{"id":30579,"date":"2026-10-03T17:35:39","date_gmt":"2026-10-03T12:05:39","guid":{"rendered":"https:\/\/vajiramandravi.com\/upsc-exam\/?p=30579"},"modified":"2026-10-03T17:35:39","modified_gmt":"2026-10-03T12:05:39","slug":"drainage-system-of-india","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/upsc-exam\/drainage-system-of-india\/","title":{"rendered":"Drainage System of India, Types, Classification, Major Rivers"},"content":{"rendered":"<p><span style=\"font-weight: 400\">The drainage system of India comprises an extensive network of rivers, tributaries, streams, lakes and drainage basins that shapes the country\u2019s physical and socio-economic landscape. Influenced by relief, geological structure, climate and tectonic history, the drainage system of India broadly consists of the Himalayan and Peninsular drainage systems, along with areas of inland drainage. The Himalayan rivers are generally perennial, receiving water from rainfall, snow and glacier melt, while most Peninsular rivers are predominantly rain-fed and show greater seasonal variation.<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">The drainage system of India supports agriculture, drinking water supply, hydropower, navigation, ecosystems and livelihoods. However, the drainage system of India faces challenges from pollution, floods, droughts, inter-state water disputes, climate change and altered river flows.<\/span><\/p>\r\n<h2><span style=\"font-weight: 400\">Drainage System Meaning<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">The drainage system of an area refers to the network of rivers, streams and other channels through which surface water is drained from a region into a common outlet or terminal basin. The drainage system is related to several factors, such as relief and slope, geological structure, rock type, climate and rainfall, tectonic history and river discharge\/runoff.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Catchment Area: <\/b><span style=\"font-weight: 400\">A river drains the water collected from a specific area, which is called its 'catchment<\/span><b> area'.<\/b><span style=\"font-weight: 400\">\u00a0An area drained by a river and its tributaries is called a drainage basin.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>River basin:<\/b><span style=\"font-weight: 400\"> The catchments of large rivers are called <\/span><b>river basins, <\/b><span style=\"font-weight: 400\">while those of small rivulets and rills are often referred to as <\/span><b>watersheds<\/b><span style=\"font-weight: 400\">.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">There is a slight difference between a river basin and a watershed. Watersheds are small in area, while basins cover larger areas.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Water divide: <\/b><span style=\"font-weight: 400\">It separates the flow of water into different drainage basins or watersheds. It is an elevated boundary or ridge that determines the direction in which water will flow.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Water Divide in India: <\/b><span style=\"font-weight: 400\">The major water divides of India are formed by elevated relief features such as the Himalayas, Aravalli\u2013Delhi Ridge, Vindhya\u2013Satpura ranges and <a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/western-ghats\/\" target=\"_blank\"><strong>Western Ghats<\/strong><\/a>, which separate different drainage basins and influence the direction of river flow.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<p><img decoding=\"async\" class=\"size-full wp-image-30599 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01175607\/drainage-system-6.png\" alt=\"Drainage System of India\" width=\"580\" height=\"702\" \/><\/p>\r\n<h2><span style=\"font-weight: 400\">Drainage System of India and Drainage Pattern Types<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">India showcases a wide variety of drainage patterns, which are shaped by the physical structure of the land and the type of rock formations.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">It is characterised by large rivers and their tributaries that form a well-defined pattern across the landscape.<\/span><\/li>\r\n\t<li><span style=\"font-weight: 400\">The underlying geology and topography of the area primarily influence the major drainage patterns. The major drainage patterns are:<\/span><\/li>\r\n\t<li><b>Dendritic Drainage Pattern:<\/b><span style=\"font-weight: 400\"> A tree-like branching network formed where rivers and tributaries flow over relatively uniform rock and gently sloping terrain.<\/span><\/li>\r\n<\/ul>\r\n<p><img decoding=\"async\" class=\"wp-image-30592 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174731\/Drainage-System-2.png\" alt=\"Drainage System of India\" width=\"720\" height=\"342\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174731\/Drainage-System-2.png 1820w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174731\/Drainage-System-2-768x365.png 768w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174731\/Drainage-System-2-1536x729.png 1536w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/p>\r\n<ul>\r\n\t<li><b>Radial Drainage Pattern:<\/b><span style=\"font-weight: 400\"> A pattern in which streams flow outward in different directions from a central elevated area, such as the <\/span><b>Amarkantak region<\/b><span style=\"font-weight: 400\">.