Hydrogeological Consultancy - Kisarawe and Kilosa Districts
The Ministry of Water TZ commissioned this study to assess groundwater availability and identify suitable borehole drilling sites in the Districts of kilosa and kisarawe. The study was a desktop study of existing geological, hydrogeological and hydrological data and reports that cover both biophysical and socio-economic aspects of groundwater. The occurrence of groundwater is largely influenced by the complex geological conditions.
Hydro geologically about 75% of Tanzania (Kongola et al., 1999) is underlain by crystalline basement complex rocks of variable composition and ages, but predominantly Precambrian, which form the basement aquifers (for example the Pangani and Makutopora basins).
Other aquifer types include karroo (found in Tanga), coastal sedimentary formation of limestone and sandstone (e.g. Dar es Salaam), and the alluvial sedimentary sequence, which mostly include clay, silt, sand and gravel, and volcanic materials (e.g. Kahe - Pangani basin).
The groundwater potential of each main aquifer type differs much from place to place or basin-wise due to variability in aquifer formations and recharge mechanisms.
Nevertheless, the hydrogeology of Tanzania was thoroughly studied and owing to that, Groundwater and G.I.S. Consultants Limited sing their unique methodology and approach identified 55 drilling sites with a success rate of over 90%.
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