Quantitative assessment of water resources by the method of the hydrological balance in the Kadey catchment area (East-Cameroon)

The hydrodynamic study was carried out using an approach that takes into account the hydrological balance, the relationships between the hydrodynamic parameters (Q, Pt, Ns, EA, Qs and T) and the influence of these parameters on the drilling productivity. The Kadey department receives on average 1428,93 mm of rain per year and the amount of water likely to infiltrate to recharge the aquifers is 107,4 mm or 7,51% of rainfall. The study of the physical and hydrodynamic parameters shows that the depths of the studied drillings vary from 45 to 90 m with an average of 69 m; the thickness of the alterites is between 2,7 and 31 m with an average of 11.9 m. The hydraulically active depths are between 60 and 80 m. The transmissivity values obtained by the method of Cooper-Jacob in descent are between 2,58.10(-3) and 4,78.10(-3) m(2)/s with an average of 1,35.10(-3) m(2)/s. Drilling flows range between 0,2 and 10 m(3)/h with an average of 2,45 m(3)/h which gives us specific flow rates between 5,4.10(-6) to 5,63.10(-4) m(3)/s for an average of 5,19.10(-4) m(2)/s. Transmissivities, specific flows and exploitation rates have coefficients of variation greater than 100%, thus reflecting the structural heterogeneity of the aquifer.