<\/span><\/li>\r\n\t<li><b>Centripetal Drainage Pattern:<\/b><span style=\"font-weight: 400\"> A pattern in which streams converge towards a central depression, where seasonal water accumulation may lead to evaporation and salt deposition.<\/span><\/li>\r\n<\/ul>\r\n<p><img decoding=\"async\" class=\"wp-image-30593 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174822\/Drainage-System-3.png\" alt=\"Drainage System of India\" width=\"819\" height=\"311\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174822\/Drainage-System-3.png 2033w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174822\/Drainage-System-3-768x292.png 768w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174822\/Drainage-System-3-1536x584.png 1536w\" sizes=\"(max-width: 819px) 100vw, 819px\" \/><\/p>\r\n<ul>\r\n\t<li><b>Rectangular Drainage Pattern:<\/b><span style=\"font-weight: 400\"> A structurally controlled pattern formed in fractured or faulted rocks, with streams making sharp bends and tributaries often joining at right angles.<\/span><\/li>\r\n<\/ul>\r\n<p><img decoding=\"async\" class=\"wp-image-30594 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174942\/Drainage-System-4.png\" alt=\"Drainage System of India\" width=\"789\" height=\"408\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174942\/Drainage-System-4.png 1744w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174942\/Drainage-System-4-768x397.png 768w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01174942\/Drainage-System-4-1536x794.png 1536w\" sizes=\"(max-width: 789px) 100vw, 789px\" \/><\/p>\r\n<ul>\r\n\t<li><b>Trellis Drainage Pattern:<\/b><span style=\"font-weight: 400\"> A pattern formed in folded terrain with alternating hard and soft rocks, where the main streams follow valleys and tributaries join them nearly at right angles.<\/span><\/li>\r\n<\/ul>\r\n<p><img decoding=\"async\" class=\"wp-image-30595 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01175049\/Drainage-System-5.png\" alt=\"Drainage System of India\" width=\"384\" height=\"459\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01175049\/Drainage-System-5.png 1148w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/10\/01175049\/Drainage-System-5-768x917.png 768w\" sizes=\"(max-width: 384px) 100vw, 384px\" \/><\/p>\r\n<h2><span style=\"font-weight: 400\">Drainage Systems of India Classification<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">India's drainage system is diverse and can be classified based on factors such as water discharge, watershed size, and river characteristics. It encompasses major river basins like the Ganga and Brahmaputra, as well as the Himalayan and Peninsular drainage systems.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Based on Direction of Drainage: <\/b><span style=\"font-weight: 400\">India's rivers can broadly be grouped into those draining towards the Arabian Sea and those draining towards the Bay of Bengal.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">These two systems are separated by geographical features such as the Delhi Ridge, the Aravalli Range, and the <\/span><a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/western-ghats\/\" target=\"_blank\"><span style=\"font-weight: 400\">Western Ghats<\/span><\/a><span style=\"font-weight: 400\"> (Sahyadris).<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">There are rivers of inland drainage that terminate in lakes, depressions or disappear into the desert.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Based on Size:<\/b><span style=\"font-weight: 400\"> Rivers are classified by watershed size into three groups: major, medium, and minor basins.\u00a0<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Major basins<\/b><span style=\"font-weight: 400\">, with catchment areas over 20,000 sq. km, include rivers like the Ganga, Brahmaputra, and Krishna.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Medium basin<\/b><span style=\"font-weight: 400\">s, covering 2,000 to 20,000 sq. km, feature rivers like the Kalindi, Periyar, and Meghna.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Minor basins<\/b><span style=\"font-weight: 400\">, less than 2,000 sq. km, consist of smaller rivers in low rainfall areas.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Based on Origin:<\/b><span style=\"font-weight: 400\"> The drainage system can also be categorised by origin and characteristics into the <\/span><b>Himalayan Drainage System<\/b><span style=\"font-weight: 400\">, which includes snow-fed, perennial rivers, and the <\/span><b>Peninsular Drainage System<\/b><span style=\"font-weight: 400\">, comprising seasonal rivers largely dependent on monsoon rainfall.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Himalayan Drainage System<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">The Himalayan drainage system has changed over extensive geological development. It primarily includes the Ganga, Indus, and Brahmaputra river basins. Rivers in this system are perennial because both precipitation and snowmelt nourish them.