The question asks to identify the project built for both hydel power production and irrigation purposes located in the Sutlej river basin.
The Bhakra Nangal project is a significant multi-purpose river valley project. It involves two dams: the Bhakra Dam and the Nangal Dam, constructed across the Sutlej River in the northern part of India.
The other options are associated with different rivers or primary functions:
Therefore, the Bhakra Nangal project is the correct answer as it meets all the criteria: hydel power production, irrigation, and location in the Sutlej river basin.
Which of the following dams is a part of the Damodar Valley Corporation?