Home Preparation for National Talent Search Examination (NTSE)/ Olympiad
Chapter : 3. Drainage
Glossary
1. Perennial Rivers : These are the rivers which flow through out the year as they get water from the rainfall as well as melting of ice. 2. Lagoon : A part of the sea near the land which has been cut off from the open sea at low tide. 3. River basin : The area drained by a single river system is called a river basin. 4. Drainage : A system of flowing water from the higher level to the lower level. 5. Water shed : The upland or a mountain which separates two adjoining drainage basin is known as water shed or water divide. 6. Gorge : A deep narrow opening formed by the river in the upper course. 7. Lake : A body of water lying on a hollow on the earth’s surface and being entirely surrounded by land is known as a lake. 8. Inland drainage : A drainage system in which rivers do not reach on ocean but empty their water into a lake is called inland drainage. 9. Tributary : A tributary is that river which joins the main river and increases the volume of water. 10. Distributary : A distributary is that river which originates from a main river. It is formed near the mouth of river before it falls into the sea. It is found in the lower course of the river.