Zobrazenie zdroja stránky Groundwater flow system

:Slovak term: [[Slovenský termín]]
# A groundwater flow system is a discrete, closed three-dimensional system containing flow paths from the point at which recharging water enters an aquifer to the topographically lower point at which it leaves the aquifer (WHO 2006).
# A Ground Water Flow System is the movement of ground water that is under ground and flows along flow paths from areas of recharge to areas of discharge (World Plumbing Council Working Group 2008).

==Explanation==
In many aquifers, the hydraulic head reflects the topographic surface of the ground, and
groundwater therefore moves from elevated regions where recharge occurs to discharge
zones at lower elevations. Thus within the context of the overall cycle and the
source-pathway-receptor concept, the groundwater flow system is a useful way of
describing the physical occurrence, movement and hydrochemical evolution of
groundwater (WHO 2006).

A ground water flow is the movement of ground water which normally occurs as slow
seepage through the pore spaces of earth materials, or through fractures and openings in
consolidated rocks. The movement of water is generated from a natural pressure zone to a
discharge point. The discharge points include natural springs, lakes, wetlands or oceans.
Discharge also occurs at bore pump wells where the water is pumped from the ground
(World Plumbing Council Working Group 2008).

==Example==
A Ground Water Flow System replenishes the water in a pump bore hole at a rate which
determines the amount of water that can be pumped at any one time.

If the groundwater flow system is not at a velocity high enough to enable the pumped
volume of water to flow to the bore pump then the pump will fail.

If the total water extraction from the ground water source is greater than the total natural
ground water recharge then the total ground water system will fail (World Plumbing
Council Working Group 2008).

==References==
* WHO (2006) [http://www.who.int/water_sanitation_health/publications/protecting_groundwater/en/index.html Protecting groundwater for health].

==Links==
* [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]

[[Category:EN]][[Category:WaterEN]]