Territory Stories

Miscellaneous Correspondence and Data on Alice Springs Flooding 1986

Details:

Title

Miscellaneous Correspondence and Data on Alice Springs Flooding 1986

Creator

Hamlyn-Harris, D.; Galton, R. P.; Charrington, Rowan; Freyling, Ron

Collection

E-Publications; E-Books; PublicationNT; Report no. 33/1986

Date

1986-04-01

Notes

Date:1986-04

Language

English

Publisher name

Northern Territory Government

Place of publication

Alice Springs

Series

Report no. 33/1986

File type

application/pdf

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Parent handle

https://hdl.handle.net/10070/229637

Citation address

https://hdl.handle.net/10070/672763

Page content

I' I To Frol':l: I Subject I I I I I I I I I I I I I I I I DEPARTMENT OF TRANSPORT AND WORKS MINUTE DIRECTOR - SOUTHERN 'RI:GION REFERENCE: REGIONAL ENGINEER, ROADS, A/SPRINGS SOCIAL/ECOLOGICAL STUDY OF FLOODING AT ALICE SPRINGS Reference is made to your I':linute dated 26 February, 1986, seeking consideration of cost and intangible implications of 1:100, 1:50 and 1:20 year floods within the town area. It is noted you required this information before 20 Harch and I apologise for any inconvenience this tardy reply has caused. Tlhile this office can provide some comment towards tangible indirect costs, I feel an assessment of intangible damages l'lOuld be better assessed ~ other Government Departments. The estimated effects of the various flood events are: 1. 1: 20 Year Flood a) There will he increased traffic flow over the Stott Terrace bridge resulting in increasing traffic delays at the intersections on Stott Terrace. b) The Ross Highway causeway will be impassable, possibly for a period of several days. The completion of the bridge over the Todd River in May 1987 will nullify this problem. 2. 1:50 Year Flood a) The Stuart Highway will be flooded from the vicinity of Schwarz Crescent to south of Heavitree Gap, severely affecting communications within the town and between the town and the airport. b) The approaches to Stott Terrace bridge will be impassable, resulting in no communications between the East Side and the rest of the town area. These are likely to be short-term effects, as the Q50 flow exceeds the Q20 flow for a period of approximately two hours. 3. 1:100 Year Flood As for 2 above but the QI00 flow exceeds the Q20 flow for a period of approximately four hours. This is still a short-term effect, but it is envisaged that there could be significant damage to the protection works through Heavitree Gap, resulting in long-term effect upon road communications through the Gap.