IAHS2022-19, updated on 22 Sep 2022
https://doi.org/10.5194/iahs2022-19
IAHS-AISH Scientific Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Low flows and irrigation in Mono River basin at Athiéme outlet (West -Africa).

Coffi Justin Noumon1, Domiho Japhet Kodja2, Ernest Amoussou2, Luc Olliver Sintondji1, and Euloge Kossi Agbossou1
Coffi Justin Noumon et al.
  • 1Université d'Abomey-Calavi, Institut National de l'Eau, Laboratoire d'Hydraulique et de Maîtrise de l'Eau (LHME), Benin (justinoum2001@yahoo.fr)
  • 2Université d'Abomey-Calavi, Institut de Géographie et Aménagement du Territoire et de l'Environnement (IGATE),Laboratoire Pierre Pagney Climat Eau Ecosystèmes et Développement (LACEEDE),

Low flows and irrigation in Mono River basin at Athiéme outlet (West -Africa)

1Coffi Justin Noumon, 2Domiho Japhet Kodja, 2Ernest Amoussou, 1Luc O. Sintondji,1 Euloge K. Agbossou.

1Laboratoire d’Hydraulique et de Maîtrise de l’Eau (LHME), Institut National de l’Eau, Université d’Abomey Calavi 01 BP 526 Cotonou (Bénin).

2Laboratoire Pierre Pagney Climat Eau Ecosystèmes et Développement (LACEEDE), Institut de Géographie et Aménagement du Territoire et de l’Environnement, Université d’Abomey Calavi 01 BP 526 Cotonou (Bénin).

Auteur correspondant: 1Coffi Justin NOUMON (justinoum2001@yahoo.fr)

Abstract

The basic goal of this survey is the assessment of water resources of Mono River at Athiémé outlet in low flow period where it availability for agriculture uses is problematic. Therefore, daily data (precipitations, ETP, flows) from 1971 to 2016 are collected. It allows to simulate low discharge with GR4J model. Field survey permits the characterization of agriculture uses and the assessment of water requirement for irrigation. Low flows of Mono River at Athiémé outlet simulation with GR4J showed a good performance of the model to simulate low discharges before the construction of Nangbéto dam in 1988. Criteria values of Nash-Sutcliffe before dam establishment are 69% (calibration) and 71% (validation). The performance of the model is less for the period after the dam establishment: The change in the hydrological regime of the river due to water jets from Nangbéto dam can explain this low performance. Water requirement for irrigated areas estimation has given 42 587 596 m3 in 2020 and 73 007 308 m3 in 2030 mainly for the constraint period production which came from february to may. The comparison of water availability/water requirement shows that the water needs are closely covered monthly but a fine decade period analysis revealed some deficit decades. These results involve a great attention and consequent investments for deep knowledge of the resource in order to plan it sustainable management.

Key words: Mono basin, Low flow, GR4J, Irrigation.

How to cite: Noumon, C. J., Kodja, D. J., Amoussou, E., Sintondji, L. O., and Agbossou, E. K.: Low flows and irrigation in Mono River basin at Athiéme outlet (West -Africa)., IAHS-AISH Scientific Assembly 2022, Montpellier, France, 29 May–3 Jun 2022, IAHS2022-19, https://doi.org/10.5194/iahs2022-19, 2022.