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ISIS was the core modelling tool used within the Rio Salado Master Plan project in Argentina

The Flood Modeller 1D solver was the core modelling tool used within the Rio Salado Master Plan project in Argentina.

The World Bank funded project developed a master plan which identified a programme of works to reduce the negative impacts of flooding, improve economic conditions in the catchment and protect and enhance the environment.

The study area was the 170,000km2 Rio Salado Catchment to the south and west of Buenos Aires – an economically important area producing about 25% of the Argentine output of grains and meat. The catchment is generally very flat (La Pampa) and suffers from prolonged flooding and waterlogging.

A broad-scale 1D model was developed for approximately 2,500 km of channels. The model was calibrated using observed data from a number of gauging stations and using historic flood extents.

The model enabled identification of priority areas and appraisal of interventions to enhance the economic and environmental conditions.

In order to better understand the interaction between groundwater and surface water, a coupled 1D and MODFLOW model was developed for local areas (MODFLOW is a popular three-dimensional groundwater model from the US Geological Survey).

The coupling involves MODFLOW solving the groundwater flow equation and providing the groundwater heads that our 1D solver uses to calculate the corresponding leakage based on the water level of the surface water body. The leakage is exported back to MODFLOW and the groundwater heads are recomputed. The iteration between both programs stops when the difference between two successive leakage volume calculations is less than a specified tolerance.

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