Raichur district in Karnataka became highly endemic for malaria after the construction of the Tungabhadra dam and its canal network. Your email address will not be published. Certain species of fish must travel upstream to breed. This can destroy the upstream ecology and cause damage to property. Renewable energy—wind, solar, geothermal, hydroelectric, and biomass—provides substantial benefits for our climate, our health, and our economy. Get Ready for Power Bowls, Ancient Grains and More. All mega projects, whether water related or not, have financial and other risks. However, though the benefits of the anticipated increases in agricultural productivity are taken as a benefit of dams, the resultant costs of pesticides and fertilizers on the environment are very rarely computed or even studied. For most recent projects, the environmental clearance conditions include treatment of the catchment area. Most adverse social and environmental impacts of dams were, till recently, ignored. Besides, wild animals are rightly wary of leaving their own territory and panic when waters flood in. A further aspect of the greenwash is the argument that hydropower is the lesser of two evils. Unfortunately, the first is a curative rather than a preventive measure.
Needless to say, it’s hard to argue dams benefit the environment.
Consequently, even where treated, the catchments rapidly deteriorate.
Hydroelectric plants in flat areas tend to require much … Similar fears are being widely expressed about the Tehri dam. Sounds nice in theory, but what evidence is he premising his take on?
Therefore, they restrict the water flow of rivers, which also limits the flow of sediment naturally present in the river, leading to erosion of coasts and beaches. Large dams are catapulting a range of species toward extinction.
The mega dams in the Americas, Asia, Europe and Africa are clear evidences of such benefits, although most of these dams might, or might not, satisfy the internationally recognised standards of construction, operation and environmental protection.
Mega dams certainly come with their financial and safety risks and changes to hydrological flow of water. In the Sirhind feeder canal command area, there was a “menacing increase in mosquitoes”. Highway Drainage Design, Structures and Guidelines. Thank you! When compared with the other alternatives of energy projects, in particular nuclear power projects, however, mega dams not only provide renewable energy but also come with comparatively less, preventable and manageable risks for generations to come. For some time pro-irrigators have been spouting the line ‘dams are good for the environment’, often with no or poor evidence and explanation. Even where studies were conducted, there was a tendency to consider only large mammals as ‘wildlife’.
Changing the current has an immediate impact on the ecosystem in the river.
Reservoirs also submerge productive agricultural land in the valley.
The Rift is presenting a historical debate revolving around France’s colonial past. So why, despite the preponderance of evidence that large hydro is bad for the environment is it maintaining its green luster? 17 of the 75 cases of RIS reported worldwide have been reported from India. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Mosquitoes, which are carriers of malaria, filaria, dengue and other diseases breed in small pools of water created on the edges of the reservoir due to the lowering and raising of the water level of the reservoir.
However, subject to the safety and legal requirements, the benefit of mega dams outweigh their disadvantages: First, mega dams bring tremendous socio-economic growth for countries and their populations.
Besides, the application of chemical pesticides results in other health hazards, which also need to be assessed and tackled. Different locations in the world have varying supply of natural water in different seasons. In other cases, reduced flows can lead to the erosion of estuaries and coasts. Post-construction effects can also have a negative impact on coastal and marine ecosystems, especially as the depletion of nutrients result in an insufficiency of food for various marine species. According to data published last year by Bent Flyvbjerg, one of the authors of the Oxford study, compared to other energy technologies, only nuclear power has a worse record for cost and schedule overruns than dams; solar and wind projects are at the top of the list. Environmental impacts of dams can be both adverse and beneficial.
According to a presentation made by the MoEF to the Prime Minister of India, if the Tehri dam burst, in less than an hour and a half, the water would hit Rishikesh and Haridwar and wipe out these two cities. Stay informed - subscribe to our newsletter. The major activity under CAT ought to be extensive plantation and regeneration of vegetative cover. By interfering with river flows, dams adversely affect downstream flora and fauna.
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