The term yield is used to describe the volume of water escaping from a

spring Spring(s) may refer to: Common uses * Spring (season), a season of the year * Spring (device), a mechanical device that stores energy * Spring (hydrology), a natural source of water * Spring (mathematics), a geometric surface in the shape of a h ...

over a certain period of time, the

discharge Discharge may refer to Expel or let go * Discharge, the act of firing a gun * Discharge, or termination of employment, the end of an employee's duration with an employer * Military discharge, the release of a member of the armed forces from ser ...

quantity of which is measured in /sMurawski & Meyer (2010), p. 133. Keywords ''Quelle'', ''Quellschüttung''. Measurement methods include volume–filling-time measurement and

water level Water level, also known as gauge height or stage, is the elevation of the free surface of a sea, stream, lake or reservoir relative to a specified vertical datum.ISO 772: 1996. Hydrometric determinations – Vocabulary and symbols. See also * ...

measurement. The discharge of a spring can fluctuate to a greater or lesser extent depending on precipitation and evaporation.

Karst spring A karst spring or karstic spring is a spring (outflow of groundwater) that is part of a karst hydrological system. Description Because of their often conical or inverted bowl shape, karst springs are also known in German-speaking lands as a ''To ...

s show particularly large time-dependent differences in the discharge.

References

Bibliography

Murawski, Hans and Wilhelm Meyer (2010). ''Geologisches Wörterbuch''. 12th edn. Heidelberg: Spectrum. Limnology Hydrogeology {{hydrology-stub