS 8), were modelled as 1D structures. All low level causeways were modelled in the 2D domain, with deck levels adopted from the DEM. The Wills Terrace pedestrian bridge (HS 1), Stott Terrace bridge (HS 3), Taffy Pick causeway (HS 8) and the Ross Highway bridge (HS 16) were modelled as layered flow constrictions in the 2D domain.


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