A river of Rajasthan that had dried up but was revived by villagers with the help of the NGO Tarun Bharat Sangh is the:

The Arvari river in the Alwar district of Rajasthan had dried up because of deforestation and over-use of groundwater. It was revived in the 1980s and 1990s by local villagers with the help of the NGO Tarun Bharat Sangh, led by Rajendra Singh.

How the river was revived:

• From 1985 onwards, Tarun Bharat Sangh encouraged villagers to build johads, traditional earthen check dams, to collect and store rainwater.
• Hundreds of johads and other small structures were built in the catchment of the Arvari.
• The stored rainwater seeped into the ground and recharged the groundwater.
• Gradually, wells filled up again, springs revived, and by around 1995, the Arvari began flowing throughout the year.

Arvari River Parliament:

• The villagers set up the Arvari Sansad (Arvari River Parliament), a community body of representatives from villages along the river.
• It makes rules for the fair and sustainable use of the river's water, such as limits on water-intensive crops, and bans on selling water and on hunting.

Rajendra Singh:

• He is known as the "Waterman of India".
• He received the Ramon Magsaysay Award in 2001 for community leadership.
• He won the Stockholm Water Prize in 2015, often called the "Nobel Prize for water".
• Through his work, several other dry rivers of Rajasthan, such as the Ruparel, Sarsa, Bhagani and Jahajwali, were also revived.

Importance:

The Arvari revival is a well-known example of community-based water management and traditional water harvesting in India.

Why not the other options?

• ✗The Luni, Banas and Sahibi are other rivers of Rajasthan; their story is not linked to this campaign.