Acta Scientiarum Polonorum
serie Formatio Circumiectus – Environmental Processes
RESEARCH PAPER
Assessment of Regional Empirical IDF and DDF Models in Southern Iran
1
Department of civil engineering, Es.C., Islamic Azad University, Estahban, Iran
2
Department of Agriculture and Forest Sciences (DAFNE), Tuscia University, 01100 Viterbo, Italy
Submission date: 2026-02-19
Final revision date: 2026-04-26
Acceptance date: 2026-05-13
Online publication date: 2026-09-17
Corresponding author
Andrea Petroselli
Department of Agriculture and Forest Sciences (DAFNE), Tuscia University, 01100 Viterbo, Italy
Department of Agriculture and Forest Sciences (DAFNE), Tuscia University, 01100 Viterbo, Italy
HIGHLIGHTS
- IMD evaluated against regional models in southern Iran
- Default n underestimates short storms; calibration improves results
- Calibration critical for <6 h rainfall; default acceptable for longer durations
KEYWORDS
TOPICS
ABSTRACT
Aim of the study:
This study aimed to evaluate and compare regional empirical IDF/DDF methods, with particular focus on the Revised IMD (RIMD) approach, for estimating design rainfall in ungauged catchments in Iran.
Material and methods:
Daily rainfall data from Baghmalek and Ahvaz were analyzed to determine the best-fit statistical distributions, develop DDF curves using four empirical methods, and assess performance using RMSE and Nash–Sutcliffe Efficiency, along with a sensitivity analysis of the IMD parameter n.
Results and conclusions:
Results showed that the default IMD value (n = 0.333) was inaccurate for short durations, while calibrated values (n = 0.39 and 0.28) significantly improved agreement with observations and produced reliable runoff estimates.
This study aimed to evaluate and compare regional empirical IDF/DDF methods, with particular focus on the Revised IMD (RIMD) approach, for estimating design rainfall in ungauged catchments in Iran.
Material and methods:
Daily rainfall data from Baghmalek and Ahvaz were analyzed to determine the best-fit statistical distributions, develop DDF curves using four empirical methods, and assess performance using RMSE and Nash–Sutcliffe Efficiency, along with a sensitivity analysis of the IMD parameter n.
Results and conclusions:
Results showed that the default IMD value (n = 0.333) was inaccurate for short durations, while calibrated values (n = 0.39 and 0.28) significantly improved agreement with observations and produced reliable runoff estimates.
| ISSN: | 1644-0765 |
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