Sediment load mitigation strategies for the Karanja Reservoir, Karnataka

¹ Department of Civil Engineering, Mangalore Institute of Technology & Engineering, Badaga Mijar, Moodabidri, India
² Department of Civil Engineering, Universitas Andalas, Padang, West Sumatera, Indonesia

^* Corresponding author: rina@eng.unand.ac.id

Abstract

The progressive deposition of sediment transported by inflowing rivers is a critical consideration for dam engineers, as it directly influences active storage capacity, outlet sill elevation, structural stability, and upstream backwater effects. Predicting the vertical and spatial distribution of sediments is essential for informed design and operational decisions. Globally, reservoirs lose 0.5–1.0% of their storage capacity annually due to sedimentation, with complete infill occurring within 50–200 years, depending on hydrological, geomorphological, and catchment characteristics. The process is primarily driven by soil erosion in upstream basins, aggravated by anthropogenic factors such as deforestation and overgrazing, often compounded by climatic variability and natural surface dynamics. This study focuses on assessing sedimentation processes and formulating management strategies for the Karanja Reservoir, Bidar, to mitigate capacity loss and sustain long-term functionality.