Land degradation and recurrent drought are the major threats to rain-fed agriculture in the semiarid Ethiopian highlands. To reduce the risk of crop failure induced by moisture stress and to bring food self sufficiency through irrigation, water harvesting has become a priority in theGebeyehu Taye, Poesen, J., Van Wesemael, B., Vanmaercke, M., Daniel Teka, Deckers, J., Goosse, T., Maetens, W., Nyssen, J., Hallet, V., Nigussie Haregeweyn, 2013. Effects of land use, slope gradient, and soil and water conservation structures on runoff and soil loss in semi-arid northern Ethiopia. Physical Geography, 34(3), 236-259.2

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The text is a facsimile of the print edition. Licence CC BYNumber 89, July 6 th 2015. ISSN 2031-0293 Like many cities, Brussels faces increasing water issues like urbanization spreading and stresses on the water resources. Integrated Water Management (IWM) in urban planning tackles these problems focusing on the landscape features, but requires extensive cartographic data. Since 2010, different platforms offer cartographic data for the Brussels and Flemish regions, but these initiatives are independent and often not coherent. This article analyses the potentials and deficiencies of these cartographic data through two transboundary examples: the catchments of the Brussels area and the Molenbeek catchment. The article highlights how non-concordance and non-accessibility of the data constrain the application of IWM and other urban planning issues in transboundary areas. Tom Goosse has a master degree in physical geography from the Vrije Universiteit Brussel (2012). His Master thesis was part of an international research program focusing on rainfall management in the Tigray province of Ethiopia. His personal interests being more oriented towards the rainfall problematic in Brussels, he is now working towards a PhD on the application of water Low Impact Development techniques in urban settings. tpegoosse@gmail.com Kevin De Bondt has a master degree in Geology from the Université Libre de Bruxelles (2005) and a specialization in Natural Hazard management from the Université de Liège. Since March 2008, he carried out many projects in the Brussels Region and abroad, on the urban water cycle, flood-mitigation in urban environments, river restoration and rainwater infiltration. He has developed the concept of Urban Hydrological Landscapes that summarizes the heterogeneity of the physical environment and make its integration in urban planning measures possible at local and regional scale. He frequently consults or advices public authorities and citizen groups on water policies. Dr. Guido Petrucci is an environmental engineer and urban hydrologist working on storm-water management in urban areas. After a joint degree in engineering (

Kevin De Bondt est titulaire d'un master en géologie de l'Université Libre de Bruxelles (2005) et d'un master complémentaire en gestion des risques naturels de l'Université de Liège. Depuis mars 2008, il a mené à bien de nombreux projets dans la Région bruxelloise et à l'étranger, relatifs au cycle hydrologique urbain, à la lutte contre les inondations dans les villes, à la restauration des cours d'eau et à l'infiltration des eaux pluviales. Il a élaboré le concept de « paysages hydrologiques urbains », qui synthétise l'hétérogénéité de l'environnement physique et permet d'en tenir compte dans le cadre de mesures d'aménagement urbain à l'échelle locale et régionale. Il consulte et conseille fréquemment les autorités publiques et associations citoyennes en matière de politiques relatives à l'eau. Ingénieur en environnement et en hydrologie urbaine, Dr. Guido Petrucci travaille sur la gestion des eaux pluviales en milieu urbain. Après avoir suivi un programme d'études conjoint en ingénierie (Politecnico di Milano et