Drainage geomorpho-dynamics of Rutland, South Andaman, India: a geospatial perspective

Surface runoff and soil erosion are an inevitable geomorphic phenomenon. The present study aims at the qualitative assessment of the erosive and hydrologic status of twenty watersheds of Rutland, South Andaman, India, in reciprocation to topography using drainage morphometric studies. Drainage morphometric parameters viz., basic, derived, and shape reveal the runoff and erosive status of all the twenty watersheds. The results of the present study suggest the watersheds like Bamboo Nallah 1, Mitta Nallah, Baludera, Macpherson, Dhani Nallah 2, Photo Nallah, Mayo 1, and Mayo 3 show increased surface runoff and low infiltration rate. Further, the results indicate that the aforementioned watersheds are the perennial freshwater source. Developing these watersheds through the establishment of conservatory structures at suitable sites would help to meet the freshwater demands and sustainability of South Andaman.