The North-Eastern terrain of the Indian sub-continent receives a heavy amount of rainfall, and thus is prone to slope instability and associated landslides, causing fatalities, structural damage, and transportation disruptions, especially during the rainy season. Bio-engineering techniques are increasingly being adopted for slope stabilization in various countries worldwide. Vetiver grass (Chrysopogon zizanioides) can help to reduce soil erosion and strengthen the soil. In the present study, transient seepage analysis with and without root reinforcement for various rainfall patterns in the typical northeastern climate was done using finite element-based software SEEP/W. Corresponding stability analysis was performed using limit equilibrium-based software SLOPE/W of GeoStudio (2018). The analysis was done for a typical northeastern slope of Assam considering vegetation grown on crucial parts of the slope. The decrease in apparent cohesion, identified as root cohesion cr, with soil depth in the case of the root reinforced soil slope has been accounted for in the study, and compared with the results assuming the variation of cohesion with depth to be constant. Additionally, the influence of slope geometry (variable slope inclination) and position of the vetiver reinforcement within the slope are monitored in the study. The results demonstrated that the root reinforcement is effective in counteracting shallow sloughing slope failures, and that the placement of the vetiver roots are more beneficial when it is distributed at the top surface and the face of the slope.