Water yield estimation and sedimentation control in two Volta sub-basins: tools towards integrated water resources management

Kizito Fred, Obuobie Emmanuel, Le Page Christophe, Ba Alassane, Venot Jean-Philippe. 2011. Water yield estimation and sedimentation control in two Volta sub-basins: tools towards integrated water resources management. In : 3rd International Forum on Water and Food (IFWF3), Tshwane, South Africa, November 14-17, 2011. CGIAR-CPWF. s.l. : s.n., Résumé, 2 p. International Forum on Water and Food. 3, Tshwane, Afrique du Sud, 14 Novembre 2011/17 Novembre 2011.

Résumé : Small reservoirs form a major source of water supply in the Volta basin. However, sedimentation of reservoirs poses serious threats to overall water yield and storage, consequently impacting community water supplies and livelihoods. This study will assess basin-level water yields and sediment inflow deposited in reservoirs in two Volta sub-basins using the WEAP and SWAT models in combination with spatial analysis techniques. The WEAP Model will assess water allocations while the SWAT model will compute water balance, runoff and sediment yields. Ancillary measured sediment yield data will be used in combination with terrain-based distributed models in a GIS to identify and predict major areas of erosion in the two study sites. Social and biophysical dynamics will be concomittantly assessed through a multi-agent modeling framework (ComMod). To this end, the WEAP and SWAT models will be linked to the computer simulation tool of the ComMod platform. This will allow for assessing the consequences of local practices -and possibly proposed intervention- in terms of erosion (see figure). The results and the approach can be used as decision-support tools to identify practical IWRM interventions that reduce erosion e.g. vegetation strip-ways. It is anticipated that this will result in improved water resources management and reduce impacts of drought spell shocks on the affected communities and could be replicated elsewhere in the Volta basin. (Texte intégral)

Classification Agris : P10 - Ressources en eau et leur gestion
U10 - Informatique, mathématiques et statistiques

Auteurs et affiliations

• Kizito Fred, IWMI (GHA)
• Obuobie Emmanuel, WRI Ghana (GHA)
• Le Page Christophe, CIRAD-ES-UPR GREEN (FRA) ORCID: 0000-0002-1920-0091
• Ba Alassane, Université de Dakar (SEN)
• Venot Jean-Philippe, IWMI (BFA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/562242/)

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