USGS Selected Ground-Water Issues
http://water.usgs.gov/ogw/issues.html

USGS

This USGS site addresses groundwater issues and management topics such as artificial recharge, freshwater-saltwater interactions, groundwater-surface water interactions, karst, land subsidence and the unsaturated zone. Resources include papers, circulars, fact sheets, links, references, photos and other information related to these topics.

Subject: Geoscience:Hydrology:Ground Water:Water cycle/groundwater-surface water interface, Unsaturated zone/recharge, Water supply/water resource evaluation, Water and society, policy, and management
Resource Type: Scientific Resources:Collection
Theme: Teach the Earth:Course Topics:Hydrology/Hydrogeology, Teach the Earth:Teaching Topics:Water