What is meant by base flow?

Base flow is a portion of the stream flow that is not runoff; it is water from the ground, flowing into the channel over a long time and with a certain delay.

What is base flow separation?

Baseflow separation is often used to determine what portion of a streamflow hydrograph occurs from baseflow, and what portion occurs from overland flow. Common methods include using isotope tracing and the software program HYSEP, among others.

What are the methods of base flow separation?

Currently, abundant methods for baseflow separation are available, of them, the graphical method, hydrological simulation method, tracer-based method, conductivity mass-balance (CMB) method, and automatic method are commonly used [8] (Table 1).

What are the components of runoff?

COMPONENTS OF RUNOFF:

Direct rainfall over the stream:-
Surface runoff or overland flow: –
Subsurface flow or interflow:–
Base flow, groundwater flow or Dry weather flow:-

What’s the difference between groundwater flow and Baseflow?

Below the water table, groundwater can discharge directly into a river, and this is called baseflow (Figure 3 ). In contrast, for rivers with a catchment of permeable rocks there may be no water from overland flow in the rivers. All of the river flow in this case will be baseflow.

What does a high base flow index mean?

Base Flow Index The BFI may be thought of as a measure of the proportion of the river runoff that derives from stored sources; the more permeable the rock, superficial deposits and soils in a catchment, the higher the baseflow and the more sustained the river’s flow during periods of dry weather.