DRP 060524: Study on dam induced river flooding in Peninsular India

May 6, 2024February 28, 2026 SANDRPLeave a comment

(Feature Image: (a) Locations of streamflow gauges with catchment boundaries in six major river basins of Peninsular India, (b) elevation map and mean annual maximum runoff rate (streamflow per unit catchment area), (c) Aridity Index (AI) and (d) Baseflow Index (BFI). The maps in first row are prepared in QGIS (Version 2.14.0 ‘Essen’ (2016), URL: http://qgis.org) and the maps in second row are generated using R (Version 4.2.2 (2022), URL: https://www.R-project.org/). Source: Baseflow significantly contributes to river floods in Peninsular India )

A recently published study, see details given below throws light on the role of groundwater contribution to baseflow in rivers and their flooding in Peninsular India’s river like Narmada, Tapi, Mahanadi, Godavari, Krishna and Cauvery. The found that while baseflow contributes more to river flows, its share in the flood event flow magnitude decreases as surface runoff accounts for a larger proportion of flood discharge on the day of the flood.

Most significant are the findings related to dam induced flood that SANDRP has been writing for long and the finding corroborate exactly what SANDRP has been saying: Sudden releases of water from a dam can raise river levels during extreme rainfall events, especially when the dam is nearly full. The impact of sudden floods is more destructive because people living in nearby areas are often unprepared. Without a dam, floodwaters rise slowly over time, allowing people to take preventive measures. However, sudden floods caused by dam releases offer little or no time to prepare, increasing the risks associated with dam-induced flood hazards. Furthermore, the construction of dams alters the natural regime of rivers, leading to changes in sediment transport and erosion patterns. These changes can heighten the risk of flooding downstream from a dam.

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DRP News Bulletin

DRP 150424: Supreme Court’s order on right to be free from climate change impact is welcome, BUT…

April 15, 2024February 28, 2026 SANDRPLeave a comment

(Feature Image: Polluted Hindon river flowing through Ghaziabad in March 2024. Bhim Singh Rawat/SANDRP)

On March 21, 2024, a case related to the Grean Indian Bustard, a critically endangered bird – numbering less than 150 individuals – has led the Supreme Court of India to expand citizens’ constitutional right to life and equality to include the right to be free from the adverse impact of climate change. The PIL filed by M.K. Ranjitsinh asked to protect the GIB from extinction. In 2021, in this PIL, the Supreme Court had passed directions restricting and regulating power lines and renewable energy projects in an area of 99,000 sq km in Rajasthan and Gujarat.

The Supreme Court’s latest order modified directions passed in the earlier judgment. Chief Justice D.Y. Chandrachud – writing for the 3-judge bench including Justices J.B. Pardiwala and Manoj Mishra – has expanded the contours of environmental jurisprudence: from the oft-repeated polluter pay principle–precautionary principle–public trust doctrine to the larger arena of climate justice, environmental inequity and gender justice. However, in the process, the protection the SC gave through earlier order has been withdrawn.

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DRP News Bulletin

DRP 250324: Celebrating 50 years of Chipko Movement and Message

March 25, 2024February 28, 2026 SANDRPLeave a comment

(Feature Image: A photo taken in March 1974 of people in Raini village, Uttarakhand, a few days after they protested against the felling of trees in order to make tennis racquets. Source: Varsha Singh/Third Pole report dated 30 Nov. 2022. The original photograph was taken on 30 March, 1974 by Chandi Prasad Bhatt and has been reproduced in The Third Pole with permission)

As we celebrate the golden jubilee of Chipko Movement, one of the most iconic and memorable environmental movements of India, we need to remember the key messages of the movement. It may seem gloomy situation at the place where the movement originated in Raini village in Chamoli district of Uttarakhand. In fact, as we travel from Raini to Chamoli to Uttarakhand and beyond, as far as environmental situation is concerned, there is not too much around us to celebrate about.

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Dams, Rivers & People

DRP 110324: Bangalore reminds us: Ignore groundwater at your own peril

March 11, 2024February 28, 2026 SANDRPLeave a comment

(Feature Image: People stand in a queue with water cans to get drinking water at Jnana Jyothi Nagar, in Bengaluru. Image Source: PTI/Live Mint, 10 March 2024)

One central lesson of the ongoing Bangalore water crisis is essentially that ignore groundwater sustainability at your own peril. The surface water availability in Bangalore has not decreased, it is the groundwater depletion that is leading to crisis. There is of course the expansion of the city both horizontally and vertically that is increasing demands, but simple arithmetic tells us that if groundwater levels are sustained, it can take care of these increased demands.

The Groundwater sustainability includes sustaining the groundwater recharge and ensuring that extraction does not go past the recharge. Sustaining the groundwater recharge means first understanding the groundwater recharge mechanisms, zones and protecting them. BDA has been sitting for four years on desilting of two lakes: Bellandur and Varthur, which has caused huge impact on groundwater depletion. It also means increasing the groundwater recharge through rainwater harvesting (Bangalore’s failure here is apparent from the fact that government is collecting crores of rupees as fines from those not following the mandatory rainwater harvesting requirements), groundwater recharge wells and diverting tertiary treated sewage, available in Bangalore of upto 300 Million Liters per Day, to lakes and other such recharge zones.

