• Govind Ballabh Pant Sagar is the largest man-made reservoir situated in southern part of Sonbhadra district of Uttar Pradesh.
  
• It is on the river Rihand, a main tributary of the Ganges. The river is around 784 kilometer long.

The Mangalam irrigation scheme is a medium irrigation project in Kerala. The catchment area of the project is 48.85 sq.km. It has two main canals - Left Bank Canal (LBC) of length 24.00 km and Right Bank Canal (RBC) of 21.50 km. The proposed ayacut of the project is 3.440 Th ha. The project commenced in 1953 and completed in the 1962.

• An area drained by a river and its tributaries is known as a drainage basin. 
  
• Radial drainage patterns form when rivers originate from a hill and flow in all directions. For example, the rivers originating from the Amarkantak.

• The Koshi was also called Kausika in Rigveda, Nepal and Bihar in northern India. It is a major tributary of the Ganges. One major tributary of the Koshi is the Arun, much of whose course is in Tibet. This river is mentioned in the epic 'Mahabharata' as Kausiki.
  

River regulation includes construction of irrigation canals, ditches, drainage tunnels and damns. Though they have an immense utilization for the well-being of people, it has its own defects as it affects the natural flow of water. There will be changes in physical and chemical conditions, resulting in changes in animal and plant life of the river.

• The Chambal River is a tributary of the Yamuna River in central India. The Badland topography is a characteristic feature of the Chambal valley.
  
• The Chambal's lower course is lined by a 10-mile (16-km) belt of badland gullies resulting from accelerated soil erosion and is the site of a major project in soil conservation.