Groundwater Discharge

Also found in: Wikipedia.

groundwater discharge

[′grau̇nd‚wȯd·ər ′dis‚chärj]
Water released from the zone of saturation.
Release of such water. Also known as decrement; groundwater decrement; phreatic-water discharge.

Groundwater Discharge


a rise in the level of groundwater caused by an increase in the water table in rivers during construction of reservoirs, river dams, navigation canals, and other hydraulic-engineering structures. Groundwater discharge saturates soil by seepage of water through the bottom and banks of canals, by water loss from water-supply and sewage systems, or by silting of river channels; a natural cause may be a rise in sea level.

Groundwater discharge causes soils to become marshy and saline, lowers the productivity of meadows, fields, and forests, causes sanitation in the area to deteriorate, and destroys buildings. Land is classed as flooded by groundwater when the water table has risen to a level making the area unsuitable for use: 0.6–0.9 m for meadows, 0.8–1.4 m for plowed fields, 1.2–1.8 m for orchards, 1.5–2 m for small settlements, and 3–4 m for cities.

Drainage systems are built to protect land from groundwater discharge and may be horizontal or vertical drainage or combined drainage with machine pumping. The drains are located along the borders of the endangered land. In the USSR, drainage systems have been built to control groundwater discharge on agricultural lands in the Kostroma Lowland, flooded by the Gorky Reservoir, near the city of Mary (the Karakum Canal), in Moscow (the Pererva Dam), in Kazan and Dimitrovgrad (the reservoir of the V. I. Lenin Volga Hydroelectric Power Plant), and in Nikopol’ (the Kakhovka Reservoir).


Kostiakov, A. N. Osnovy melioratsii, 6th ed. Moscow, 1960.
Zashchita territorii ot zatopleniia i podtopleniia. Moscow, 1963.


References in periodicals archive ?
Now that the groundwater discharge springs have been located, they can be incorporated into designs to re-create cool pools that may encourage sea-run brook trout to return and expand habitat for other fish.
Fort Knox engages in ongoing water management activities including storm water control and the dewatering well groundwater discharge to reduce the additional volume created by an abnormal increase in rainfall.
Groundwater levels are higher than sea levels, and that drives the groundwater discharge to the ocean.
We now know the Blackwood is unique because it is fresher in summer due to groundwater discharge.
A better understanding of groundwater discharge rates is one of the components required to determine a water budget for Douglas Lake.
This provides an important condition for estimating groundwater discharge as shown later (see Discussion, Eqn 2).
Muscat: Three pilot projects on continuous hybrid cooling using geothermal solar heat sources, submarine groundwater discharge, and IATI Wastewater pilot project, will be developed over the next three years.
63 mm/year) is found to be greater than groundwater discharge (49 mm/year), thus, 37.
Toro has already identified a saline groundwater discharge zone in the Tertiary cover on the adjacent tenement EL27301 via a geophysical survey in 2010 (Figure 1).
The dominant water sources are precipitation and groundwater discharge from surrounding uplands.
It was based on the comparison of simulated and factual (measured) groundwater level in different parts of bog and it fluctuations; because the data of direct measurements of groundwater discharge into drains are scanty and the data about groundwater discharge into the lake is lacking.

Full browser ?