The EIA IWRM Models

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The IWRM Model is a hydrological river basin model. It takes land use, soil, DEM and hydromet data as input, computes water flow, water discharge and bio-geo-physical indicators and presents result as GIS / DSS ready maps, charts and animations.             

The IWRM model consists of the base distributed hydrological model and several coupled components. Each component is flexible so that management alternatives can be incorporated into the model and assessed. 

  • Hydrology which enables analysis of the impact of land use changes, water conservation measures and climate change;
  • River flow which enables analysis of water availability, hydropower operations, flooding and flood management;
  • Sediments and erosion which enables analysis of soil conservation measures and reservoir sediment trapping;
  • Reservoir operations which enables analysis of the impact of construction and operation of reservoirs and other water storage infrastructure; and
  • Irrigation and crop yield which enables analysis of new crop areas and altering irrigation and crop planting regimes for existing areas.


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The IWRM 3D is fully three-dimensional (3D) hydrodynamic model for lakes, rivers and coastal waters.  The model describes detailed 3D characteristics of the water flow; water quality; flooding; impacts on infrastructure, cooling water spreading, release, transport and reactions of sediments, nutrients or other substances; and algae growth.

Output is GIS / DSS ready maps, charts and animations.


Key model features