What do you understand by water harvesting? Mention any one instance that show that water harvesting existed during ancient India.

What do you understand by water harvesting? Mention any one instance that show that water harvesting existed during ancient India. (GS 3)

आप जल संचयन से क्या समझते हैं? कोई एक उदाहरण दें जिससे पता चले कि जल संचयन का अस्तित्व प्राचीन भारत के दौरान था।