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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

India summons Ukrainian envoy after ships with Indian crew attacked in Black Sea

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India has summoned the Ukrainian Ambassador after two merchant vessels carrying Indian crew were attacked in the Black Sea, raising concerns over the safety of Indians working in the conflict zone.

The Ministry of External Affairs (MEA) described the incidents as a matter of serious concerns and conveyed India’s position directly to the Ukrainian envoy.

According to the MEA, the attacks took place amid the ongoing Russia-Ukrainian war, where commercial shipping has increasingly come under threat due to military operations. Although no deaths have been reported, several Indian seafarers were on board the affected vessels, prompting the government to seek immediate clarification from Ukraine and stress the need to ensure their safety.

During the meeting, the MEA reiterated that merchant ships engaged in commercial trade and civilian crew members must not become targets during armed conflict. India urged Ukraine to take all possible steps to prevent such incidents and to uphold international maritime law, which protects civilian shipping operating in international waters.

The ministry said it is in constant contact with Indian missions abroad, shipping companies, and maritime authorities to monitor the condition of Indian crew members. Officials have assured that diplomatic and consular assistance for the crew.

The attack have once again highlighted the dangers faced by thousands of Indian seafarers employed on international cargo vessels operating in conflict-affected regions. The continuing war has disrupted shipping routes in the Black Sea, creating risks for commercial trade and the safety of multinational crews.

The latest diplomatic move reflects India’s consistent position on the Russia-Ukraine conflict. While maintaining relations with both countries, India has repeatedly called for dialogue, a peaceful resolution to the conflict, and the protection of civilians and commercial vessels under international law.

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India News

Barring emergency vehicles, Delhi-Haridwar highway to be shut for traffic from August 4 to 12 for Kanwar Yatra

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The Delhi-Haridwar highway will be closed for all vehicular traffic from August 4 to August 12 to ensure the smooth and safe conduct of the Kanwar Yatra.

The decision was jointly taken by Delhi Police, Uttar Pradesh Police and Uttarakhand Police after assessing security arrangements and traffic management plans.

The restrictions have been imposed as lakhs of Kanwariyas are expected to travel to collect water from the Ganga in Haridwar and other pilgrimage centres before returning to their hometowns.

Traffic restrictions on key stretches of the highway will impact most private and commercial vehicles. Emergency vehicles including ambulances, fire services and police vehicles will be allowed to operate. The authorities have issued diversion plans for vehicles moving from Delhi, Uttar Pradesh, Uttarakhand and adjoining states.  

The restrictions are necessary, officials said, because of the huge number of pilgrims. The objective is to ease traffic congestion, avoid accidents and ensure safe movement of devotees. 

Police have advised commuters to avoid the Delhi-Haridwar route during the restricted period and to use alternate highways wherever possible. According to the traffic advisory, transport operators have been asked to change their travel schedules. The route will have extra police, traffic wardens and surveillance teams to monitor the movement of vehicles and control the crowds.                               

The Kanwar Yatra is one of the biggest annual religious pilgrimages in North India that draws lakhs of devotees from Delhi, Uttar Pradesh, Haryana, Rajasthan, Punjab and other states. Every year, special traffic arrangements are made to manage the huge inflow of pilgrims travelling on foot and in designated vehicles.

Officials are busy making last minute preparations for the yatra, including security checks, medical camps, temporary shelters and help centres along the route. Commuters are advised to follow official traffic advice and plan journeys in advance to avoid delays. The restrictions will continue till August 12, after which normal movement of traffic is likely to resume on the Delhi–Haridwar highway.

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Dhanush’s call for public service fuels speculation on entry into politics

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Tamil actor Dhanush has sparked political rumours after urging his fan clubs to focus on public service and “find a purpose” beyond celebrating his films during a blood donation camp in Chennai.

While his remarks triggered widespread discussion online, the actor hasn’t formally announced his political entry.

Addressing members of his fan associations, Dhanush encouraged them to channel their collective strength towards welfare initiatives that could positively impact society. He urged his supporters to identify the needs of people in their local communities and extend help wherever possible, saying he wanted his fans to be known for their service rather than just their support for his films.

The speech quickly gained attention on social media, with several users drawing comparisons between Dhanush and actor-politician Vijay, whose fan clubs had similarly expanded their welfare activities before he formally entered politics. Many online users interpreted Dhanush’s emphasis on organised social work as a possible indication of future political ambitions.

Dhanush did not make any reference to joining politics or launching a political outfit during his address. His speech remained focused on encouraging fans to undertake blood donation drives, charitable work and other community welfare initiatives.

The actor’s fan clubs have long been involved in social service activities, including relief work, blood donation camps and assistance during natural disasters. His latest remarks have, however, brought back online discussions over whether he could eventually follow the path taken by Vijay and several other Tamil cinema personalities who entered public life.

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