Direct runoff is made up of
Direct runoff is that part of runoff which enters the stream immediately after the precipitation. It includes surface runoff, prompt interflow and precipitation on the channel surface.
A hydrograph is a plot of
The term base flow denotes
The delayed flow that reaches a stream essentially as groundwater flow is called base flow.
Virgin flow is
A stream flow unaffected by works of man, such as structures for storage and diversion on a stream is called virgin flow.
An ephemeral stream
An intermittent stream
An intermittent stream has limited contribution from the groundwater. During the wet season the water table is above the stream bed and there is a contribution of the base flow to the stream flow.
The flow-duration curve is a plot of
A flow-duration curve of a stream is a plot of discharge against the per cent of time the flow was equalled or exceeded. This curve is also known as discharge frequency curve.
In a flow-mass curve study the demand line drawn from a ridge in the curve did not interest the mass curve again. This represents that
If in a flow-mass curve, a demand line drawn tangent to the lowest point in a valley of the cure does not intersect the mass curve at an earlier time period, it represents that
The flow-mass curve is an integral curve of
The flow mass curve is a plot of the cumulative discharge volume against time plotted in chronological order. The ordinate of the mass curve, V at any time t is,
Since the hydrograph is a plot of Q vs t, it is easy that the flow mass curve is an integral curve of the hydrograph.