n geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land. Geomorphologists and hydrologists often view streams as being part of drainage basins. A drainage basin is the topographic region from which a stream receives runoff, throughflow, and groundwater flow. The number, size, and shape of the drainage basins found in an area vary and the larger the topographic map, the more information on the drainage basin is available.[1

An area drained by a single river is called its drainage basin or catchment area. It includes the various streams, tributaries and sub tributaries that join to create a network of the river.

There are mainly 10different types of DrainagePattern:

Trellised Drainage Pattern, Dendritic Drainage Pattern, Rectangular Drainage Pattern, Radial Drainage Pattern, Centripetal Drainage Pattern, Annular Drainage Pattern, Barbed Drainage Pattern, Pinnate Drainage Pattern, Herringbone Drainage Pattern, Parallel Drainage Pattern.