Beyond dams: assessing integrated water storage in the Shashe Catchment, Limpopo River Basin

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cg.contributor.affiliationInternational Water Management Instituteen
cg.contributor.affiliationZimbabwe National Water Authorityen
cg.contributor.affiliationUniversity of Botswanaen
cg.contributor.donorCGIAR Trust Funden
cg.contributor.initiativeNEXUS Gains
cg.coverage.countryBotswana
cg.coverage.countryZimbabwe
cg.coverage.iso3166-alpha2BW
cg.coverage.iso3166-alpha2ZW
cg.coverage.regionSouthern Africa
cg.coverage.regionEastern Africa
cg.coverage.subregionLimpopo River Basin
cg.coverage.subregionShashe Catchment
cg.creator.identifierGirma Yimer Ebrhaim: 0000-0002-4695-1034
cg.creator.identifierJonathan Lautze: 0000-0003-4215-5919
cg.creator.identifierMatthew McCartney: 0000-0001-6342-2815
cg.creator.identifierkarthikeyan matheswaran: 0000-0001-7377-0629
cg.identifier.doihttps://doi.org/10.1016/j.ejrh.2024.101913en
cg.identifier.iwmilibraryH053004
cg.isijournalISI Journalen
cg.issn2214-5818en
cg.journalJournal of Hydrology: Regional Studiesen
cg.reviewStatusPeer Reviewen
cg.river.basinLIMPOPOen
cg.volume55en
dc.contributor.authorEbrahim, Girma Y.en
dc.contributor.authorLautze, Jonathan F.en
dc.contributor.authorMcCartney, Matthewen
dc.contributor.authorMatheswaran, Karthikeyanen
dc.contributor.authorNyikadzino, B.en
dc.contributor.authorTafesse, N. T.en
dc.date.accessioned2024-08-27T13:36:32Zen
dc.date.available2024-08-27T13:36:32Zen
dc.identifier.urihttps://hdl.handle.net/10568/151875
dc.titleBeyond dams: assessing integrated water storage in the Shashe Catchment, Limpopo River Basinen
dcterms.abstractStudy region: The Shashe catchment, Limpopo River Basin, Botswana, and Zimbabwe. Study focus: The Shashe catchment is the third largest flow contributor to the Limpopo River Basin. Water availability in the Shashe catchment is highly seasonal due to high seasonal rainfall variability. The seasonality and inter-annual variability cause shortfalls (demand exceeds the average water availability) in certain months and years. Storage is needed to bridge the seasonal water availability “gap” and mitigate the deficits in drought years, i.e., inter-annual variability. While the need for water storage through grey infrastructure such as dams has long been known, there is growing recognition of the need for approaches to water storage that capitalize on all storage types. However, the current capacity to plan in ways that utilize all storage types is limited. The analyses conducted for this paper assessed the volume and spatial and temporal variability of different storage options – large and small dams, sand dams, soil moisture, and aquifers – in the Shashe catchment of the Limpopo River Basin. An integrated SWAT-MODFLOW model and remote sensing approach were developed for 2015–2020. New hydrological insights for the region: The total annual water storage in the Shashe catchment is approximately 44,000 Mm3 , dominated by groundwater. The annual storage is about 42,000 Mm3 in aquifers, 1500 Mm3 in soil, 700 Mm3 in large dam reservoirs, 45 Mm3 in small dams/ponds, and 0.13 Mm3 in sand dams. There is high seasonality in water storage availability. Soil moisture storage is at its maximum from January to March and lowest from July to September. Dam storage is at its maximum from March to May, and the water storage is relatively stable throughout the year. Aquifer storage is relatively stable during the dry seasons compared to other storage options. Optimizing water use considering the seasonal variation in different storage types could improve water availability and climate resilience.en
dcterms.accessRightsOpen Access
dcterms.available2024-08-07
dcterms.bibliographicCitationEbrahim, Girma Y.; Lautze, Jonathan F.; McCartney, Matthew; Matheswaran, Karthikeyan; Nyikadzino, B.; Tafesse, N. T. 2024. Beyond dams: assessing integrated water storage in the Shashe Catchment, Limpopo River Basin. Journal of Hydrology: Regional Studies, 55:101913. [doi: https://doi.org/10.1016/j.ejrh.2024.101913]en
dcterms.extent101913.en
dcterms.issued2024-10
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherElsevieren
dcterms.subjectwater storageen
dcterms.subjectriver basinsen
dcterms.subjectdamsen
dcterms.subjectwater availabilityen
dcterms.subjectsoil water contenten
dcterms.subjectgroundwateren
dcterms.subjectaquifersen
dcterms.subjectsurface wateren
dcterms.subjectreservoirsen
dcterms.subjectrainfall patternsen
dcterms.subjecttrendsen
dcterms.subjectmodelsen
dcterms.typeJournal Article

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