Territory Stories

1985 revision of flood plain mapping - Katherine



1985 revision of flood plain mapping - Katherine


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


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




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


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




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

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Water Resources Division, Dept of Mines and Energy

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various pagings : ill., maps ; 30 cm.

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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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