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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and PerspectivesUGANDA Lake VictoriaKENYARWANDAStudy AreaMara0 150 300504000513000522000531000Indian OceanBURUNDIZAIRELakeTanganyikaMwanzaShinyangaKigomaTaboraRukwaZAMBIAMbeyaMALAWILakeNyasaArushaDodomaSingidaIringaTangaMorogoroKilometersKilimanjaroLindiPwaniMtwaraZanzibarDar-es-SalaamIndian OceanMOZAMBIQUE7 0 7KilometersCLAY-BOUND SANDSPUGU SANDSTONESCOASTAL PLAINFig. 1 Geographical and geological situation of the study areaCLAY-BOUND SANDS9252000924300092340003. METHODSA total of 300 boreholes were visited since 2004 to 2011 and electrical conductivity (EC) was recorded forproduction of EC map (Figure 2). Fifty groundwater samples were analysed for major cations and anions.The analytical methods for the above-mentioned major ions are provided in the Laboratory Manual and inStandard Methods for Examination of Water and Wastewater (APHA, 1985). The extent of marinecontamination in the aquifer (freshwater/saltwater interface depth) is determined through resistivity loggingconducted between December 2011 and January 2012.4. RESULTS AND DISCUSSIONFigure 2(a) shows the spatial distribution of salinity in Dar-es-Salaam aquifer, which is contributed bydifferent sources of salinity (ref. Figure 3). The electric conductivity log for a Gymkhana borehole as shownin Figure 2(b) demonstrates that the EC increases with depth; and it is highly saline in the depth of morethan 18 m with EC >10000 µS/cm.265