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dc.contributor.authorAli, Zuleikha
dc.contributor.authorRwiza, Mwemezi
dc.date.accessioned2020-11-04T09:44:46Z
dc.date.available2020-11-04T09:44:46Z
dc.date.issued2020-10-23
dc.identifier.urihttps://doi.org/10.1007/s12665-020-09240-8
dc.identifier.urihttps://dspace.nm-aist.ac.tz/handle/20.500.12479/997
dc.descriptionThis research article published by Springer Nature Switzerland AG., 2020en_US
dc.description.abstractIn the present study, a 42-year record of rainfall and temperature from Airport and a 43-year rainfall record from Kizimbani meteorological station were analyzed to understand how these climatic variables are affecting groundwater supply on the Island of Zanzibar, Tanzania. Water table fluctuation (WTF) and rainfall data were examined for estimating groundwater recharge. The abstraction volume and recharge rate were used to estimate the water balance. Also, the different physicochemical parameters, such as chlorinity, nitrate, electrical conductivity (EC) and total dissolved solids (TDS) were examined to assess the impact of groundwater pumpage on water quality on the island of Zanzibar. Through the use of WTF method, the present study estimated the recharge rates, local sustainable yield (SY) and integrated water balance (IWB). Rainfall records showed that Zanzibar Island receives a total mean annual rainfall of 1673 mm out of which 7% (equivalent to 1.79 × 106 m3/y) recharges the groundwater. Temperature variations indicated an incremental trend accompanied by low rainfall. The average estimated SY was 0.72%, while the IWB showed a deficit of 39%. Furthermore, the total groundwater abstraction rate in the studied area was 2.49 × 106 m3/y, which was higher than the rate of recharge. This means that the groundwater resources are currently over-exploited and, if immediate action is not taken, the groundwater aquifers may be subjected to pollution, collapse and seawater intrusion. The effects of over-pumping were manifested by high levels of EC, chloride, TDS, total hardness and nitrate that showed an increasing trend with time.en_US
dc.language.isoenen_US
dc.publisherSpringer Nature Switzerland AG.en_US
dc.subjectClimate variabilityen_US
dc.subjectGroundwater pumpageen_US
dc.subjectWater supply sustainabilityen_US
dc.subjectWater table fluctuationen_US
dc.titleAssessment of the impact of groundwater pumpage on water supply sustainability in Zanzibar, Tanzaniaen_US
dc.typeArticleen_US


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