USGS Groundwater Information
Groundwater Resources Program
New & Noteworthy
Technical Announcement: USGS Issues Revised Framework for Hydrogeology of Floridan Aquifer
Press Release: High Plains Aquifer Groundwater Levels Continue to Decline
USGS Groundwater Watch
USGS maintains a network of active wells to provide basic statistics about groundwater levels.
Other Water Topics
USGS in Your State
USGS Water Science Centers are located in each state.
Groundwater Age Dating & Recharge
GWRP supports applied research into the use of groundwater age information to improve our understanding of recharge in Principal Aquifers.
Purpose & Scope
Groundwater recharge is often difficult to quantify because of its spatial and temporal variability and because of the challenges of measuring it directly. However, recharge estimates are an important component of water budgets developed to accurately assess groundwater availability. GWRP supports efforts to evaluate the use of groundwater age data to improve our overall understanding of recharge and thereby improve groundwater availability studies through the following activities:
Through this work, the USGS will:
Methods & Activities
This project will focus on synthesis of existing data and collection of new data for two general categories of recharge:
This project began in early 2008 and will run through late 2009.
Synthesis of Existing Data
Collection of New Data
Groundwater samples will be collected and analyzed to fill important data gaps in existing groundwater availability studies and to demonstrate age-dating techniques that could be used in future studies to understand recharge conditions.
McMahon, P.B., Plummer, L.N., Bohlke, J.K., Shapiro, S.D., and Hinkle, S.R., 2011, A comparison of recharge rates in aquifers of the United States based on groundwater-age data: Hydrogeology Journal, DOI 10.1007/s10040-011-0722-5
For more information:
For more information about this project, contact: