Solution:
The three different rainwater harvesting systems practised in India are Tankas, Guls and kuls and Khadins.1) Tankas: In the dry regions of Rajasthan, like Bikaner, Phalodi, and Barmer, almost all the houses have installed tankas for storing rainwater. The tanks were built on the house's top or in the courtyard. The tankas were connected to the sloping roofs of the homes through a pipe. Then the water falling on the rooftops would travel down the pipe and can be stored in these 'tankas.'
2) Guls & Kuls: In hilly and mountainous regions of India like Himachal Pradesh and Uttarakhand, people built diversion channels like the 'guls' or 'kuls' of the Western Himalayas for agriculture to store rainwater.
3) Khadins: The 'Khadi' rainwater harvesting system is practised in Rajasthan. In khadin, a long earthen dam is known as the bund. It is made across the edges of the field. Then the rainwater flows down the slope and gets collected. The water collected on the land can be used for agriculture.
