Groundwater discharge

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Groundwater discharge is the volumetric flow rate of groundwater through an aquifer.

1 Groundwater discharge, Q
- 1.1 Conservation principle
2 See also
3 References

[edit] Groundwater discharge, Q

Total groundwater discharge, as reported through a specified area, is similarly expressed as:

$Q = \frac{dh}{dl}KA$

where

Q is the total groundwater discharge ([L³T⁻¹]; m³/s), and

A is the area which the groundwater is flowing through ([L²]; m²)

For example, this can be used to determine the flow rate of water flowing along a plane with known geometry.

[edit] Conservation principle

The conservation principle shows that the mass or volume water flowing into a system is equal to that flowing out, with storage holding or releasing water in the system. Mathematically, this simple concept can be expressed as:

$Q_{\mathrm{in}}-Q_{\mathrm{out}}=\frac{\Delta S}{\Delta t}$

where

Q in

and

Q out

are the volumetric flow rates in and out the system (such as wells, rivers, etc.),

Δ S

is the change of water volume that enters/leaves the system, and

Δ t

is the change of time

If the system is steady state, then the right-hand side of the equation is 0.

[edit] See also

[edit] References

Freeze, R.A. & Cherry, J.A., 1979. Groundwater, Prentice-Hall. ISBN 0-13-365312-9

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