Multitracer approach towards an improved understanding of shallow hard rock aquifers and a more sustainable groundwater management, case of Yaounde, Cameroon

Review of Isotope Hydrology Investigations on Aquifers of Cameroon (Central Africa): What Information for the Sustainable Management of Groundwater Resources?

“…The aquifers are drained by rivers and springs at low elevation, which is typical in hard rock areas where groundwater watersheds are similar to surface watersheds [20]. The groundwater flow directions are in conformity with the major lineaments of hydrogeological importance [21].…”

“…This can be supported by the fact during the dry season (November to February), the soil is dry and the precipitation occurring at this time only moistens the soil and sustains the vegetation. On the other hand, during the peak (July-August) of the rainy season, the soil is saturated with water and the frequency of floods increase; therefore, there is no recharge [21].…”

“…(ii) cluster of samples close to the weighted mean precipitation and well on the LMWL, refers to an autochthonous recharge of the aquifer, also defined as diffuse recharge, i.e., direct infiltration of rain followed by percolation to the water table [44]. (iii) For the third group, samples below the weighted mean rainfall and above the LMWL, the depleted signature here may be related to a MSR as this region is characterized by local hills, valleys and plateaus [21].…”