Proceedings of IAHS
Proceedings of IAHS
PIAHS
Articles | Volume 384
Articles | Volume 384
https://doi.org/10.5194/piahs-384-187-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/piahs-384-187-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 384
Pre-conference publication
 | 
16 Nov 2021
Pre-conference publication |  | 16 Nov 2021

Heavy rainfall frequency analysis in the Benin section of the Niger and Volta Rivers basins: is the Gumbel's distribution a one-size-fits-all model?

Djigbo Félicien Badou, Audrey Adango, Jean Hounkpè, Aymar Bossa, Yacouba Yira, Eliezer Iboukoun Biao, Julien Adounkpè, Eric Alamou, Luc Ollivier C. Sintondji, and Abel Akambi Afouda

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Short summary
Knowledge of rainfall statistical behaviour is a prerequisite to designing rainwater drainage facilities. In West Africa, most practitioners use the Gumbel distribution regardless of rainfall statistical behaviour. This study quantifies biases induced by the use of the Gumbel distribution. It was found that the use of the Gumbel distribution instead of appropriate distributions leads to an underestimation (−45.9 %) of annual daily rainfall maxima and thus to an uncertain design of facilities.
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