Performance of HEC-RAS v6.5 at basin scale for calculating the flow hydrograph: comparison with TUFLOW

Pasqualino Artiglieri, Giuseppe Curulli, Francesco Coscarella (), Danilo Algieri Ferraro and Francesco Macchione
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Pasqualino Artiglieri: University of Calabria
Giuseppe Curulli: University of Calabria
Francesco Coscarella: University of Calabria
Danilo Algieri Ferraro: University of Calabria
Francesco Macchione: University of Calabria

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2025, vol. 121, issue 8, No 21, 9477-9490

Abstract: Abstract This study investigates the efficiency of the HEC-RAS v6.5 hydrodynamic model at basin scale in calculating flow hydrographs, comparing its performance with the TUFLOW model. The research examines the Fosso di Mare basin in Calabria, Italy, by using structured grids with varying resolutions (5 m, 10 m, and 20 m). The study evaluates the impact of grid resolution on the accuracy of flood hydrographs generated by HEC-RAS, using results generated with TUFLOW as benchmarks. The results indicate that the peak flow computed using HEC-RAS estimates decreases with lower grid resolutions, while the time of the peak flow increases, suggesting the occurrence of a numerical storage effect within the computational domain. TUFLOW demonstrates more stability and requires significantly less computational time, making it suitable for large-scale studies. This research offers valuable insights for hydraulic design and flood risk assessments, particularly in regions with limited resources for commercial hydrodynamic models.

Keywords: HEC-RAS; TUFLOW; Rain-on-grid models; Runoff simulations; Flow hydrograph (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1007/s11069-025-07170-x

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