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
Water Resources Division, Dept of Mines and Energy
various pagings : ill., maps ; 30 cm.
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6. DISCUSSION OF RESULTS USING FLOOD FREQUENCY APPROACH. A number of flood frequency estimates have been made in the past with the following values of the 1% flood being given. Years of Peak Flow Record m3 /s Watson et al (1970) 16 8500 vlater Division (1982) 28 6500 Water Division (1984) 32 6065 Peak G.HT(m) 19.74 19.34 19.24 Stage R.L. (AHD.m) 106.1 105.7 105.6 The last two estimates vary by relatively little with respect to stage and are close to the 1957 level of 19.27m. The difference in flow is largely due to differences in the ratings used. For use with the PL2DFlow Model it is useful to derive. a frequency distribution for input or source flow at the upstream end of the model. 'I'his flow is greater than flow at the gauging station, because of flood plain flows and attenuation in the main channel. A 'source' rating was derived by running the model for a series of flows, varying from 500 m3 /s to 7000 m3 /s. The flows and corresponding peak stages are shown in Table 6(a) and plotted in Figure 6(a). using this rating a series of 33 annual peak inflows was produced and is shown in Table 6(b). A Log Pearson Type 3 distribution, fitted to this series is shown in Figure 6(b). DME2:57