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A description of the last version set up by Mouelhi (2003) is given here. An example of application is presented by Mouelhi et al. (2006).
The GR1A model comprises a simple equation:

Where:

• Qk is the simulated streamflow of year k
• Pk is the observed precipitation of year k
• Pk-1 is the observed precipitation of year k-1
• Ek is the potential evapotranspiration of year k
• X is the parameter of the model to optimize