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• W2113776141 abstract "The study site lies in a semi arid climatic zone in the south eastern part of Zimbabwe. Theoverall climate, with a mean annual rainfall of 350 mm/annum is not generally suitable forfarming, but groundwater from alluvial aquifers is a possible resource for supplementaryirrigation. The main source of water for most purposes is surface water, but its scarcitycauses problems for general livelihoods. The Mzingwane river is ephemeral and thus onlyflows for a limited period of time during the year. The local community as such has to relyon groundwater from alluvial aquifers for domestic purposes and food production. Alluvialaquifers have the advantage that when they are deeper than 1m, less water is lost toevaporation. However, the main challenge with such aquifers is that abstraction for largescale use is expensive and usually requires investment in motorized pumps which can beexpensive for the local communitiesThis study evaluated groundwater resources at a local scale by characterizing the Malalaalluvial aquifer, which covers a stretch of 1000 m of the Mzingwane river and is on average200 m wide. The aquifer is recharged, naturally, by flood events during the rainy season and,artificially, by managed dam releases from Zhovhe dam during the dry season. The Malalasite was selected from geological mapping and resistivity studies.The site shows indications of deeper sand layers and hence would be expected to have ahigher potential of storing more groundwater. Piezometers were installed in the river channelto monitor the water level fluctuations in the alluvial aquifer. Water samples were collectedfrom Zhovhe dam, Mazunga area and Malala alluvial aquifer in order to analyse the majorion chemistry of the water at the aquifer and at the source of recharge. A piper diagramanalysis showed that the water in the alluvial aquifer can be classified as sodium sulphate.The water is also of a low sodium hazard and can therefore be used for irrigation withoutposing much risk to the compaction of soils.Laboratory tests were carried out to characterize the Malala alluvial aquifer material for theporosity, hydraulic conductivity and specific yield of the aquifer. The porosity of the alluvialaquifer was calculated to be 39% with a hydraulic conductivity of 59.76 md-1 and a specificyield value of 5.4 %. The slope of the alluvial aquifer was measured as 0.38 %.Resistivity surveys showed that the alluvial aquifer has an average depth of 13.4 m. Thealluvial aquifer is more enhanced on the upstream part of the dolerite dyke. The bedrock ismetamorphic rock mainly tonalitic and granodioritic gneisses. A sieve analysis experimentshowed that the alluvial aquifer is sand. Water level observations from the installedpiezometers indicated that the water levels dropped on average by 0.75 m within 97 daysafter the observed dam release.The alluvial aquifer system can store approximately 1 035 000 m3 of water per km length ofthe river. 116 000 m3 of this water is readily available for abstraction and has a potential ofirrigating at least 11.6 ha/annum. An increase in the number of timed releases can lead to anincrease in the groundwater potential. 46.4 ha of land can be irrigated from the alluvialaquifer from at least four releases per annum which saturate the aquifer. The alluvial aquifercan thus store a significant amount of water and has a high groundwater potential to sustainboth domestic and irrigation water supply through out the year.,WATERnet" @default.
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• W2113776141 date "2012-10-18" @default.
• W2113776141 modified "2023-09-26" @default.
• W2113776141 title "EVALUATION OF THE GROUNDWATER POTENTIAL OF THE MALALA ALLUVIAL AQUIFER, LOWER MZINGWANE RIVER, ZIMBABWE" @default.
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