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Water Budget Equation

Water Budget Equation

Catchment area

  • The area of land draining in to a stream or a water course at a given location is called catchment area / drainage area / drainage basin / watershed.
  • A catchment area is separated from its neighboring areas by a ridge called divide.

A watershed is a geographical unit in which the hydrological cycle and its components can be analyzed. The equation is applied in the form of water-balance equation to a geographical region, in order to establish the basic hydrologic characteristics of the region. Usually a watershed is defined as the area that appears, on the basis of topography, to contribute all the water that passes through a given cross section of a stream.

Water Budget Equation

  • For a given catchment, in an interval of time ∆t, the continuity equation for water in its various phases can be given as:

            Mass inflow  –  Mass outflow =        Change in Mass Storage

WB Equation

WB Equation

  • If the density of the inflow, outflow and storage volumes are the same:

Vi – Inflow volume in to the catchment
Vo – Outflow volume from the catchment
∆S – change in the water volume

Water Budget

Water Budget Equation

If a permeable soil covers an impermeable substrate, the topographical division of watershed will not always correspond to the line that is effectively delimiting the groundwater.

About Mustafa

My name is Mustafa Awais, I am basically from Pakistan & Currently living in Saudia Arabia, I am Civil Engineer as well as Web Master.

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