Hydraulic parameters in the Neoproterozoic aquifer of Yaounde, Cameroon

In this paper, hydrological properties generally needed to improve all over the world the policy and then the sustainability of groundwater resources are also presented in the Neoproterozoic terrane of Yaoundé Cameroon. For this purpose, data collected from 150 boreholes realized in the study area were analysed statistically. The transmissivity (T) and the specific flow (Q/S) have been deduced from the pumping tests interpretation using the Jacob recovery method. The average transmissivity is equal to 2.9 × 10⁻⁵ m²/s, and the specific flow is equal to 0.26 m²/s. Wells depth (D) in general ranges from 41 to 80 m with an average of 57 m. The empirical relationship between T and Q/S is T = 0.0158(Q/S)^1.01 with the determination coefficient R² = 0.64. The weathered layer has a thickness (H) ranged from 2.6 to 63.3 m with an average of 16.8 m. Compared to other areas of the crystalline basement, although in the middle of the equatorial forest, the mean specific flow and the mean transmissivity in the Neoproterozoic terrane of Yaoundé represent barely half values. Those parameters are of paramount importance in the groundwater management policy.