The people living along the Lobo catchment area in Nibéhibé are experiencing difficulties in supplying drinking water due to the impacts of climate variability and the anthropic pressures on the surface water used. The objective of this study is to characterise the groundwater-river interactions based on the major fracturing and the hydrographic network. The hydrographic network and the major fracturing map were used as data for the different treatments. Also, the hierarchy of the hydrographic network using the Strahler method highlighted the rivers of order 1 to 5. Frequency curves of the number of drains and cumulative lengths according to Strahler's orders were constructed and then interpreted using the «law of rivers» to detect drains with a structural origin. The distribution of drains in the river system follows the exponential law with a good correlation coefficient (R² =0.97). Moreover, the coupling of the map of watercourses of structural origin and the map of major fractures has made it possible to highlight potential areas of groundwater-river exchange. These zones represent the intersection of permanent watercourses and areas of very high fracture density.

Rice is a strategic axis of socio-economic development of the region of Denguele because of the population increase. In spite of the essential role which plays the rice in the consumption of the population in developing countries, its production remains always insufficient. National policy of C