This report describes the determination of the boundary of the land liable to flooding (on a 1 : 25,000 topographical map) by a 1 in 100 Annual Exceedance Probability (AEP) flood, on the Finnis River floodplain downstream of the Mt. Bennet dam site.
The 1 in 100 AEP flood peak discharge of the Finnis River at Gitchams was obtained by applying the 100 year Average Recurrence Interval (ARI) design rainfall hyetograph to the RORB model. The RORB model was calibrated using recorded catchment rainfalls and discharge records at Gitchams, for the flood events of February 1975, March 1981 and January 1981. The level reached by the 1 in 100 AEP flood at the upstream end of the floodplain (at the Mt. Bennet dam site) was estimated.
Using the estimated flood level (at the upstream end of the floodplain) and an assumed design storm tide level (at the Finnis coastal area), the boundary of the area liable to flooding by a 1 in 100 AEP flood was determined.,
Notes
Made available via the Publications (Legal Deposit) Act 2004 (NT).,
Table of contents
Introduction -- Study area -- Finnis River flood analysis - earlier studies-- Basic data -- Computation of design flood -- Floodplain mapping -- References.,
Language
English,
Subject
Floods -- Northern Territory -- Finniss River,
Finniss River (N.T.),