05. Drainage
Explanation:
Natural flow The interruption of a river’s natural flow by dams, interbasin transfers or water withdrawal - is an indicator of the degree to which rivers have been modified by man. The construction of large dams - defined as those with walls at least 15 metres high - has increased significantly over the past 50 years. Damming and flood control can have negative impacts, such as declining fish catches, loss of freshwater biodiversity, etc.