Territory Stories

1985 revision of flood plain mapping - Katherine

Details:

Title

1985 revision of flood plain mapping - Katherine

Creator

Barlow, F. T. H. (Frederick Thomas Harvey)

Collection

E-Publications; E-Books; PublicationNT; 08/86D

Date

1986-02-26

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:1986; Report (Northern Territory. Water Resources Division, Dept of Mines and Energy) ; 8/1986.

Language

English

Subject

Floods -- Northern Territory -- Katherine; Floodplain management -- Northern Territory -- Katherine

Publisher name

Water Resources Division, Dept of Mines and Energy

Place of publication

Darwin

Series

08/86D

Format

various pagings : ill., maps ; 30 cm.

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/229366

Citation address

https://hdl.handle.net/10070/673062

Page content

1 BACKGROUND Under the Northern Territory Government's Interim Flood Plain Management policy, the 1957 flood is the designated flood for the Town of Katherine. In all other flood prone areas of the Territory, the 1 in 100 flood is used. Following flood studies carried out by SMEC, and the production of 1 in 100, 1 in 50 and 1 in 20 year flood maps, it was recommended to the Flood Plain Management Committee that the 1 in 100 year flood be adopted as the designated flood. Lands Department representatives on the Committee, questioned the apparent inconsistencies between the previously used levels (based on the 1957 flood) and the mapped 1 in 100 levels. Levels in the river, on the right bank flood plain and upstream of the railway on the left bank, were 0.05 to 0.03 above 1957 levels. On the left bank downstream of the railway, the mapped levels exceeded the 1957 record by 0.80m. Water Resources Division agreed to investigate the apparent discrepancies by: a) Checking as far as possible the accuracy of the 1957 flood height records, particularly in the left bank downstream area. b) If the differences were not explained by errors in the record, to re-examine the flood modelling, and if necessary, re calibrate the model to consistently reproduce the 1957 record. DME2:57