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

I I I I I I I I I I I I I I I I I I On the basis of actual gauged records, it can be argued that the 1957 flood represents a 1 in 100 event. It can-also be stated that nothing appreciably larger has been experienced since European settlement of the area. On this basis the 1957 levels are appropriate to map as the 1 in 100 flood. Alternatively the more conservative approach can be taken, that at least 2 floods of similar size (1957 and lB97) have occurred in the last 90 years, with the 1940 flood only slightly smaller. This argument would assign a probability of the order of 1 in 50 to the 1957 flood. On this basis the 1 in 100 peak level would be about 19.4m and the peak flow about 6300 m3 /s. Compared to the 1957 flood a flood of this magnitude would produce the following increases in level. River Right " Left " at GS B1400l bank F/plain " " bank F/plain " " u/S DiS u/S DIS +.13 +.20 +.23 +.16 +.5B The higher flood does not produce significantly higher flooding in the town area (except downstream of the railway). It is considered that as both estimates can be justified, it is preferable to adopt the one which will be acceptable by the public, rather than try to be too conservative. DME2:57


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