Question

name the oldest water harvesting system channeling the flood water of river ganga

Answer 1

In the first century B.C. the oldest water harvesting was found in Sringaverapura near allahabad to channel Ganga

Answer 2

Sringaverapura water harvesting system, that is located near Allahabad, is the oldest one that channels the flood water of Ganga river.

In first century BC, the system was constructed to conserve water. Here, the water percolates, filtered, stored in tanks and then finally drain the excess water back to the Ganga river.