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DRP News Bulletin

DRP 260224: Karnataka faces Drought, Farmer Distress, water scarcity

February 26, 2024February 28, 2026 SANDRP1 Comment

(Section 144 imposed near Bhadra Canals to stop illegal water lifting amid supply crisis. Representational image. TNIE)

As the two reports from media today shows, Karnataka is facing drought in 223 of 236 talukas, water scarcity and even farmer distress and suicides. The state government is aware of the situation and taking necessary measures. The situation could be similar in a number of states including Maharashtra, Telangana, Andhra Pradesh and even some of the eastern and northern states. The North Himalayan states have experienced hugely below normal snowfall in the ongoing winter. The Winter Rainfall at all India level for the period Jan 1 2024 to Feb 25 2024 is already 31% below normal.

There is role of global warming and El Nino in this and these factors are going to persist at least till the end of Indian Summer. So the governments both at centre and in states needs to be ready for the crisis.

The current Karnataka govt is awake to reality and seems to be taking the appropriate steps. Karnataka had deficit rainfall in SW Monsoon 2023.

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DRP News Bulletin

DRP 120224: Report of Parl Com on Yamuna wants 23 cumecs water in the river

February 12, 2024February 28, 2026 SANDRP1 Comment

(Feature Image: Flowless Yamuna downstream Vyasi HEP, Dehradun in June 2023. Bhim Singh Rawat/SANDRP)

In a welcome move, the Parliamentary Committee report on Yamuna River has suggested at least 23 cumecs (Cubic Meters for Second) water needs to be released from Hathnikund barrage at least in nine non monsoon months from Oct to June as per the recommendation of the National Institute of Hydrology, a govt of India body. The report has said that almost no water is being released for the river from the Wazirabad barrage in Delhi.

The 10 cumecs water now being released (how regularly even this is being released is also a question) is inadequate as most of it evaporates or percolates soon after it is released. The committee has asked the Union Jal Shakti Minister to take urgent steps in this direction. In fact, the committee should have given a time limit for this. We hope these urgent steps will be taken soon.

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DRP News Bulletin

DRP 050224: IMD needs to improve forecasting and sharing, but doing the opposite?

February 5, 2024February 28, 2026 SANDRP4 Comments

(Feature Image: Climate change catoon by Jug Suraiya & Partho Sengupta. ToI, 23 June 2018)

The decision of the IMD to shut down 199 of its district agromet units across India is disturbing on a number of counts. In the era of climate change when the key parameters are undergoing such rapid change, there is need for increasing monitoring and sharing of climate information by the IMD and need to in fact decentralize the whole effort. But this decision of IMD is going against this basic requirement.

In fact, the IMD has become a sort of holy cow, while in reality its performance in monitoring, forecasting and sharing information in time is far from satisfactory. This is increasingly evident every year when IMD fails to provide not only accurate, actionable, rainfall forecasts sufficiently in advance to help reduce the flood disasters and also take timely decisions on reservoir operations, IMD also fails to provide even timely information about the actual rainfall on ground and how that rainfall is going to get converted to inflows in rivers and reservoirs. Similarly, the district agromet units can provide farmer level and decentralized accurate rainfall monitoring and forecasting information that can help farmers take timely decisions.

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DRP News Bulletin

DRP 290124: Wetlands and Human Wellbeing: So little reflected in wetlands governance

January 29, 2024February 28, 2026 SANDRP1 Comment

(Chest nut clutivators removing water hycinth from Giri taal of Kashipur in US Nagar, Uttarakhand in April 2023. Bhim Singh Rawat/SANDRP)

As the world approaches the World Wetlands Day on Feb 2, we notice a proliferation of news related to wetlands, but mostly bad news in this week’s DRP NB: Loktak lake in Manipur facing impact of inland waterways project, the Supreme Court having to intervene for the Futula lake in Nagpur, TN Govt telling NGT that 38% of Pallikaranai marshland is under encroachment, in Bangalore, NGT is asking for response from KSPCB and others regarding the lake buffer zone encroachment. There is also a lot of bad news about the worsening state of our rivers, including Ganga.

One piece of good news is that people have come out with their own plan for restoration of Ennore wetland in TN. In Assam, Maguri Motapung Bill is regaining biodiversity after earlier being polluted by oil spill, but that is only control of damage earlier. Similarly, while it is good news that SC has intervened to protect Futula lake in Nagpur, but the fact that the govt wanted to encroach on it in the name of “temporary” construction is not at all good news.

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DRP News Bulletin

DRP 150124: The Catchment degradation in Cauvery Basin

January 15, 2024February 28, 2026 SANDRPLeave a comment

The study by Indian Institute of Science (IISc), Bangalore has brought to light one of the key reasons for the water problems of Cauvery basin: 12850 Sq km of Cauvery basin has lost natural vegetation over the fifty years between 1965 and 2016. The trend is likely to have continued, possibly at an accelerated pace in the eight years since 2016. It may be useful to assess the hydrological implications of this massive destruction of the Cauvery basin.

SANDRP has been highlighting that the reason for the more frequent floods and followed by water scarcity and drought, in spite of somewhat increased rainfall under changing climate is exactly this, the degradation of the Cauvery catchment, including destruction of local water bodies, groundwater recharging mechanisms and natural vegetation.

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Floods

Rivers Crossing Highest Flood Levels in Dec 2023

December 22, 2023December 22, 2023 SANDRPLeave a comment

During ongoing North East monsoon season at least six rivers have breached highest flood levels (HFLs) at their respective flood monitoring sites in December 2023. All of these HFL breach incidents have taken place in two states of Andhra Pradesh (3) and Tamil Nadu (3). Interestingly, all of these rivers are part of East Flowing Rivers (EFR) between Pennar and Kanyakumari basin. The details of HFL breach sites and rivers are given in table below.

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