Corning Gorilla Glass TougherTogether. ET India Inc. ET Engage. ET Secure IT. Web Stories. Morning Brief Podcast. Economy Agriculture. Foreign Trade. Company Corporate Trends. Defence National International Industry. International UAE. Saudi Arabia. There are at least a thousand dams on the Ganga basin obstructing the flows of its various tributaries and adversely affecting the overall health of the river system, according to a recent assessment by researchers and experts from multiple organisations.
The main reason for declining flows in our rivers is these dams, according to our assessment. Experts gathered at the Rivers Week proceedings in New Delhi said it was time that the Namami Gange Program of the Centre define the environmental flows e-flow is a regime of flow in a river that mimics the natural pattern; tt refers to the quality, quantity and timing of water flows required to maintain the components, functions, processes and resilience of aquatic ecosystems that provide goods and services to people for all tributaries in the Ganga basin.
But diversions where water is withdrawn for other purposes like irrigation, flow is impacted. Some dams like the Tehri dam in Uttarakhand have helped maintain a flow in the lean season.
These environmental flow e-flow norms stipulate the volume of water that dams and barrages must release to allow the river to naturally clean itself and protect its aquatic biodiversity.
The e-flow norms were notified in September by the National Mission for Clean Ganga NMCG , the apex body responsible for the cleaning and rejuvenation of the river, and are to be enforced from December 15, While all the barrages have started following them, owners of three dams have said they cannot increase the flow from their reservoirs, as required by the notification, because it would reduce their power generation capacity and lead to huge financial losses.
Two of the dams are owned by private companies while one is under the Uttarakhand government. The Ganga has six dams and four barrages along its run in the country. In the upper Ganga basin Tehri Garhwal to Haridwar in Uttarakhand , where all the dams are located, the notification prescribes three norms: The outflow should be 30 per cent of the monthly average inflow from June to September, which is the high flow season; 25 per cent in October, April and May; and 20 per cent from November to March, which is the lean period.
For the middle Ganga basin Haridwar to Kanpur in Uttar Pradesh , where all the barrages are located, the e-flow is different for each project. Leading the rebellion is Alaknanda Hydro Power Company Ltd AHPCL , which operates the Srinagar dam in Pauri Garhwal, and produces megawatt of electricity that it supplies to Uttar Pradesh 88 per cent and Uttarakhand 12 per cent, free of cost as a royalty for being located in the state.
India has more than 91 major reservoirs including all artificial lakes with large capacity, Indirasagar Dam reservoirs is the largest reservoir in India followed by Nagarjuna Sagar. The dam was constructed during the reign of the Egyptian Pharaoh Sethi between BC, and was expanded during the Roman period and between and There are two major dams on the Ganga.
One at Haridwar diverts much of the Himalayan snowmelt into the Upper Ganges Canal, built by the British in to irrigate the surrounding land. The other dam is a hydroelectric affair at Farakka, close to the point where the main flow of the river enters Bangladesh.
0コメント