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USGS IN YOUR STATE

USGS Water Science Centers are located in each state.

Assessment of Ground-Water Flow near the Savannah River Site,Georgia and South Carolina

Progress and Significant Results, 2004—2005

• The previous model (Clarke and West, 1998) was updated to simulate ground-water flow under 2002 hydrologic conditions and for four hypothetical pumping scenarios based on ground-water-use trends from 1980 to 2000 (Fanning, 2003).
• Four steady-state pumping scenarios were developed to simulate a range of pumping and climatic conditions affecting potential contaminant migration from the SRS:
  • 2002 observed pumping and boundary conditions for an average year.
  • 2002 observed pumping and boundary conditions for an average year with SRS pumping discontinued.
  • Projected 2020 pumping and boundary conditions for an average year.
  • Projected 2020 pumping and boundary conditions for a dry year.
• The USGS particle-tracking code MODPATH (Pollock, 1994) was used to generate advective water-particle path lines and time-of-travel based on MODFLOW simulations of the four scenarios. Results of model simulations and particle tracking were summarized in USGS Scientific Investigations Report 2006-5195 (Cherry, 2006). Major findings include:
  • Simulated ground-water flowpaths for each of the four pumping scenarios indicate that time-of-travel from recharge areas originating near central SRS (D and K Areas) westward into Georgia range from 110 years to 800 years (facing page).
  • Particle-tracking analysis indicates travel times and flowpaths are similar for the various pumping scenarios; however, the shutdown of the SRS production wells allows fewer particles to penetrate into deeper units (layers A3– A5), and median travel times are decreased by about 90 years.