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

May 6, 2024May 7, 2024 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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Yamuna River

Yamuna Manthan 030424: DDA Continues to Destroy River Floodplains

April 3, 2024May 1, 2024 SANDRP1 Comment

(Feature Image: Huge part of Yamuna floodplain raised by massive soil dumping near Bela Estate just upstream Shashtri Park Metro Depot in North East Delhi. Photo Credit: Vivek Nigam, Photo Journalist Amar Ujala, Source: Principal Correspondent in Amar Ujala, Delhi)

In latest example proving Delhi Development Authority’s (DDA) utter failure in protecting Yamuna River floodplains from abuse and encroachment, a large part of floodplain land has been levelled by soil dumping thus raising it by several meters at Bela Estate farm near Shashtri Park Metro Depot. As per the reports, the DDA has allotted about 19.5 ha of floodplain to forest dept for compensatory plantation. The plantation work at the site like at most of the sites on Yamuna floodplain in Delhi has suffered damages during July 2023 floods. And the levelling at the Bela Estate site is being done in the name of protecting the compensatory plantation.

The site is among few remaining floodplain patches available for spread of flood waters. The floodplain area on western bank at the location is less and already developed. Due to natural gradient, the part of floodplain on eastern side undergoes periodic floods. The patch was under several feet floodwater in July 2023. The floodplain immediately downstream the site has already been encroached by the bridge road, metro depot and buildings. Hence, raising of floodplain here would not only reduce spread of flood waters but also hamper the groundwater recharge.

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DRP News Bulletin

DRP NB 010424: As Krishna basin faces drought and scarcity, water diverted from the basin to Konkan

April 1, 2024May 1, 2024 SANDRPLeave a comment

(Feature image: Map of Bhivpuri Hydropower Project, one of the Tata Dams)

Large parts of South India, including Maharashtra are facing depleted reservoir levels with the beginning of summer and water scarcity. However, the Krishna Bheema basin, the second largest basin of peninsular India, is diverting water to outside the basin to Konkan. The Krishna Bheema basin has the largest live storages of Maharashtra in Koyna dam (1347.5 MCM) and Tata dams (617.67 MCM), but the water in those storages won’t be available to the drought hit residents of Krishna basin in water scarce Maharashtra, Karnataka, Telangana and Andhra Pradesh.

This is because Koyna and Tata dams divert the water from Krishna Bheema basins to Konkan for power generation. Even in March, according to Maharashtra Load Dispatch Centre, Koyna had generated 128.87 Million Units (MU) of power and Tata Dams had generated 130.47 MU, both by March 30. This implies diversion of millions of Cubic meters of water from Koyna and Tata Dams during March 2024, which mostly gone down from Konkan to Arabian sea.

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DRP News Bulletin

DRP NB 250324: Celebrating 50 years of Chipko Movement and Message

March 25, 2024March 25, 2024 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 News Bulletin

DRP NB 180324: Electoral Bonds disclosures confirm political economy of large dams

March 18, 2024March 18, 2024 SANDRPLeave a comment

(Feature Image: A controversy over alleged engineering lapses in the ₹1 lakh cr Kaleshwaram project on Godavari triggered an electoral slugfest. HT, 03 Nov. 2023)

The Electoral bonds details now in public domain, thanks to the Supreme Court of India orders, has once again highlighted the political economy of large dams, hydropower projects and irrigation projects. It has once again confirmed what was publicly known that such large water projects involve kickbacks to political parties.

The details so far available involves companies like Megha Engineering, Rithwick Projects Pvt Ltd, Navayuga Engineering Company Ltd, among others. The projects so far that seems to be involved include Polavaram Dam, Kaleshwaram Lift Irrigation Project, Sunni Dam and Hydro projects, Kundah Pump Storage Hydropower project in Tamil Nadu and Silkyara Tunnel, almost all of them also involved in some kind of disaster or other.

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Yamuna River

Yamuna Parliamentary Committee Report Missing on River Governance

March 12, 2024 SANDRPLeave a comment

(Feature Image: Solid waste strewn along east bank of polluted river Yamuna near Geeta Colony bridge, Delhi on March 09, 2024. Bhim Singh Rawat/SANDRP)

The Parliamentary Standing Committee on Water Resources has submitted its 27^th report titled “Review of Upper Yamuna River Cleaning Projects upto Delhi and Riverbed Management in Delhi” to the Parliament on 6 Feb 2024. The 113 paged report has two parts first on Narration and second on Observation and 25 Recommendations. The first part of the report has XI chapters dealing with various issues of River Yamuna.

SANDRP here presents a detailed chapter wise overview of the key observations made by the Committee based on the replies mainly from Department of Water Resources, River Development & Ganga Rejuvenation (DoWR, RD & GR) along with the Committee’s recommendations and some comments by SANDRP.

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Dams, Rivers & People

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

March 11, 2024March 11, 2024 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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Yamuna River

Yamuna Manthan 060324: Linking Plans Threatening Yamuna

March 6, 2024March 6, 2024 SANDRPLeave a comment

(Feature Image: PKC link index map. Source: Feasibility Report of Parbati Kalisindh Chambal Link Project. NWDA)

Yamuna the largest tributary of National River Ganga has already been succumbing on account of dams, hydro projects, unsustainable riverbed mining and ever-increasing pollution load in Himalayan, upper and middle segments. Despite this, the river has managed to be in better shape and size in its lower segment mainly due to its tributaries network including Chambal, Sind, Kali Sindh, Betwa, Ken etc. However, now there are river interlinking plans threatening the remaining relatively flowing and living stretch of the river in this very lower segment.

The push for country’s so called first river interlinking plan namely Ken-Betwa River interlinking is going on ignoring the norms, clearances and better viable alternatives. Now, the state governments of Madhya Pradesh and Rajasthan have signed agreement to prepare DPR for Parbati-Kalisindh-Chambal (PKC) river interlinking under modified Eastern Rajasthan Canal Project (ERCP).

The central government has termed the project of national importance and would share the 90 precent of it cost. The entire project is estimated to cost Rs. 72,000 crore and claimed to be built in 5 years. The project proposes interlinking of 6 Chambal rivers namely Parbati, Kalisindh, Kshipra, Kuno, Lakhunder, Mej, Kyul by at least 17 big and small dams and barrages.

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Dams, Rivers & People

DRP NB 040324: Ganga Water not fit for even bathing in Uttarakhand, UP, Bihar, W Bengal

March 4, 2024March 6, 2024 SANDRPLeave a comment

(Feature Image: A drain falling into Ganga in Varanasi. Source: Amar Ujala)

A number of reports given below from this week shows that Ganga River water is not fit for even bathing at a number of locations in Uttarakhand, Uttar Pradesh, Bihar and W Bengal. These are all official statements, mostly given in reports submitted to judicial bodies or statements by the judicial bodies.

This shows how little progress has been achieved by the government, including by the Prime Minister, central and concerned state governments including by schemes like Namami Gange and scheme of National Mission for Clean Ganga and expenditure of tens of thousands of crores of rupees. This is in spite of the promises given in the past by the Prime Minister and Union Ministers including Nitin Gadkari to clean the river by deadlines that have come and gone.

The worst part is that if we look at the trajectory of various work being done in this regard, we see no hope of any improvement in the foreseeable future unless there is major change in the way this problem is dealt with. But how will such a major change happen?

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DRP News Bulletin

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

February 26, 2024February 28, 2024 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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