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Failure of inland valleys development : a hydrological diagnosis of the Bankandi valley in Burkina Faso

Résumé : 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 sys-tematic 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 per-formed. 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.
Mots-clés : BURKINA FASO
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https://hal.archives-ouvertes.fr/hal-02362725
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Submitted on : Thursday, November 14, 2019 - 9:03:48 AM
Last modification on : Thursday, October 15, 2020 - 4:22:02 PM

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Y. Yira, Y. A. Bossa, A. Keita, J.L. Fusillier, Georges Serpantié, et al.. Failure of inland valleys development : a hydrological diagnosis of the Bankandi valley in Burkina Faso. Modeling Earth Systems and Environment, 2019, 5 (4), p. 1733-1741. ⟨10.1007/s40808-019-00628-5⟩. ⟨hal-02362725⟩

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