Spring (hydrology)

For other uses, see Spring (disambiguation).

On an average day nearly 303 million US gallons (1,150,000 m3) of water flow from Big Spring in Missouri at a rate of 469 cubic feet per second (13.3 m3/s).
Grand Prismatic Spring, Yellowstone National Park, Wyoming

A spring is a natural exit point at which groundwater emerges from the aquifer and flows onto the top of the Earth's crust (pedosphere) to become surface water. It is a component of the hydrosphere, as well as a part of the water cycle. Springs have long been important for humans as a source of fresh water, especially in arid regions which have relatively little annual rainfall.

Springs are driven out onto the surface by various natural forces, such as gravity and hydrostatic pressure. A spring produced by the emergence of geothermally heated groundwater is known as a hot spring. The yield of spring water varies widely from a volumetric flow rate of nearly zero to more than 14,000 litres per second (490 cu ft/s) for the biggest springs.[1]

  1. ^ "Te Waikoropupū Springs". New Zealand Department of Conservation. Retrieved 6 February 2022.