Small reservoirs: hot spot of scattered resources in the Volta basin

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International Water Management Institute (IWMI)

Presented by Philippe Cecchi (G-eau / IRD) at the International Forum on Water and Food (IFWF), South Africa, 14-17 November 2011. The International Forum on Water and Food (IFWF) is the premier gathering of water and food scientists working on improving water management for agricultural production in developing countries.

Formation Technologie Voyages

Small reservoirs: hot spot of scattered resources in the Volta basin P. CECCHI On behalf of the V3 Project

Burkina Faso Localization Enclosed within the large ring of the Niger River 274 200 Km 2 ( ≈ ½ France; ≈ 22% South Africa) 10,5 M. inhbts in 1996 (14,1 M. in 2006) ≈ 38 inhbts / km 2 ; recurrent poverty Upper Basins of the Volta River (Ghana)

1951-1980 1981-2000 600 mm 900 mm 1/ Threshold ≈ mid-seventies 2/ Precipitations: - 30 % 3/ Southern migration: > 100 km SR: an answer to aridification 1951-1980 > 1700 reservoirs

SR ≈ 7 M. rural folk Dry season: > 1000 km 2 > 4000 km

CPWF2: V3 Uses require water ( quantity and quality ) Uses impact the resource ( quantity and quality ) There exist trade-off between impacts and requirements That determine the nature of available resources ,[object Object],[object Object],[object Object],[object Object],Water Uses and Users Requirements Resources Impacts

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Up- & Down- scaling in terms of resource management and/but also in terms of processes involved From scale to scale CPWF2: V3

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