Q. Which one of the following ancient towns is well-known for its elaborate system of water harvesting and management by building a series of dams and channelizing water into connected reservoirs?

[A] Dholavira

[B] Kalibangan

[C] Rakhigarhi

[D] Ropar

Answer: D
Notes:

Why this Question) Recently Dholavira along with Ramappa temple (Telengana) was declared as World Heritage Site by UNESCO. 

Ans) a 

Exp) Option a is correct. 

The ancient city of Dholavira is one of the most remarkable and well-preserved urban settlements in South Asia dating from the 3rd to mid-2nd millennium BCE (Before Common Era).  Discovered in 1968, the site is set apart by its unique characteristics, such as its water management system, multi-layered defensive mechanisms, extensive use of stone in construction and special burial structures. It has a complex system forcollecting and storing rain waterwithin several reservoirs. Planners in the ancient city of Dholavira had conceptualised an amazing system of drains, dams and tanks to manage water.  

Source) https://timesofindia.indiatimes.com/india/harappan-era-city-dholavira-inscribed-on-unesco-world-heritage-list/articleshow/84789197.cms 

https://www.downtoearth.org.in/indepth/secrets-of-the-water-fort-31932 

https://portfolio.cept.ac.in/archive/dholavira-decoding-its-water-heritage/ 

Subject) History