Hydro Geochemical Characterization of Groundwater in Alluvial Plains of Lyari and Malir Rivers in Gulshan-e-Iqbal, Karachi
Groundwater of Lyari and Malir Rivers
Gulshan-e-Iqbal and its surrounding area is studied to reveal the influence of geological factors, anthropogenic activities and weathering of aquifer rock material. Inter ionic relationship of groundwater with rocks of Nari and Gaj formation proves its unsuitability for drinking purpose. Mainly groundwater samples values are higher than the allowable limit of WHO guide line values. The graphical inter ionic association involving Ca2+ + Mg2+ and SO 2- + HCO- evidence the presence of carbonate and silicate weathering in the region. Municipal supplied water samples parameters are in permissible limits but biologically contaminated. Water samples from treated water plant contain nutrients with in limit with no biological contamination. Inter ionic ratio of Ca/Mg and Na/Cl reflect sea water intrusion and is responsible for groundwater pollution due to intimacy of study area to Arabian sea. Groundwater of the study area contains substantial level of salinity and thereafter requires purification before using it.