Failure of inland valleys development: A hydrological diagnosis of the Bankandi valley in Burkina Faso
Several developed inland valleys for rice production were abandoned due to poor design or implementation. The Bankandi inland valley (BIV) is a contour bunds system developed in 2006 by a development project, currently experiencing a systematic waterlogging. This study assessed: (1) the waterlogging vs. changing hydro-climatic conditions relationship; (2) the hydrological design and implementation of water control infrastructures; and (3) how digital elevation models (DEMs) data could be used for inland valleys development. To investigate the waterlogging vs. changing hydro-climatic conditions (precipitation and discharge), the conceptual HBV model was applied; coupled with break and trend detections tests. To evaluate the accuracy of the location of drainage flume and contour bunds, a topographic survey using a D-GPS was performed. To explore free DEMs as support tool in the development of inland valley, the Shuttle Radar Topography Mission 1 and the Advanced Spaceborne Thermal Emission and Reflection Radiometer 1, were used. The results show that: (1) the waterlogging was not related to changing environmental conditions; (2) major flaws including bunds not implemented on contour lines contribute to the waterlogging; (3) free DEMs were not accurate enough for valley development. The overall diagnostic of BIV entails conducting basic hydrological investigations prior to implementation.
| Main Authors: | , , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | P10 - Ressources en eau et leur gestion, P11 - Drainage, hydrologie, Engorgement du sol, bilan hydrique, ouvrage hydraulique, vallée, gestion des eaux, télédétection, http://aims.fao.org/aos/agrovoc/c_3731, http://aims.fao.org/aos/agrovoc/c_8333, http://aims.fao.org/aos/agrovoc/c_8311, http://aims.fao.org/aos/agrovoc/c_3714, http://aims.fao.org/aos/agrovoc/c_8149, http://aims.fao.org/aos/agrovoc/c_8320, http://aims.fao.org/aos/agrovoc/c_6498, http://aims.fao.org/aos/agrovoc/c_8081, |
| Online Access: | http://agritrop.cirad.fr/599054/ http://agritrop.cirad.fr/599054/1/599054.pdf |
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