Explanation: Rajasthan, a state in northwestern India, is known for its arid and semi-arid climate, which results in low rainfall and significant water scarcity. Rainwater harvesting is a crucial technique used in this region to collect and store rainwater for various purposes, with the primary focus being on providing drinking water.
Rainwater harvesting involves the collection of rainwater from rooftops and other surfaces, which is then stored in tanks or underground reservoirs. This method is particularly important in Rajasthan due to the state's limited water resources and the high demand for water, especially for drinking purposes. The collected rainwater is often treated and used as a supplementary source of drinking water, helping to alleviate the pressure on existing water supplies.
The practice of rainwater harvesting in Rajasthan is not only a response to water scarcity but also a sustainable water management strategy. It helps in recharging groundwater levels, reducing the burden on existing water sources, and providing a reliable source of water during dry periods. The collected water can also be used for other domestic purposes, such as washing and cleaning, but the primary focus remains on ensuring a supply of clean drinking water.
While rainwater harvesting can have additional benefits, such as cooling the house or cleaning the rooftop, these are not the primary reasons for its practice in Rajasthan. The main objective is to address the critical issue of water scarcity and provide a sustainable source of drinking water for the population.
In conclusion, the correct answer is (C) To store drinking water, as this is the primary reason for the widespread practice of rooftop rainwater harvesting in Rajasthan. This method is essential for ensuring a reliable supply of clean drinking water in a region where water resources are limited and the demand is high.