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During the hotter summers, however, there might be increased ET in particular if the groundwater table is close to the land surface.

Artificial recharge with excess surface water or reclaimed wastewater is increasing in many areas, thus becoming a more important component of the hydrologic cycle.In semiarid regions, the recharge is irregular and occurs only in the periods of heavy rainfall.In humid regions, recharge is mainly in the winter period.The research and services that are offered at the Dissolved and Noble Gas Service Center are based upon the usage of noble gases and their solubilites to infer the conditions and time at wich precipitation and surface water runoff entered the groundwater system.We also employ anthropogenic chemicals as tracers to determine groundwater recharge ages.in a region depends mainly on the precipitation change during the major recharge season.In temperate climates, an increase in precipitation is generally foreseen during the winter season where most recharge occurs.Dissolution of carbonate rocks (karstic media) might become more vigorous by time and, accordingly, the hardness of groundwater sources is expected to increase, leading to possibly unacceptable water quality.As a result of climate change, in many aquifers of the world the spring recharge retreats toward winter with more or less the same rates, but summer recharge declines dramatically.In general, the importance of diffuse recharge decreases as the aridity of a region increases.Typically, most water from precipitation that infiltrates does not become recharge.


  1. While the age uncertainty using 4 He is much greater than with CFCs, 3 H/ 3 He, or 85 Kr, the potential for dating waters in the range of 50 to 1000 where no other dating methods are practical makes the use of radiogenic 4 He attractive.

  2. This study involved age dating of five springs and seven groundwater wells to assess how long it takes for nutrient-enriched groundwater to travel from farms to springs and streams, and to the lakes. Most of these groundwaters are relatively old, 8

  3. These data, combined with those from groundwater age-dating analyses, yielded dissolved methane concentrations from water wells at 239 locations in New York from 1999 to 2011 fig. 3.

  4. The groundwater age is defined as the time elapsed since the water entered the saturated zone and was isolated through additional recharge. The age actually applies to the date of introduction of the chemical substance and not the age of

  5. Tritium/ 3 He dating. 1. General background. Tritium 3 H or T is the radioactive isotope of hydrogen that decays with a half life of 12.43 years to its stable daughter 3 He.

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