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">These rivers flow through enormous gorges formed by erosional activity occurring simultaneously with the uplift of the Himalayas.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Along their mountainous course, these rivers create deep gorges in addition to V-shaped valleys, rapids, and waterfalls. They create depositional features like flat valleys, oxbow lakes, floodplains, braided channels, and deltas close to the river mouth as they enter the plains.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">These rivers have a very tortuous course in the Himalayan reaches, but over the plains, they exhibit a strong tendency to meander and frequently change their courses. The sediments deposited by the Himalayan river systems have contributed substantially to the formation of the vast alluvial Indo-Gangetic-Brahmaputra plains.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Peninsular Drainage System<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">The Peninsular drainage system is generally older and more mature than the Himalayan drainage, although its present configuration has also been modified by tectonic movements, faulting and changes in regional drainage.\u00a0<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The broad, largely graded shallow valleys and the maturity of the rivers demonstrate this.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Western Ghats, which run close to the western coast, serve as a water divide between the major peninsular rivers, which discharge their water into the Bay of Bengal and the Arabian Sea.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Inland Drainage<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">Inland drainage is a hydrological system where rivers and streams do not reach an ocean or sea, instead emptying into inland lakes, landlocked seas, or disappearing into desert sands via evaporation and absorption. It is also known as an endorheic or closed basin system.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Some rivers of western Rajasthan and adjoining arid regions do not reach the sea. They terminate in inland lakes such as Sambhar, disappear into the sands, or lose their flow through evaporation and infiltration.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Luni is the principal river associated with inland drainage in Rajasthan, although it ultimately reaches the Rann of Kachchh rather than the open sea.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Himalayan River System and Peninsular River System Differences<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">The Himalayan River System consists of perennial rivers fed by glaciers and rainfall, with long courses and high erosional activity. At the same time, the Peninsular River System has seasonal rivers, shorter courses, and relies mainly on monsoon rainfall.<\/span><\/p>\r\n<table style=\"width: 96.8925%\">\r\n<tbody>\r\n<tr>\r\n<td class=\"tb-color\" style=\"width: 14.4289%\"><b>Basis of Difference<\/b><\/td>\r\n<td class=\"tb-color\" style=\"width: 36.629%\"><b>Himalayan Rivers<\/b><\/td>\r\n<td class=\"tb-color\" style=\"width: 45.0344%\"><b>Peninsular Rivers<\/b><\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Origin<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Most rivers originate from glaciers, snowfields and high-altitude springs in the Himalayas.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Most rivers originate in the Western Ghats, Central Highlands and other parts of the Peninsular Plateau.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Geological age<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Rivers are generally associated with relatively young and tectonically active mountain systems.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Rivers flow across an ancient, stable geological landmass.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Nature of flow<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Most major rivers are perennial due to rainfall, snowmelt and glacial meltwater.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Many rivers depend mainly on monsoon rainfall, although some have more sustained flows.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Drainage development<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Deep valleys, gorges and structurally controlled courses are common in mountainous areas.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Drainage is influenced by plateau relief, rock structure, faults and fractures.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Drainage patterns<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Dendritic patterns occur in the plains, while structurally controlled and irregular patterns occur in mountainous regions.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Dendritic, radial, rectangular and trellis patterns occur in different geological settings.