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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-1 1. INTRODUCTION Under the Northern Territory Government's Interim Flood Plain Management Policy (1980) 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 the designated flood. In 1984, flood studies were carried out by the Snowy Mountains Engineering Corporation (SMEC). Following the production of 1 in 20, 1 in 50 and 1 in 100 AEP flood maps, based on the SMEC studies, it was recommended to the Flood Plain Management Committee that the 1 in 100 AEP flood be adopted as the designated flood. Lands Department representatives on the Committee, questioned the apparent inconsis'tencies between the' previously used levels (based on the 1957 flood) and the newly mapped 1 in 100 AEP flood levels. Levels in the river, on the right bank flood plain and upstream of the railway on the left bank, were 0.05m to 0.03m above 1957 flood levels. On the left bank downstream of the railway, the mapped levels exceeded the 1957 flood record by 0.80m. Water Resources Division agreed to investigate the apparent discrepancies by firstly examining all records of the 1957 flood, particularly in the left bank downstream area, to confirm their accuracy. In the event of the record being found correct it was agreed that the model would be re-examined and if necessary re-calibrated, to give results consistant with the 1957 flood record. DHE2:57

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