STEDI is a water balance model that uses information such as streamflows, dam sizes, dam location, water use demands, rainfall and evaporation to simulate individual dams within a catchment.
STEDI can be used to estimate:
- How existing farm dams impact streamflows;
- How new farm dams would impact streamflows.
The user can enter as much information about dam size, catchment areas and on-farm demands as is available. STEDI also allows the user to spatially configure a network of dams in a catchment so that inflows are influenced by upstream dams.
STEDI can run at a daily, weekly, or monthly timestep, and given the proper inputs can model:
- Low flow bypasses around farm dams;
- Farm dams that are manually 'topped-up' by pumping, for example from a local watercourse;
- Changes in water use demands; and
- The effects on flows from one dam to another through the catchment.
STEDI is distributed as public domain software and can be downloaded free of charge.
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STEDI has been developed and tested by Jacobs, formerly Sinclair Knight Merz (SKM), in partnership with the DELWP. Program maintenance and limited user support is provided by Jacobs.
The public release of STEDI responds to widespread concerns about the possible impact of farm dams on water entitlements and environmental flows, and the growing need to accurately represent farm dam impacts in the face of climate change.
The concepts underpinning STEDI are discussed in two companion papers published in the July 2005 issue of the Australian Journal of Water Resources.