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Floods in polluted rivers can pollute groundwater too: Study

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Floods in polluted rivers can pollute groundwater too: Study

[vc_row][vc_column][vc_column_text]File photo of the floods that submerged large parts of Chennai in December 2015. Photo credit: PTI

~By Bhavya Khullar

Scientists from Anna University studied groundwater samples taken before and after Chennai floods of December 2015 to probe effect of floods on water quality

New Delhi: A new study has pointed out that flooding in polluted rivers has the potential to make groundwater unsafe for human use.

In December of 2015, when Chennai was flooded and people were marooned, a team of scientists from Anna University was collecting groundwater samples along the Adyar river to investigate if the groundwater in this region was fit for human consumption.

Researchers collected water samples from 17 locations in December 2015 and April 2016, that is, during and after floods. They tested the samples for salt and heavy metal concentration, microbial load and their susceptibility to available antibiotics.

“We wanted to know if the city water met water quality parameters laid down by the Bureau of Indian Standards during and post-flood”, Lakshmanan Elango, professor at the Department of Geology of Anna University, who led this study, told India Science Wire.

The results showed that heavy metal and microbial load in groundwater samples was high. The samples contained microbes such as Enterobacter, Staphylococcus, Escherichia, Streptococcus, Vibrio, and Salmonella that are known to cause infections like dysentery, cholera, and typhoid in humans. These microbes were cultured with various antibiotics used in clinical practice to treat life-threatening infections, to know they were susceptible or resistant to drugs.

“The bacteria were sensitive to most antibiotics but some were resistant to nalidixic acid, which is alarming as antibiotic resistance can rapidly spread in the environment”, said Prof Elango. The results of the study have been published in journal Nature Scientific Data.

In addition, scientists found high genetic similarity between bacteria from various locations implying that they must have originated from a single domestic sewage source containing fecal matter. “Sewage must have washed off with flood water, which in turn inundates the wells that would have resulted in contaminating the ground water”, believes Prof Elango.

“Our findings show that floods have the potential to impact the microbial quality of ground water in affected areas. Based on our study, we advise that wells must be chlorinated and the public must be warned to avoid consuming ground water for drinking, at least for some months post floods”, he added.

The research team included Ganesan Gowrishankar, Ramachandran Chelliah, Sudha Rani Ramakrishnan, Vetrimurugan Elumalai, Saravanan Dhanamadhavan, Kartikeyan Brindha, Usha Antony, and Lakshmanan Elango. It was done in collaboration with the University of Zululand in South Africa and the National University of Singapore, and was funded by the Department of Science and Technology (DST).

(This article has not been edited by the APNLive staff. It is from an auto-generated syndicated feed provided by the India Science Wire)[/vc_column_text][/vc_column][/vc_row]

India News

Mamata Banerjee warns BJP, EC over Bengal polls, says they will be accountable

Mamata Banerjee holds BJP and Election Commission responsible for any incidents during Bengal polls, raising concerns over officer transfers.

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West Bengal Chief Minister Mamata Banerjee has held the Bharatiya Janata Party (BJP) and the Election Commission of India responsible for any untoward incidents in the state during the upcoming assembly elections, following the transfer of key officials.

Addressing concerns over administrative reshuffles, Banerjee said that changes involving senior bureaucrats, including the chief secretary and home secretary, could affect governance and law and order in the state during a crucial period.

The Trinamool Congress chief also announced candidates for 291 constituencies for the elections scheduled to be held in two phases on April 23 and 29.

Criticising the Election Commission, Banerjee alleged that the transfers were being carried out in a manner that benefits the BJP. She questioned the timing of the decisions and said such actions weaken the state administration at a sensitive time.

She further raised concerns about disaster management and essential services, stating that experienced officials familiar with the state’s situation have been replaced. According to her, this could impact administrative efficiency if any emergency arises before the new government is formed.

Protecting Bengal’s identity

Banerjee emphasised that the election is not merely about forming a government but about safeguarding Bengal’s identity and existence. She accused the BJP of misusing central agencies and attempting to influence the electoral process.

She urged that elections should be conducted peacefully, without external interference, and in line with democratic principles. The chief minister also expressed confidence that her party would return to power with a stronger mandate.

