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dc.contributorOweis, Theiben_US
dc.contributorMasmoudi, Mohamed Moncefen_US
dc.contributorKhatteli, Houcineen_US
dc.contributorOuessar, Mohameden_US
dc.contributorSghaier, Mongien_US
dc.contributorAnane, Makramen_US
dc.contributorSghaier, Nabilen_US
dc.creatorBen Mechlia, Netijen_US
dc.identifier.citationNetij Ben Mechlia, Theib Oweis, Mohamed Moncef Masmoudi, Houcine Khatteli, Mohamed Ouessar, Mongi Sghaier, Makram Anane, Nabil Sghaier. (1/12/2009). Assessment of Supplemental Irrigation and Water Harvesting Potential: Methodologies and Case Studies from Tunisia. Aleppo, Syrian Arab Republic: International Center for Agricultural Research in the Dry Areas (ICARDA).en_US
dc.description.abstractAn innovative, low-cost methodology was developed to assess the potential of sites in Tunisia for supplemental irrigation and water harvesting. The methodology, which uses commonly available technologies and information such as remote sensing and a Digital Elevation Model (DEM), was developed and tested using newly constructed hill reservoirs (used to capture surface runoff) and traditional water harvesting systems. Supplemental irrigation potenatial was studied in a pilot area, Oued R’mel in north-eastern Tunisia, Starting with currently operational hill-reservoirs, Aster images and DEM files were used to map sites suitable for intercepting water along short-lived watercourses. Indices to describe land suitability for irrigation were derived by combining qualitative soil information with DEM data. The outscaling operation from pilot site to the entire country was carried out through several steps, taking into consideration changes in suitability attributes related to changes in rainfall. The end product was an overlay of areas suitable for constructing hillreservoirs on a map of soils receptive to irrigation, on a scale of 1/500000. Traditional water harvesting systems were studied at a pilot watershed, Oum Zessar, in the hilly arid (rainfall < 250 mm) area of southern Tunisia. The study focused on techniques used on steep slopes (Jessour) and piedmonts (Tabia). Slope and size of the watershed (separately) were the main criteria for defining land as suitable for Jessour and Tabia. Through iterative operations, we found optimums for pixels aggregation to set suitability conditions. The analysis also included geo-referenced data on local population in order to identify socioeconomic factors that could determine success. The most important factor was direct involvement of local farmers in water harvesting and use.en_US
dc.publisherInternational Center for Agricultural Research in the Dry Areas (ICARDA)en_US
dc.subjectsatellite imagesen_US
dc.subjecthill reservoirsen_US
dc.subjectdigital elevation modelen_US
dc.subjectspatial representationen_US
dc.titleAssessment of Supplemental Irrigation and Water Harvesting Potential: Methodologies and Case Studies from Tunisiaen_US
dc.typeInternal Reporten_US
cg.creator.idOweis, Theib: 0000-0002-2003-4852en_US
cg.subject.agrovocland suitabilityen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerArid Regions Institute - IRAen_US
cg.contributor.centerNational Agronomic Institute of Tunisia - INATen_US
cg.contributor.crpCGIAR Research Program on Water, Land and Ecosystems - WLEen_US
cg.contributor.funderInternational Water Management Institute, The CGIAR initiative on Comprehensive Assessment of Water Management in Agricultureen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionNorthern Africaen_US
dc.identifier.statusOpen accessen_US
icarda.series.nameWater assessmenten_US
cg.isbn92 9127 222-1en_US

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