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>River length<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Major river systems generally have long courses extending from the mountains across extensive plains.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Many rivers have comparatively shorter courses, although the Godavari, Krishna and other major rivers are long.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Valley formation<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Rivers often form deep gorges and narrow valleys in mountainous regions.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Rivers generally flow through broad valleys and plateau regions, with local gorges and waterfalls.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Meandering<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Meandering is prominent in the Northern Plains, where rivers flow over relatively gentle slopes.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Meandering occurs in some stretches, particularly in lower courses and deltaic plains.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Sediment load<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Many rivers carry substantial sediment from Himalayan erosion and transport it to the plains.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Sediment load varies with catchment geology, rainfall, erosion and land use.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Direction of flow<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">The Indus system drains into the Arabian Sea, while the Ganga and Brahmaputra systems drain into the Bay of Bengal.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Most major rivers, including the Godavari, Krishna, Mahanadi and Kaveri, flow eastward; the Narmada and Tapi flow westward.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><b>Examples<\/b><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Indus, Ganga, Brahmaputra, Yamuna, Ghaghara, Gandak and Kosi.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Godavari, Krishna, Kaveri, Mahanadi, Narmada, Tapi, Pennar and Sabarmati.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 14.4289%\">\r\n<p><strong>Flood characteristics<\/strong><\/p>\r\n<\/td>\r\n<td style=\"width: 36.629%\">\r\n<p><span style=\"font-weight: 400\">Floods may result from intense monsoon rainfall, snowmelt, glacial lake outbursts and channel changes.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 45.0344%\">\r\n<p><span style=\"font-weight: 400\">Floods are commonly associated with heavy monsoon rainfall, cyclones, reservoir releases and catchment runoff.<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><span style=\"font-weight: 400\">Drainage System of India and Major Rivers<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">The drainage system of India comprises several major river systems, each playing a vital role in the country's ecology and economy. The Indus, Ganga, Brahmaputra, and Peninsular rivers significantly influence agriculture, livelihoods, and cultural practices across the nation<\/span><\/p>\r\n<h3><span style=\"font-weight: 400\">Indus River<\/span><\/h3>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Indus River System originates in Tibet and flows through India and Pakistan. It flows northwest between the Ladakh and Zaskar ranges, passing through Ladakh and Baltistan. It forms a gorge near Gilgit in Jammu and Kashmir.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">It enters Pakistan near Chilas in the Dardistan region. It is one of the longest rivers in the world. The major tributaries include the Jhelum, Chenab, Ravi, Beas, and Sutlej.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Indus plays a crucial role in supporting agriculture and livelihoods in the region.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Ganga River<\/span><\/h3>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Ganga River rises in the Gangotri glacier near Gaumukh (3,900 m) in the Uttarkashi district of Uttarakhand.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">It is known as the Bhagirathi here. The river cuts through the Central and Lesser Himalayas in narrow gorges. It passes through Uttarakhand, Uttar Pradesh, Bihar, and West Bengal. The river discharges itself into the Bay of Bengal near Sagar Island.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Yamuna River is a major tributary of the Ganga. Other tributaries include Son, Chambal, Gandak, Kosi, Ghaghara and others.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Brahmaputra River<\/span><\/h3>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Brahmaputra\u2013Yarlung Tsangpo system originates in Tibet; the Angsi (Nangser) Glacier is identified in recent studies as the source of the river's longest headstream, while the Chemayungdung Glacier has traditionally been regarded as its source.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Known as the <\/span><b>Tsangpo <\/b><span style=\"font-weight: 400\">in southern Tibet, it carves a deep gorge in the Central Himalayas before emerging as the Siang or Dihang.