Soil and vadose zone profiles are used as an archive of changes in groundwater recharge and water quality following changes in land use in an area of the Loess Plateau of China. A typical rain-fed loess-terrace agriculture region in Hequan, Guyuan, is taken as an example, and multiple tracers (chloride mass balance, stable isotopes, tritium and water chemistry) are used to examine groundwater r...

Interest in artificial recharge of groundwater using pretreated wastewater continues to increase, especially in semi-arid countries. After the artificial recharge and natural treatment, the water could be extracted through boreholes pumping for direct irrigation. The selection of suitable locations for artificial recharge should be based on hydrogeological conditions, economic evaluation and en...

Acknowledgements This project was jointly funded by South Carolina Department of Health and Environmental Control – Office of Ocean and Coastal Resource Management and the South Carolina Sea Grant Consortium. The toxicology portion of this project was funded by The Citadel Foundation. We would like to acknowledge the following individuals for their valuable assistance in this project. Sadie Dre...

The hydrology and geochemistry of groundwater in tropical island aquifers, such as Barbados, Guam and Puerto Rico, are significantly influenced by tropical climatic conditions. Recharge to these aquifers is the product of regional and local climate patterns that control rainfall. Oxygen isotopes can be used to estimate the amount and timing of recharge on these islands because seasonal fluctuat...

The latest research on stormwater practices and their construction indicates that innovative construction methods can reduce soil compaction and enhance exfiltration from bioretention cells and permeable pavement. In this publication, we summarize the current research and describe construction methods that developers can use to more effectively meet the goals of low impact development and storm...

Urbanization of a watershed increases impervious area, and consequently increases stormwater runoff. When left uncontrolled, these increases in stormwater runoff cause downstream flooding, accelerate channel erosion, and impair aquatic habitat. Increases in the magnitude and duration of stormwater runoff that accompany uncontrolled development allow a stream to carry more sediment than it could...

With full development in an urban watershed and with no stormwater controls, it is unlikely that any of these uses can be obtained. With less development and with the application of stormwater controls, some uses may be possible. It is important that unreasonable expectations not be placed on urban waters, as the cost to obtain these uses may be prohibitive. With fullscale development and lack ...

Urban areas typically have a high degree of impervious surfaces— that is, roads, parking lots, rooftops, and other surfaces that impede the movement of water into the soil. In predevelopment areas with natural ground cover, over half of precipitation infiltrates the soil to replenish groundwater tables, and only a small amount (10%) remains as runoff into stormwater systems, rivers, and lakes. ...

Water resource shortage has been a serious problem since the 1980s in the North China Plain (NCP), resulting in plenty of environmental problems. Estimating the groundwater recharge rate accurately is vital for managing groundwater effectively. This study applied several methods, including chloride mass-balance, tracers (bromide and tritium) and numerical modeling (Hydrus-1D), to estimate groun...

A nationwide model of groundwater recharge for New Zealand (NGRM), as described in this paper, demonstrated the benefits of satellite data and global models to improve the spatial definition of recharge and the estimation of recharge uncertainty. NGRM was inspired by the global-scale WaterGAP model but with the key development of rainfall recharge calculation on scales relevant to nationaland c...