Appealing to voters, she called for support for the Trinamool Congress, asserting that the people of Bengal will ultimately decide the outcome and protect their democratic rights.

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Centre assures action on LPG supply disruption, court closes distributors’ plea

The Bombay High Court closed a plea by LPG distributors after the Centre assured diplomatic efforts to stabilise supply amid global disruptions.

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LPG cylinder

The Union government on Tuesday informed the Bombay High Court that it is taking diplomatic steps to address disruptions in Liquefied Petroleum Gas (LPG) supply linked to the ongoing Iran-Israel conflict, following which the court disposed of a petition filed by LPG distributors.

Appearing before the Nagpur bench, Solicitor General Tushar Mehta said the Centre was actively engaged in international-level negotiations to stabilise LPG supply. However, he noted that specific measures could not be disclosed due to their sensitive nature.

The matter was heard by a division bench comprising Justices Anil S Kilor and Raj D Wakode. The bench accepted the government’s assurances and closed the plea.

Distributors flagged supply disruption in Vidarbha

The petition was filed by six LPG distributors, including Omkar Sales, who raised concerns over disruptions in supply chains across Maharashtra’s Vidarbha region. They claimed the situation had led to a significant shortage of LPG for domestic consumers.

The distributors, dependent on Confidence Petroleum India Ltd (CPIL), alleged that despite directives prioritising domestic consumption, LPG was being diverted for export to capitalise on high international prices.

Government cites policy compliance, CPIL denies diversion

The petitioners referred to recent orders issued under the Essential Commodities Act and the Natural Gas (Supply Regulation) Order, 2026, which mandate prioritising household LPG supply during crises.

However, CPIL rejected the allegations, stating it was fulfilling pre-existing export commitments and had not violated any policy norms.

Court had earlier termed issue ‘serious’

During earlier hearings, the court had described the matter as “serious” and of “grave importance”, issuing notices to the Centre and the Ministry of Petroleum and Natural Gas.

On Tuesday, the Centre reiterated that macro-level supply challenges arising from global geopolitical tensions were being handled through diplomatic channels. It also said that any localised supply issues could be resolved by state authorities.

Taking note of these submissions, the bench disposed of the petition.

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Om Birla likely to move motion to revoke suspension of 8 opposition MPs today

The Lok Sabha is likely to revoke the suspension of eight opposition MPs today, with a motion expected to be moved by the government following consensus on maintaining discipline.

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Om Birla

The suspension of eight opposition Members of Parliament in the Lok Sabha is expected to be revoked on Tuesday, with Speaker Om Birla likely to initiate the process, according to sources.

The MPs, including seven from the Congress and one from the CPI(M), were suspended on February 3 for unruly conduct during the first phase of the Budget session after a resolution was adopted by the House.

Motion to be moved in Lok Sabha

Congress leader K Suresh said that Parliamentary Affairs Minister Kiren Rijiju is expected to move a motion around noon seeking revocation of the suspensions.

Although the suspension was initially imposed for the entire session, scheduled to conclude on April 2, opposition parties have consistently demanded reconsideration since the second phase of the session began on March 9.

Agreement on maintaining decorum

At a recent meeting convened by the Speaker, both ruling and opposition sides reportedly agreed on maintaining discipline in the House.

Key understandings include:

  • No member will enter the well of the House to protest
  • Papers will not be torn or thrown toward the Chair
  • MPs will not climb onto officials’ tables

The Lok Sabha Secretariat has also reminded members to keep areas within the Parliament premises obstruction-free to ensure smooth movement.

Speaker raises concern over conduct

Earlier, Om Birla had expressed concern over the use of banners, placards, and inappropriate language by some MPs. In a letter to party leaders, he stressed the need to uphold the dignity and traditions of parliamentary democracy.

He had also indicated that actions like suspension are taken in cases of serious misconduct, such as climbing onto tables during proceedings.

Suspended MPs

The suspended MPs include Gurjeet Singh Aujla, Hibi Eden, C Kiran Kumar Reddy, Amarinder Singh Raja Warring, Manickam Tagore, Prashant Padole, Dean Kuriakose (Congress), and S Venkatesan (CPI-M).

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