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Entering India near Sadiya in Arunachal Pradesh, it flows into Bangladesh, where it becomes the Jamuna after the Tista joins its right bank.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The river eventually merges with the <\/span><b>Padma<\/b><span style=\"font-weight: 400\">, flowing into the <\/span><a href=\"https:\/\/vajiramandravi.com\/current-affairs\/bay-of-bengal\/\" target=\"_blank\"><b>Bay of Bengal<\/b><\/a><span style=\"font-weight: 400\">. Major tributaries include the Dibang, Lohit, and Subansiri.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Peninsular Rivers<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">The Peninsular drainage system comprises rivers flowing across the Peninsular Plateau and adjoining highlands. Most are primarily rain-fed and show greater seasonal variation, although several major rivers have substantial basins and form extensive deltas. Major rivers of the peninsular river system include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Narmada River:<\/b><span style=\"font-weight: 400\"> Originating from the Amarkantak Plateau, the Narmada is one of the major west-flowing rivers in India. It flows through a rift valley and empties into the Arabian Sea. The river is known for its picturesque scenery, waterfalls, and hydroelectric projects.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Mahanadi River:<\/b><span style=\"font-weight: 400\"> The Mahanadi rises near Sihawa in the Raipur district of Chhattisgarh and runs through Odisha to discharge its water into the Bay of Bengal.\u00a0 The Mahanadi basin lies predominantly in Chhattisgarh and Odisha, with smaller portions extending into Maharashtra, Madhya Pradesh and Jharkhand.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Godavari River:<\/b><span style=\"font-weight: 400\"> The Godavari is the largest peninsular river system.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Godavari rises at Trimbakeshwar near Nashik in Maharashtra and flows eastward into the Bay of Bengal.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">In its deltaic reaches near Rajamahendravaram (Rajahmundry), the Godavari divides into distributaries and forms an extensive delta.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Tributaries include the Penganga, the Indravati, the Pranhita, and the Manjra.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Krishna River:<\/b><span style=\"font-weight: 400\"> Krishna is the second largest east-flowing peninsular river, and it rises near Mahabaleshwar in the Sahyadri. Tributaries include Koyna, Tungabhadra and Bhima.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Cauvery River:<\/b><span style=\"font-weight: 400\"> It rises in the Brahmagiri hills of Kodagu district in Karnataka. The upper catchment area receives rainfall during the southwest monsoon season, and the lower part during the northeast monsoon season.\u00a0<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Cauvery is a perennial peninsular river, with its flow sustained by monsoon rainfall from both the southwest and northeast monsoons, although discharge varies seasonally.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Drainage System of India Importance<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">River water in India is vital for sustaining agriculture, providing drinking water, and generating hydroelectric power. The drainage system of India, comprising its major rivers, tributaries and drainage basins, plays a crucial role in meeting these needs.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Irrigation<\/b><b>:<\/b><span style=\"font-weight: 400\"> The large-scale diversion of river water for irrigation supports agricultural activities, especially in the fertile plains of northern India.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Hydroelectric Power:<\/b><span style=\"font-weight: 400\"> Many rivers, particularly in the Himalayan and hilly regions, have been dammed to harness hydroelectric power. Examples include the Bhakra Nangal Dam (Sutlej River) and the Tehri Dam (Bhagirathi River).<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Drinking Water Supply: <\/b><span style=\"font-weight: 400\">Rivers are critical sources of potable water for both urban and rural populations.\u00a0<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Programmes such as the National Mission for Clean Ganga aim to reduce pollution and restore the ecological health of the Ganga, thereby improving water quality and supporting human and ecosystem needs.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Inland Navigation:<\/b><span style=\"font-weight: 400\"> River systems, especially in the Ganga-Brahmaputra basin, are being developed for inland waterways to facilitate cargo transportation.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Flood Control:<\/b><span style=\"font-weight: 400\"> Some rivers, particularly in the north, are prone to flooding. Various flood management projects and embankments are constructed to mitigate flood risks.