Correct Answer - Option 4 : Stream flow
Explanation
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Baseflow is a portion of streamflow that is not directly generated from the excess rainfall during a storm event.
- In other words, this is the flow that would exist in the stream without the contribution of direct runoff from the rainfall.
- Estimation of baseflow and direct runoff is useful to understand the hydrology of a watershed, including interaction of surface and sub-surface water, role of urbanization on runoff generation and the health of aquatic habitat within a stream.
Methods of Baseflow separation:
Mainly following three methods are used for baseflow separation
- Straight Line Method
- Fixed Base Method
- Variable Slope Method