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This study focuses on a comprehensive understanding of the NID’s hydro-climatological functioning using water balance model approach to develop NIDWat. After a clear description of the water budget’s elements specific to the NID catchment, a spatial and temporal dynamics of the annual flood across the NID over the period 2000-2009 was performed using microwave radar data from satellite QuickSCAT. The estimated areas were used along with observed discharge and remotely-sensed climatic data to quantitatively evaluate each water balance component. The NIDWat model was validated against observed river discharge and water abstractions and shows a good performance.

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