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Drainage System of India Challenges<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">The drainage system of India faces severe challenges from heavy pollution, erratic climate patterns, and escalating inter-state water disputes. Major challenges include<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Severe Pollution:<\/b><span style=\"font-weight: 400\"> Billions of litres of untreated sewage and industrial waste enter major rivers daily, driving bacteria levels thousands of times above safe limits and endangering aquatic life like the Ganges River dolphin.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Climate Change and Flow Variability:<\/b><span style=\"font-weight: 400\"> Climate change is altering precipitation patterns, snow and glacier dynamics and the frequency of extreme events, increasing uncertainty in river flows and flood\u2013drought risks.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Inter-State and International Disputes:<\/b><span style=\"font-weight: 400\"> Competing demands for water allocation have triggered intense legal and political conflicts between states (such as Karnataka-Tamil Nadu or Odisha-Chhattisgarh) over rivers like the Kaveri and Mahanadi.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Over-Extraction and Resource Depletion:<\/b><span style=\"font-weight: 400\"> Heavy agricultural irrigation and rapid urban consumption outpace natural monsoon replenishment, depleting base flows and lowering groundwater tables.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Ecological Fragmentation:<\/b><span style=\"font-weight: 400\"> Dams, barrages and embankments can alter natural flow regimes, sediment transport and fish migration, affecting downstream river and delta ecosystems.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Drainage System of India Way Forward<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Addressing the challenges facing the river drainage system of India requires a shift from fragmented, crisis-driven management to integrated, ecologically sound policies.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Integrated Water Resources Management (IWRM):<\/b><span style=\"font-weight: 400\"> Adopt a holistic \"basin-wide\" planning approach rather than managing rivers by administrative state boundaries. Establishing empowered river basin authorities can help balance upstream and downstream needs.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Decentralised Sewage Treatment:<\/b><span style=\"font-weight: 400\"> Shift away from massive, energy-intensive treatment plants toward decentralised, nature-based solutions (like constructed wetlands). Strictly enforce zero-liquid discharge norms for industries.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Climate-Resilient Agriculture:<\/b><span style=\"font-weight: 400\"> Promote micro-irrigation (drip and sprinkler systems), incentivise crop diversification away from water-intensive crops like paddy and sugarcane in water-stressed regions, and scale up rainwater harvesting.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Institutionalised Dispute Resolution:<\/b><span style=\"font-weight: 400\"> Strengthen inter-state river water disputes tribunals by enforcing time-bound decisions and establishing data-sharing platforms to build trust between states.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Restoring Environmental Flows (E-Flows)<\/b><span style=\"font-weight: 400\">: Mandate and enforce minimum ecological flow requirements for all dammed rivers to sustain aquatic ecosystems, transport sediments, and maintain the river's self-purifying capacity.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Drainage System of India UPSC PYQs<\/span><\/h2>\r\n<p><b>Q1:<\/b><span style=\"font-weight: 400\"> What is water stress? How and why does it differ regionally in India? <\/span><b>(UPSC Mains 2019)<\/b><\/p>","protected":false},"excerpt":{"rendered":"<p>The drainage system of India is classified mainly into the Himalayan and Peninsular drainage systems. Check out more about the Himalayan and Peninsular drainage systems and associated rivers.<\/p>\n","protected":false},"author":35,"featured_media":30615,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[38,24],"tags":[2092,40,620],"class_list":["post-30579","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-notes","category-upsc-geography-notes","tag-drainage-system-of-india","tag-quest","tag-upsc-geography-notes"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/30579","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/users\/35"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/comments?post=30579"}],"version-history":[{"count":4,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/30579\/revisions"}],"predecessor-version":[{"id":30623,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/30579\/revisions\/30623"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media\/30615"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media?parent=30579"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/categories?post=30579"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/tags?post=30579"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}