A
The artificial channel created to connect two major international river basins.
B
The volume of water diverted exclusively for transboundary industrial irrigation.
C
The maximum seasonal flood discharge recorded during the monsoon period.
D
The minimum quantity of water required to maintain aquatic ecosystems and river health.
Correct answer: (d) The minimum quantity of water required to maintain aquatic ecosystems and river health.
Explanation
Option D is correct because ecological flow is defined as the minimum quantity of water required to maintain aquatic ecosystems and river health. Options A, B, and D misrepresent the ecological definition of the term.