Abstract
Mombasa and other coastal towns of Kenya are supplied water from inland surface water sources. Coral limestone and sand/sandstone aquifers which run parallel to the coastline have been developed for rural water supply in the South Coast. Over 80 shallow boreholes fitted with handpumps have been completed and are in use. The fresh water resources in the aquifers were assessed through an airbone INPUT EM survey with surface electrical resistivity surveys used for ground follow-up. Correlation of water quality from the boreholes with aquifer resistivity showed fresh water in aquifers with resistivity as low as 10 ohm.m. These low aquifer resistivities are attributed to the clayey nature of the aquifers. A fresh water/saline water interface could be identified from existing data only in the Diani beach area.
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