during lockdown , what are good effect seen on Ganga and Yamuna river.
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It’s a rare sight in Varanasi. The Ganga is shimmering and is so transparent that one can see its aquatic life, such as fish and tortoise, deep in the water. It's all thanks to the nationwide lockdown to curb Covid-19 and the cessation of polluting activities.
The Ganga Ghat in Varanasi is deserted due to the nationwide lockdown
“What could not be achieved in the last 34 years since the inception of Ganga Action Plan (GAP) in 1986, and the launch of Namami Gange in 2014, with hundreds of crores of rupees being pumped in, is visible in just 34-35 days of lockdown,” said Prof B D Tripathi, chairman of Mahamana Malaviya Research Centre for Ganga, River Development and Water Resource Management, Banaras Hindu University (BHU).
He acknowledged that more needed to be done. “While it is true that the quality of Ganga water has improved, but we can’t claim that the river is 100% free from pollution. In fact, just 25-30% reduction in pollution level is being noticed,” he said.
The impact of the lockdown on Ganga’s health is, nevertheless, encouraging and proves that by undertaking more measures water quality can be improved even further. Specifically, there has been significant improvement in the health indicators of Ganga’s water — an increase in dissolved oxygen (DO) and reduction in biochemical oxygen demand (BOD) — during the lockdown. BOD level indicates the amount of decaying organic matter in water, a low BOD indicating good quality. Low DO level signifies poor quality. If dissolved oxygen levels decline, aquatic life is impacted badly. Fecal coliform count (FCC), the primary indicator of potability, has also declined.
Times of india
Answer ⤵️⤵️It’s a rare sight in Varanasi. The Ganga is shimmering and is so transparent that one can see its aquatic life, such as fish and tortoise, deep in the water. It's all thanks to the nationwide lockdown to curb Covid-19 and the cessation of polluting activities.The Ganga Ghat in Varanasi is deserted due to the nationwide lockdownThe Ganga Ghat in Varanasi is deserted due to the nationwide lockdown“What could not be achieved in the last 34 years since the inception of Ganga Action Plan (GAP) in 1986, and the launch of Namami Gange in 2014, with hundreds of crores of rupees being pumped in, is visible in just 34-35 days of lockdown,” said Prof B D Tripathi, chairman of Mahamana Malaviya Research Centre for Ganga, River Development and Water Resource Management, Banaras Hindu University (BHU).He acknowledged that more needed to be done. “While it is true that the quality of Ganga water has improved, but we can’t claim that the river is 100% free from pollution. In fact, just 25-30% reduction in pollution level is being noticed,” he said.The impact of the lockdown on Ganga’s health is, nevertheless, encouraging and proves that by undertaking more measures water quality can be improved even further. Specifically, there has been significant improvement in the health indicators of Ganga’s water — an increase in dissolved oxygen (DO) and reduction in biochemical oxygen demand (BOD) — during the lockdown. BOD level indicates the amount of decaying organic matter in water, a low BOD indicating good quality. Low DO level signifies poor quality. If dissolved oxygen levels decline, aquatic life is impacted badly. Fecal coliform count (FCC), the primary indicator of potability, has also declined.#“We have seen remarkable improvement in Ganga water quality with dissolved oxygen level rising and biochemical oxygen demand levels decreasing during lockdown. Policy makers should revisit the planning for the cleaning of the Ganga cleaning taking a lesson from this,” Dr Tripathi said.“Only constructing sewage treatment plants (STPs) is not enough, an effective check on discharge of pollutants in any form into the river as well as increased flow of river water is equally important,” said Tripathi, who conducted composite sampling before the lockdown started on March 24 and then again on April 20 for testing.His team collected samples from five locations — Shooltankeshwar Ghat (upstream), Samne Ghat, Assi Ghat, Dashashwamedh Ghat and Rajghat (downstream). “On analysis, it was found that the dissolved oxygen level increased up to 25-30%, while biochemical oxygen demand level decreased up to 35-40%,” he said.#Tripathi said this was due to the closure of saree dyeing units, automobile workshops, hotels and restaurants, reduction in cremation, floating population and check on dumping solid wastes into the Ganga. Besides, the flow of river also increased due to closure of lift canals, he said.“The river itself has self-purifying capacity if sufficient water flow is maintained. We have seen this during the Prayagraj Kumbh mela,” he added.Prof Vishwambhar Nath Mishra, a professor at IIT (BHU) and president of the Sankat Mochan Foundation (SMF), said, “Though the Ganga water’s dissolved oxygen level has improved significantly during lockdown, the fecal coliform count hasn't.” SMF also regularly monitors the water quality of Ganga and collected samples on March 6 and April 4.
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