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 48 Table 6.4 Inflow Boundary Locations in the TUFLOW Model Location URBS Reference Inflow Type Charles_In 28 Total Hydrograph N28_Inflow 28 Local Hydrograph Todd_In 21 Total Hydrograph N29_Inflow 29 Local Hydrograph N30_Inflow 30 Local Hydrograph N31_Inflow 31 Local Hydrograph N33_Inflow 33 Local Hydrograph N37_Inflow 37 Local Hydrograph N38_Inflow 38 Local Hydrograph N39_Inflow 39 Local Hydrograph N40_Inflow 33 Local Hydrograph N41_Inflow 41 Local Hydrograph N42_Inflow 42 Local Hydrograph Emily_In 54 Total Hydrograph N55_Inflow 55 Local Hydrograph N56_Inflow 56 Local Hydrograph Ilparpa_In 57 Total Hydrograph N58_Inflow 58 Local Hydrograph N64_Inflow 64 Local Hydrograph N68_Inflow 68 Local Hydrograph N67_Inflow 67 Local Hydrograph N69_Inflow 69 Local Hydrograph 6.2.5 Outflow Boundaries During model development, it was found that flood flows that overflowed the right hand bank of the Todd River drained out of the model area at the airport, along with flood discharges from St Marys Creek. Further it was determined that runoff from the Blatherskite Valley and west of the railway corridor drained south-west towards Roe Creek. Therefore, separate downstream boundaries were required along the southern extent of the model. Two dimensional water level versus discharge curves using normal depths of between 0.2% and 0.4% were adopted as the model downstream boundaries. The normal depth slope adopted at each boundary location is representative of ground slopes in the area. 6.2.6 Todd River Bed Scour Previous investigations have found that the Todd River experiences significant bed lowering during flood events. Barlow (1988) found that the bed of the river at the Anzac Oval gauge had scoured up to 3m in the deep section and about 0.5m over most of the cross section during the 1988 flood. It was found that the section was probably not completely scoured to these depths but sand movement was taking place. GHD (1996), who undertook bed mobility modelling using the Fluvial-12 numerical model, estimated scour depths of 0.3 to 0.4m increasing up to 1.9m at Heavitree Gap for the 100 year ARI flood along the Todd River through Alice Springs.


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