Provisions of the Act

A dam is a structure that is built on rivers, streams, or estuaries for conserving water. It directly helps to supply people with adequate water for consumption, industrial and irrigation purposes.

• As a result of dam construction and holding of sediments in reservoirs, sediment feeding of downstream channel or shore beaches is prevented. Corrosions may occur. As the transfer of sediments is avoided by this way, the egg lying zone of the fishes living in the stream ecosystem is restricted, too.
• Reproduction of migrating fishes is hindered by the floods that harm the egg beds. Or the egg gravel beds can be destructed while the excavation and coating works in the stream beds.
• Temperature of water, salt and oxygen distribution may change vertically as a consequence of reservoir formation. This may cause the generation of new living species.
• Normal passing ways of territorial animals are hindered since the dam works as a barrier. Meantime the upstream fish movement aiming ovulation and feeding is prevented and thus fish population decreases significantly
• There will be serious changes in the water quality as a result of drainage water returning from irrigation that was done based on the irrigation projects. In other words, over transfer of food and the increase in salt density can raise water lichens and may change water living species.
• Discharge of toxic matters (pesticides, toxic metals etc.) and their condensation in food chain may affect sensitive animals immediately; all living organisms may expire when the stream becomes unable to recover itself.
• The water regime may change as a result of destruction of nature, unexpected floods may occur and consequently vegetation and natural structures in the riverbanks can be damaged.
• Some increase in earthquakes may occur because of filling of big dam reservoirs.
• Rise in evaporation loses may be expected as a result of the increase in the water surface area.
• Microclimatic and even some regional climate changes may be observed related to the changes in air moisture percentage, air temperature, air movements in big scale and the changes in the region topography caused by the stagnant, big scaled mass of water.
• Water-soil-nutrient relations, which come into existence downstream related to the floods occurring from time to time in a long period of time, change. Depending on this fact, compulsory changes come into existence in the agricultural habits of the people living in this region and also in the flora and fauna.
• Dams may cause increases in water sourced illnesses like typhus, typhoid fever, malaria and cholera.
• Dams affect the social, cultural and economic structure of the region considerably. Especially forcing people, whose settlement areas and lands remain under water to migrate, affect their psychology negatively.

Dams usually play a role in mitigating the impacts of regular floods. At the same time they introduce a catastrophic hazard of even greater flooding in the event of dam failure.

Dam failure has multiple instigating factors, both man-made (bad design, ineffective monitoring, bad operations & maintenance (O&M) etc.) and natural (heavy rains, landslides etc.). Therefore, knowing how existing and proposed dams can fail, and the consequences of their failure is crucial for mitigating disaster risk created by their construction. Most recently heavy floods reportedly damaged the barrages of the Rishiganga hydropower dam, which exacerbated the flood and led to significant human casualties and property damage.

As a large amount of water may be stored in a dam’s reservoir, its failure can cause large scale damage to life and property. Hence government has enacted Dam Safety Act.

• Jurisdiction of Parliament to frame a law on intra-state river dams

The Bill applies to all specified dams in the country.  These are dams with: (i) height more than 15 metres, or (ii) height between 10 to 15 metres, subject to certain design and structural conditions.  This includes dams on both inter and intra-state rivers. The Act has raised the issue whether Parliament has the jurisdiction to frame a law on intra-state dams.

Water is under the state list (Entry 17), but the Centre has brought the legislation under Article 246 of the Constitution. (Article 246 empowers Parliament to legislate on any matter enumerated in List I of the Union List in the Seventh Schedule of the Constitution.)

As per Entry 17 of the State List, states can make laws on water supply, irrigation and canals, drainage and embankments, water storage and water power, subject to Entry 56 of the Union List.  Entry 56 of the Union List allows Parliament to make laws on the regulation of inter-state rivers and river valleys if it declares such regulation to be expedient in public interest.  The Bill declares it expedient in public interest for the Union to regulate on a uniform dam safety procedure for all specified dams.  

According to the Ministry, the Parliament enacted the act within the constitutional framework. It was not violative of Articles 246(3), 14, 19 and 21 and the basic feature of the Constitutionas

The Act has stipulated guidelines for the safety of the specified dams in the country. It is not restricted to a particular river, project or a dam.

• Functions of authorities may be changed through notification

The other issue is related to the authorities formed under the Act. The functions of the National Committee on Dam Safety, the National Dam Safety Authority, and the State Committee on Dam Safety are provided in Schedules to the Bill.  Their functions include: (i) resolving issues between State Dam Safety Organisations (SDSOs), or between a SDSO and a dam owner, (ii) assessing potential impact of dam failure and coordinating mitigation measures with affected states, and (iii) supervising dam rehabilitation programmes.  These Schedules can be amended through notification.  This implies that the core functions of these bodies can be changed by the government through notification without prior amendment of the Act by Parliament.  

The states have also raised objection, mainly Tamil Nadu. They allege it contains clauses which violate the rights of the state, especially with respect to the dams constructed by it in neighbouring states, and will cause problems in maintenance and operation. The main concern of the state is about retaining its power in controlling the dams, autonomy, and ownership of the assets.

However, the passage of this Bill heralds a new era of dam safety and water resources management in India.