Feature image probably shows flooded human habitation along Cheyyeru river after Annamayya project failure on Nov. 19. However, caption of image published in Deccan Herald report does not mention it.
India has been witnessing unusual monsoon rains in 2021. First the delay in South West Monsoon[i] withdrawal till third week of October 2021 brought heavy rainfalls in several states of North India in the first half of October 2021. Then the extreme rainfall spells during North East Monsoon[ii] have caused floods in several parts of south India in quick succession in November 2021.
In October 2021, the all India rainfall has been 33% above normal while November rainfall being record breaking 86% above normal. The formation and interactions between low depressions and western disturbances largely contributed in record breaking rainfall events during this period including the onset of La Nina phenomena.
Continue reading “Rivers crossing HFLs in Oct-Nov 2021”
(Feature image River Betwa in flood spate on Aug. 4, 2021. Source: Sharad Chandra, Director, CWC)
While India has received 874.6 mm rainfall which falls in normal[i] category in just concluded south west monsoon season, there have been at least 27 incidents of rivers crossing the Highest Flood Levels (HFLs) ever recorded in the past and attaining new HFLs in 5 river basins (some composite basins) in India, as recorded by the Central Water Commission (CWC) Flood Forecasting site[ii] during the monsoon.
The maximum 12 such instances have taken place in Ganga basin followed by 6 in west flowing rivers Tapi to Tadri basin, 5 in Godavari, 2 in West Flowing rivers Tadri to Kanyakumari basin and 1 each in Subernarekha and Tapi basin.
For past three years, SANDRP has been tracking the HFL breach incidents during monsoon season. The analysis of such HFL breaches in 2018[iii], 2019[iv] and 2020[v] can be seen on our website.
Continue reading “Rivers that crossed Highest Flood Level in Monsoon 2021”
Flooding in Madhya Pradesh, late August 2020. Photo: MP Govt., flood list.
In 2020, south west monsoon season when rainfall was 8.74% above normal, rivers reached new Highest Flood Levels (HFLs) at least at 37 locations across the country, as per information available to SANDRP. Maximum 13 such instances come from Central and East India, each. Five instances happened in South India, three in North India and two in North East India. This article provides wise details and hydrographs of all these sites.
SANDRP has been tracking the Highest Flood Level (HFL) breach incidents during monsoon season. The analysis of such HFL breaches in 2018 and 2019 are available on our website. In 2018 we had listed 25 such instances though SW Monsoon rainfall was 9.4% below normal. In 2019 we listed 37 such instances when the SW Monsoon rainfall was 10% above normal.
Continue reading “Rivers That Reached New Highest Flood Level during Monsoon 2020”
In the monsoon season of 2019 Indian rivers have crossed Highest Flood Level (HFL) at around 37 Level Forecasting and Level Monitoring sites across the country. This account attempts basin wise details and description of HFL breached by the rivers.
Brahmaputra Basin (Assam)
In Brahmaputra basin 2 sites, 1 Aie NH Xing Level Monitoring site on River Aie in Barpeta district of Assam and Dhubri (Level Forecast) site on River Brahmaputra in Dhubri district of Assam narrowly crossed the HFL in July 2019.
Also River Barak at ANIPUR site in Karimganj district on May 24 and River Brahmaputra at Goalpara site in Goalpara district rose close to the HFL level on July 17, 2019. As per CWC (Central Water Commission) FF Website, Goalpara site has not crossed HFL since 1954.
Continue reading “Rivers That Reached New Highest Flood Level during Monsoon 2019”
Flood Forecasting (FF) is one of the important activities of Central Water Commission (CWC), which is undergoing expansion and improvement, but there is still a huge scope for improvement. In order to better understand the CWC’s flood monitoring and forecasting work, in this article, we have given an overview of CWC’s flood forecasting and monitoring sites in South India, the last region to be covered for 2019 flood season. It includes state wise list of CWC’s Level Forecast, Inflow Forecast and level monitoring sites in South Indian states of Andhra Pradesh, Telangana, Karnataka, Tamil Nadu, Puducherry (no FF sites) and Kerala. Similar report has been published for North India[i] and North East India[ii], East India[iii] and West India[iv]. Continue reading “South India Overview of CWC Flood Forecasting Sites 2019”
Kerala is facing serious floods. Army, Navy, NDRF, neighbouring states are all out. Dozens of people have died, landslides happening, houses washed away, the whole machinery is out to deal with the crisis.
In this flood crisis, Idukki & Idamalayar two of the Kerala’s biggest dams along with about two dozen others, are releasing water, adding to the floods and the disaster. Why are Idukki and Idamalayar, both having live storage capacity above a Billion Cubic Meters, releasing water NOW, when whole of Kerala is facing floods due to recent excessive rains? Standard excuse: The dams are full and they have no option but to release the water, they cannot store more. But why did they wait to start releasing water till the dams are full and they are faced with TINA: There is No Alternative. This love to be in TINA situation seems like a disease affecting all dam operators.
Continue reading “Idukki Dam releases water when Kerala is in Floods: Could this have been avoided?”