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World Geography25 Essential Exam Concepts
Drainage Basins GK Facts, Drainage Networks & River Patterns Guide
In fluvial geomorphology and physical hydrology, a drainage basin (also referred to as a river basin, catchment area, or watershed in North American terminology) is an expanse of land where all surface precipitation, snowmelt, and tributary streams converge to a single outlet point, such as a river mouth, lake, or oceanic basin. The geographical boundary that separates adjacent drainage basins is known as a drainage divide, watershed, or water parting—typically a topographic ridge, mountain crest, or elevated plateau. In India, for example, the Great Water Divide of the subcontinent runs from the Western Ghats through the Satpura and Vindhya ranges to the Delhi Ridge and Siwaliks, cleanly separating drainage flowing westward into the Arabian Sea from drainage flowing eastward into the Bay of Bengal.
The spatial geometry and geometric arrangement of stream networks across a drainage basin form distinctive drainage patterns. These patterns are determined by the underlying geological structure, lithological resistance of the bedrock, regional slope gradient, and structural history of the terrain. The most common pattern is the Dendritic Pattern (from the Greek dendron, meaning tree), characterized by a branching, treelike arrangement where tributaries join larger rivers at acute angles; it develops on uniform, isotropic lithology such as flat-lying sedimentary strata or homogeneous massive crystalline rocks (exemplified by the Ganga and Indus basins). In contrast, the Trellis Pattern develops in regions of folded sedimentary rocks with alternating parallel belts of hard and soft strata, where short primary tributaries join the main consequent river at right angles; classic examples occur in the folded Appalachian Mountains and the folded strike ridges of the Singhbhum region.
Other prominent drainage patterns reflect specialized geologic controls. A Radial Drainage Pattern forms when streams radiate outward in all directions from a central elevated highland, volcanic cone, or domed structure; a classic Indian example is the Amarkantak Plateau, from which the Narmada flows westward, the Son flows northeastward, and tributaries of the Mahanadi flow southeastward. Conversely, a Centripetal Drainage Pattern occurs when streams flow inward from surrounding uplands into a central topographic depression, sink, or endorheic lake, as observed in Rajasthan Sambhar Salt Lake and the Aral Sea basin. A Rectangular Drainage Pattern develops along strongly jointed or faulted bedrock where streams follow right-angled intersecting joint systems. In glaciated landscapes with poorly integrated drainage, a Deranged Pattern forms, characterized by scattered lakes, swamps, and meandering streams. Quantitative hydrologists analyze these network architectures using the Horton-Strahler Stream Order, classifying rivers from headwater first-order rills to massive master rivers.
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