Explanation:

- Johad: A traditional rainwater storage technique used largely in Rajasthan, India, johads are earthen embankments that collect and store rainwater, helping recharge the groundwater.

- Haryali: This isn't a traditional water storage structure. In India, "Haryali" translates to greenery or lushness and is often associated with afforestation or initiatives promoting environmental improvement but not specifically water storage.

- Kund: These are small, underground water storage tanks found in western India, particularly in arid regions, used to collect and store rainwater for drinking purposes.

- Tanka: A traditional rainwater harvesting structure from Rajasthan, tankas are underground tanks meant to store water for different uses, especially during dry periods.

Correct Answer: Option 2, Haryali