PC-IHACRES is a rainfall-runoff model. It uses a transfer function/unit hydrograph (UH) method for catchment-scale (spatially lumped) continuous simulation. River and meadow


PC-IHACRES can assist hydrologists and water resource engineers. Its applications include:

  • investigations in small catchments instrumented for special studies
  • regional studies using larger catchments
  • quality assurance of strategically important streamflow and rainfall records.

PC-IHACRES can be used in higher education as a teaching aid for unit hydrograph theory and application.

It was developed jointly by the Centre for Ecology & Hydrology and the Centre for Resource and Environmental Studies at the Australian National University.

Key features and uses include:

  • identification of unit hydrographs (UHs)
  • continuous time series streamflow modelling
  • environmental impacts detection - hydrological regime studies
  • runoff event modelling
  • hydrograph separation (e.g. to assist with water quality investigations)
  • derivation of a Slow Flow Index (SFI), analogous to Base Flow Index (BFI)
  • derivation of Dynamic Response Characteristics (DRCs)
  • DRC - Physical Catchment Descriptor (PCDs) studies (regionalization)
  • teaching aid for unit hydrograph (UH) theory and its applications
  • hydrometric data quality assurance/control (QA/QC)
  • infilling missing streamflow data

PC-IHACRES flow chart


The PC-IHACRES software is available to download free of charge. The download includes the 94-page user guide with tutorials and other documents.

Download CEH software


Science areas: