The walls of such dams hinder fish migration. It totally or partially separates spawning habitats from rearing habitats. Additionally, these large dams tap various sediments that are essential for the survival of fishes and other aquatic creatures that live downstream.
Another significant impact of dams is that they transform a free-flowing ecosystem of a river or a stream to an artificial slack-water habitat. Sudden changes of temperature, oxygen level, the chemical composition of the water, etc. often leave an adverse effect on various species.
Aquatic creatures that evolve in a particular ecosystem can face the threat of extinction because of this sudden change. Additionally, these reservoirs usually house different invasive and non-native species, which harms the typical ecosystem of a particular river. Thus, the demand for an alternative to big dams is only logical to save such ecosystems.
Apart from the ecosystem of rivers, these dams have a substantial environmental impact on lives around particular rivers. The changes in a river’s flow along with sediment transportation alters the overall ecosystem surrounding that river.
Over time, the demand for alternatives to big dams has also increased as its adverse effects have come forward.
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1. What is the largest dam in India?
Ans. Tehri Dam in Uttarakhand is the largest dam in India. It has a height of 260 meters and length of 575 meters. Moreover, it can generate up to 1000 MW of hydropower.
2. Which is the oldest dam in the world?
Ans. Jawa dam in Jordan is the oldest dam in the world. It dates back to 3,000 BC. The remains of this dam are still there, 100 km from the capital Amman.
3. What is the alternative to big dams?
Ans. The alternatives to big dams are water conservation and recycling water. Proper utilisation of these methods can offer better solution than that of conventional dams.
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