Murray-Darling Basin floodplain inundation 1 in 100 year extent

Abstract

This dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.

This dataset is the 1:100 year return period maximum flood inundation extent layer derived from The Murray-Darling Basin Floodplain Inundation Model Version 2 (MDB-FIM2). It is one of a series of fifteen floodplain inundation growth layers that were produced.

The Murray-Darling Basin Floodplain Inundation Model Version 2 (MDB-FIM2) is a historical account of floodplain inundation, as well as, a predictive tool for mapping floodplain inundation under different river flows and wetland connectivities. The MDB-FIM2 was produced from satellite imagery and other available floodplain and wetlands inundation mapping. Based on MDB-FIM1, its development has been focused on advancing methodology and improving modelling accuracy.

CAVEATS ON USE

MDB-FIM2 is a research tool. The following caveats are applied on the use of its products:

• The data are the output of a research product and, as such, does not conform to coding standards and have not been quality assured;

• The data has been produced by a regional-scale model at 500 m resolution and is not accurate at site-scale;

• The inundation patterns have been derived for historical, modelled flow scenarios and cannot be directly compared to observed inundation patterns.

As such, users should apply their knowledge of the Basin when interpreting the datasets.

Purpose

Developed to map spatial extent of floodplain inundation under ecologically significant flood return periods and to derive spatial inundation patterns over time across the Murray-Darling Basin (MDB) under different climate and development scenarios.

Dataset History

The floodplain inundation growth layers, identify areas flooded for a series of flow return periods (1 in 1 year, 1 in 2 year, 1 in 5 year, 1 in 10 year, 1 in 20 year, 1 in 50 year and 1 in 100 year flow). Inundation is estimated from available 8-day MODIS composite images over the period of 2000 to 2011 and other data:

Namoi 1955-1977 flood extent (NSW DECCW)

RiM-FIM (CSIRO)

1 in 100 year Victorian flood extent (Vic DSE)

Wetlands GIS of the Murray-Darling Basin Series 2.0 (MDB maximum flood extent for 1984-1993; MDBA)

Murray River flood extent 1956 (MDBA)

The layers have been derived from the MODIS images using the open water likelihood (OWL) method developed within the Water Information Research and Development Alliance (WIRADA) between the Bureau of Meteorology and CSIRO. MDB-FIM has been granted permission by WIRADA to include this IP in the MDB-FIM product. The development of the method is described in Guerschman JP, N Sims, G Warren, T Arthur and M Colloff (2009). The inundation extent maps were linked with flow rates of different annual recurrence intervals (ARIs) at different zones within MDB (Chen et al., 2012).

Dataset Citation

CSIRO (2012) Murray-Darling Basin floodplain inundation 1 in 100 year extent. Bioregional Assessment Source Dataset. Viewed 11 December 2018, http://data.bioregionalassessments.gov.au/dataset/01f26038-daed-4ba7-b1d8-efabc749cd17.