Continuous hydrologic modelling for design simulation in small and ungauged basins: A step forward and some tests for its practical use.

• A continuous hydrologic model is tested using as input a long observed rainfall time series at 10-min resolution. • The proposed continuous model is tailored for small and ungauged basin applications. • The test results confirm that continuous models can be an appealing alternative to the event-based approach. The design hydrograph estimation in small and ungauged basins represents one of the most common practices and, yet, a challenging open research topic for hydrologists. When discharge observations are not available, the practitioner is compelled to apply empirical approaches. The rational formula is slowly disappearing, while event-based approaches are more and more widespread. A step forward is represented by continuous models that have the potential to address the major drawbacks of event-based approaches. In this work we applied a continuous model specifically designed for ungauged basins (COSMO4SUB) and tested its use in conditions where typically the rational formula and the event-based approaches are applied. Results confirm that the continuous modelling is suitable for rapid and effective design simulations supporting flood hazard modelling and mapping studies. [ABSTRACT FROM AUTHOR]