, the inflow
of a body of water
is the source of the water
in the body of water. It can also refer to the average volume
of incoming water in unit time
. It is contrasted with outflow
All bodies of water have multiple inflows, but often, one inflow may predominate and be the largest source of water. However, in many cases, no single inflow will predominate and there will be multiple primary inflows.
For a lake, the inflow may be a river or stream that literally flows into the lake. Inflow may also be also be, strictly speaking, not flows, but rather precipitation, like rain.