although not with large volumes of water. The hydrogeology of the area can be discussed under two subdivisions: surface water and groundwater.
5.2.1 SURFACE WATER Surface water in the area is in form of streams and rivers that flow from North South down in a dendritic manner. It is seasonal and perennial. At the time of geological mapping most of the stream and rivers are dry which confirmed them to be ephemeral. Some amount of water is retained in the shallow subsurface within the voids of alluvial sand, this also provide water for domestic use during the early part of the dry season.
5.2.2 GROUNDWATER This is water tapped mostly in well and also tapped in few hand pump boreholes in the study area. There are two major types of aquifer. These aquifers are generally underground layer of porous rock or sand that allows the movement of water between layers of non-porous rocks, gravels or fractured rocks which is contained only in the shallower subsurface; the fracture crystalline aquifer and soft overburden aquifer. The soft overburden aquifer overlies the fractured overburden aquifer. Groundwater is found in the pores of the soft overburden aquifer. In the fractured crystalline aquifer, groundwater is found in the fractures. Recharge of these aquifers is mainly by rainfall directly into the soft overburden and by diffusion into the fractured crystalline aquifer. Some of the water from the rain percolates into the deep subsurface under the influence of gravity. Some of these accumulate at the water table while some are retained within the voids of sediments in the aeration zone. The ground water inventory (Table 5) shows the aeration zones (depth to water level from surface), well elevations in meters, elevation of water in wells and their location as observed in the mapped area. Table 10 shows the well inventory and the groundwater levels in the study area. 35 Â Â