Study/source reference: the installation campaign began on 29 September 2026; USDMA notice of 14 October 2026
Actual publication date: 20 October 2026
Geography-disaster management: GLOF risk and monitoring technology
News context:
According to the Indian Express's report of 30 September 2026, the state's first early warning system for any glacial lake in Uttarakhand is being installed at Vasundhara Tal in Chamoli. On 29 September, Chief Secretary Anand Bardhan flagged off the scientific-technical team of CBRI Roorkee and the Wadia Institute of Himalayan Geology; this campaign, scheduled from 29 September to 15 October, had the support of the SDRF, NDRF and ITBP.
According to USDMA's notice of 14 October 2026, the team returned after successfully completing the first phase of the system's installation; Disaster Management secretary Vinod Kumar Suman welcomed the team. This campaign ran under the National Glacial Lake Outburst Flood (GLOF) Risk Mitigation Programme. In the background were August's flood in Nepal (which a USGS analysis linked to a landslide and debris flow) and the Dharali (Uttarkashi) disaster a year earlier, after which a step was taken beyond mapping towards real-time monitoring.
Location: Chamoli, Uttarakhand; a high-Himalayan glacial lake
Institutions: CBRI Roorkee + Wadia Institute of Himalayan Geology; USDMA coordination
Technique: a set of sensors + Iridium satellite communication + solar power
First phase complete; full system implementation and other lakes remain
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What Will Be Monitored?
According to USDMA, the lake carries an all-in-one weather sensor (wind speed and direction, rainfall, solar radiation, temperature, air pressure), floating and submerged water-level sensors for the water level, accelerometer and tilt sensors for vibration and slope, a snow-depth sensor for the depth of snow and temperature sensors.
Because there is no ordinary mobile network in the remote high-Himalayan area, data communication will use Iridium satellite technology; a solar panel and a battery of 280 ampere capacity will give a backup of about ten days. In normal conditions the sensors will send readings every two hours to CBRI Roorkee's and USDMA's dashboards; in an emergency a message will go immediately, without waiting for the interval. For the equipment, a steel modular foundation without cement has been built, designed to withstand winds of up to 100 km/h.
The Lake and the Risk Classification:
According to CBRI scientist and campaign-team head Dr D. P. Kanungo, Vasundhara Tal's depth is about 38.50 metres, width 600 metres and length 900 metres; compared with earlier figures, no notable change in size was seen.
According to the Indian Express, the NDMA has identified 13 high-risk glacial lakes in Uttarakhand, of which five are Category-A (highest risk), and Vasundhara Tal is among them. Of the 13 lakes, six are in Pithoragarh, four in Chamoli and one each in Bageshwar, Tehri Garhwal and Uttarkashi. The National Remote Sensing Centre (NRSC) identified 344 glacial lakes in the state in 2023; bathymetric surveys of six lakes have been completed, which will help in assessing the scale of a possible GLOF.
Prelims: practice questions
Question 1. In what sense is the Vasundhara Tal system the state's first?
(a) The state's first glacial-lake early warning system
(b) The state's first flood-control dam
(c) The first Himalayan hydroelectric plant
(d) The first earthquake-monitoring laboratory
See answer and reason
Answer: (a). IE: the state's first EWS for any glacial lake; installation from 29 September, first phase complete on 14 October.
Question 2. Choose the correct statement about the monitoring system:
1. Data communication will use Iridium satellite technology.
2. Normally, readings will go to the dashboard every two hours.
3. The system depends only on the mobile network.
(a) Only 2 and 3
(b) Only 1 and 2
(c) Only 1 and 3
(d) 1, 2 and 3
See answer and reason
Answer: (b). USDMA: Iridium + solar/battery; Statement 3 is wrong - the mobile network is not available there.
Question 3. Per the NDMA's risk classification, which pair is correct?
(a) 5 high-risk lakes; 13 Category-A
(b) 344 high-risk lakes; all in Chamoli
(c) 13 high-risk lakes; 5 Category-A; Vasundhara Tal included
(d) No classification
See answer and reason
Answer: (c). IE: of the NDMA's 13 high-risk lakes, five are Category-A; 344 is the NRSC's count (2023) of total lakes.
Sources:
Indian Express: the state's first glacial-lake EWS, 30 September 2026
USDMA: first phase of EWS installation at Vasundhara Tal complete, 14 October 2026
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