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May 7, 2026Journal of Hydrology Regional StudiesOpen Access

Floodplain inundation modeling and mapping using integrated HEC-HMS and HEC-RAS model on Dirma River Watershed, Lake Tana Basin, Ethiopia

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Authors

FFFitamlak T. FikadieBABanteamlak K. AbebeABAbreham M. Belete

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Overview

Floodplain inundation modeling reveals risk management strategies for the Dirma River watershed, indicating a need for integrated approaches.

Key Points

  • The aim is to model and map floodplain inundation in the Dirma River watershed for effective risk management.
  • Floodplain inundation modeling conducted using HEC-HMS and HEC-RAS models.
  • Data sources included hydro-meteorological, geometric, and spatial datasets gathered from measurements and governmental data.
  • Flood frequency analyzed with EasyFit software; model calibration (2000–2013) and validation (2014–2020) conducted.
  • Flood extent ranged from 9.58 km² (2-year return period) to 11.68 km² (100-year return period).
  • Model validation demonstrated strong performance with R² values between 0.82 and 0.87 and NSE values of 0.73 to 0.78.
  • Findings support the need for integrated flood management and sustainable land-use practices, including afforestation.

Cite This Study

Fikadie et al. (2026) studied this question.

synapsesocial.com/papers/69fbf004164b5133a91a44bchttps://doi.org/10.1016/j.ejrh.2026.103475
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