{"id":58341,"date":"2025-08-06T11:36:19","date_gmt":"2025-08-06T06:06:19","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=58341"},"modified":"2025-08-06T11:36:19","modified_gmt":"2025-08-06T06:06:19","slug":"flash-floods-in-uttarkashi-causes-topography-and-climate-change-risks-explained","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/flash-floods-in-uttarkashi-causes-topography-and-climate-change-risks-explained\/","title":{"rendered":"Flash Floods in Uttarkashi: Causes, Topography, and Climate Change Risks Explained"},"content":{"rendered":"<h2><b>Flash Floods in Uttarkashi Latest News<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At least four people died as flash floods and mudslides struck Dharali village in Uttarkashi, Uttarakhand, damaging several buildings, shops, and hotels.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">While cloudbursts are common triggers of flash floods in Uttarakhand\u2019s hilly regions, the recent incident was not due to a technical cloudburst but rather sustained heavy rainfall over the past three days.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The region\u2019s topography, prone to landslides during intense rains, caused mud and debris to surge into rivers, leading to destructive flash floods downstream.<\/span><\/li>\n<\/ul>\n<h2><b>Topography of Uttarkashi<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uttarkashi district ranges from 800 to 6,900 metres above sea level, with vast snow-covered areas and several glaciers.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It houses the source regions of the Ganga (Gangotri) and Yamuna (Yamunotri) rivers.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The terrain is rugged, with high ridges, perennial rivers, narrow valleys, and deep gorges.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Land slopes sharply southwest, with valley drops of up to 800 metres.<\/span><\/li>\n<\/ul>\n<h2><b>Rainfall Pattern in Uttarkashi<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uttarkashi receives an average annual rainfall of 1,289 mm, with the southwest monsoon (June-September) bringing maximum rainfall, especially in southern areas.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The highest recorded rainfall was 2,436 mm in 1969. July is the wettest month, averaging 312 mm.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The district is also prone to frequent thunderstorms in its hilly regions.<\/span><\/li>\n<\/ul>\n<h2><b>Flash Flood<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A flash flood is a sudden, intense flood that occurs within a very short period (usually within 6 hours) of heavy rainfall, dam\/levee failure, or sudden release of water (like glacier bursts or cloudbursts).\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flash floods are characterized by:<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Rapid onset and high intensity.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Localized impact, often affecting mountainous or hilly terrains.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Triggered by localized heavy rain, cloudbursts, glacial lake outbursts (GLOFs), or infrastructure failures.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The distinguishing factor between a flood and a flash flood is the amount of time it takes for the flood to occur.<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">A flash flood occurs within minutes or hours. A flood occurs more gradually.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flash floods are often more dangerous because they occur with little warning.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Their quick nature makes them much more powerful than floods, and they often become raging torrents of water, sweeping away everything in their path.<\/span><\/li>\n<\/ul>\n<h2><b>Factors Behind Uttarkashi Flash Floods<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Continuous rainfall over the past few days, combined with Uttarkashi\u2019s fragile topography, triggered mudslides, debris flows, and flash floods.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Climate change-induced intense rainfall and accelerated glacier melting further worsened the situation.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Rainfall of any intensity, if continuous, recorded over such high altitudes where Uttarkashi is located, can be disastrous.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">That is because this region is built on layers of mudslides over the past several centuries.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uttarkashi district is situated along the southern Himalayan slope, where there is limited vegetation and no significant obstruction.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mild triggers such as rainfall or earthquakes can cause loose moraine and soil to easily slither downhill, swallowing homes and roads along its path.<\/span><\/li>\n<\/ul>\n<h3><b>Glacial Avalanche or Lake Breach Suspected<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Satellite imagery confirmed the presence of large glaciers and at least two glacial lakes directly above the affected area.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Experts suspect a <\/span><span style=\"font-weight: 400;\">sudden release of water from a glacier burst or a GLOF could have unleashed the destructive torrent<\/span><span style=\"font-weight: 400;\">, similar to the 2021 Raini disaster in Chamoli.\u00a0<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">In that incident, a rock-ice avalanche devastated hydropower projects and caused over 200 deaths.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">According to the Wadia Institute of Himalayan Geology, Uttarakhand has 1,266 glacial lakes, many of which pose severe risks to downstream communities.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The National Disaster Management Authority (NDMA) has identified 13 glacial lakes as high-risk, with five classified as extremely dangerous due to their potential for sudden breaches.<\/span><\/li>\n<\/ul>\n<h2><b>Why Uttarkashi Rainfall Was Not a Cloudburst<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">According to IMD, <\/span><span style=\"font-weight: 400;\">a cloudburst requires 100 mm rainfall in an hour over a 10&#215;10 km area<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uttarkashi recorded only 2.7 mm in 24 hours till 8:30 am on August 5, with rainfall throughout the day remaining below cloudburst thresholds.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Though heavy rains occurred in Uttarakhand, such as 300 mm in Haridwar, Uttarkashi\u2019s event did not meet cloudburst criteria.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cloudbursts cause widespread destruction\u2014collapsing houses, disrupting transport, and leading to significant casualties.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The growing frequency of these events necessitates robust disaster management policies, better infrastructure planning, and proactive global and national intervention, as urged by the 2023 research paper.<\/span><\/li>\n<\/ul>\n<p><b>Source:<\/b> <a href=\"https:\/\/indianexpress.com\/article\/explained\/explained-climate\/heavy-rainfall-rugged-topography-what-caused-flash-floods-in-uttarkashi-10171931\/\" target=\"_blank\" rel=\"nofollow noopener\"><span style=\"font-weight: 400;\">IE<\/span><\/a><span style=\"font-weight: 400;\">\u00a0| <\/span><a href=\"https:\/\/timesofindia.indiatimes.com\/india\/glacier-collapse-or-lake-burst-likely-caused-dharali-destruction-experts\/articleshowprint\/123127901.cms\" target=\"_blank\" rel=\"nofollow noopener\"><span style=\"font-weight: 400;\">ToI<\/span><\/a><span style=\"font-weight: 400;\">\u00a0| <\/span><a href=\"https:\/\/economictimes.indiatimes.com\/news\/india\/not-a-cloudburst-if-uttarkashi-didnt-see-heavy-rain-heres-what-experts-say-may-have-caused-dharalis-deadly-flood\/articleshow\/123130901.cms?UTM_Source=Google_Newsstand&amp;UTM_Campaign=RSS_Feed&amp;UTM_Medium=Referral\" target=\"_blank\" rel=\"nofollow noopener\"><span style=\"font-weight: 400;\">ET<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Flash floods in Uttarkashi triggered by glacier burst or GLOF, not cloudburst. Understand the region&#8217;s fragile topography and rising risks.<\/p>\n","protected":false},"author":18,"featured_media":58364,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[2038,60,22,59],"class_list":{"0":"post-58341","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-mains-current-affairs","8":"tag-flash-floods-in-uttarkashi","9":"tag-mains-articles","10":"tag-upsc-current-affairs","11":"tag-upsc-mains-current-affairs","12":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/58341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=58341"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/58341\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/58364"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=58341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=58341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=58341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}