Micro-basins are slope management structures built of earth and stones on hillslopes around cultivated trees (e.g., olive trees) for the harvesting of rainfall and runoff water, and for the rehabilitation of land degraded by water erosion. In this study, the results of an experimental survey for the comparison of soil water content for both inside and outside the micro-basins are analysed. Measurements are taken after some rainfall events from January to December 2003 in a hilly region of Central Tunisia. The time domain reflectometry technique is used to measure soil moisture in 15 sets of soil profiles (inside and outside) at three different depths. The data analysis shows a significant improvement on the water stock obtained by this type of management.