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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

Eknath Shinde’s helicopter returns to Mumbai mid-flight due to bad weather

Maharashtra Deputy Chief Minister Eknath Shinde’s helicopter was forced to return to Mumbai after the pilot detected approaching storm conditions during a flight to Thane district.

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A helicopter carrying Maharashtra Deputy Chief Minister Eknath Shinde was forced to return to Mumbai on Thursday after encountering adverse weather conditions during a flight to Thane district.

According to officials, Shinde had departed from Mahalaxmi Racecourse in south Mumbai around 3.30 pm and was travelling to Murbad in Thane district to attend a wedding function related to a party worker’s family.

The helicopter reportedly reached the Airoli area in Navi Mumbai when the pilot noticed an approaching storm and informed the deputy chief minister about the deteriorating weather conditions. Following the alert, the flight was turned back as a precautionary measure.

The helicopter later landed safely at the Pawan Hans facility in Juhu, Mumbai. Officials said Shinde was accompanied by members of his staff, including personal assistant Prabhakar Kale, special executive officer Balsingh Rajput and media adviser Vinay Patrdukar.

The incident comes amid changing weather conditions and storm activity reported in parts of Maharashtra in recent days.

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Nitish Kumar’s son Nishant among 32 inducted in Bihar cabinet expansion

Nishant Kumar entered the Bihar cabinet for the first time as 32 ministers from NDA allies took oath in a major expansion of the state government.

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Bihar government cabinet

A major cabinet expansion took place in Bihar on Thursday, with 32 leaders from the ruling NDA alliance inducted into the state government. Among the prominent names was Nishant Kumar, son of former Bihar chief minister Nitish Kumar, who entered the cabinet for the first time.

The expansion included representatives from all major NDA allies in the state. According to reports, the BJP secured 15 ministerial berths, while JD(U) got 13 positions. Two ministers were inducted from Lok Janshakti Party (Ram Vilas), while Hindustani Awam Morcha and Rashtriya Lok Morcha received one berth each.

The oath-taking ceremony was held in Patna in the presence of senior NDA leaders, including Prime Minister Narendra Modi, Union Home Minister Amit Shah and Defence Minister Rajnath Singh.

Nishant Kumar’s induction comes weeks after he formally entered active politics. His entry into the Bihar cabinet is being viewed as a significant development for JD(U), which had long projected an anti-dynasty image under Nitish Kumar’s leadership.

The cabinet reshuffle follows Nitish Kumar’s move to the Rajya Sabha earlier this year and the formation of the government led by Chief Minister Samrat Choudhary.

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PM Modi marks Operation Sindoor anniversary, calls it India’s firm stand against terrorism

PM Modi said Operation Sindoor showcased India’s firm response against terrorism while paying tribute to the armed forces on the operation’s first anniversary.

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PM Modi

Prime Minister Narendra Modi on Thursday said Operation Sindoor demonstrated India’s firm response against terrorism and highlighted the country’s commitment to national security.

Marking one year of the operation, the Prime Minister praised the courage, precision and professionalism of the Indian armed forces. He said the military action was carried out in response to the Pahalgam terror attack that had claimed the lives of 26 civilians in 2025.

Operation Sindoor was launched on May 7, 2025, as a calibrated tri-services operation targeting terror infrastructure linked to cross-border terrorism. Reports said the operation showcased coordinated action by the armed forces and was seen as a major counter-terror response by India.

On the anniversary of the operation, PM Modi also changed the display pictures across his social media platforms, including X, Facebook, Instagram and WhatsApp. The image carried the text “Operation Sindoor” along with the Indian tricolour design.

The Indian Air Force also shared visuals and messages recalling the operation and highlighting India’s military response. A video released by the force described the operation as a strong message against terrorism and referred to the precision strikes carried out during the mission.

Operation Sindoor was launched following the Pahalgam terror attack, after which India carried out strikes on terror camps in Pakistan and Pakistan-occupied Kashmir, according to official statements and reports published at the time.

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