Groundwater/Surface Water Interactions in Texas: Implications for Water Resources and Contaminant Transport (TCEQ)

Bridget R. Scanlon, principal investigator

The objective of this study is to assess impacts of groundwater/surface water interactions on the quantity and quality of water in Texas. The assessment will be accomplished through a review of existing studies, an evaluation of the potential impact of groundwater/surface water interactions on both water quality and water quantity, and technology transfer of results to interested agency staff.

BEG will conduct a number of tasks to accomplish the objective. (1) The study will include a review of studies assessing groundwater/surface water (gw/sw) interactions in the U.S. relative to water quality and water quantity issues. (2) Evaluation of impacts of gw/sw interactions on water quality will include comparison of stream water quality with adjacent groundwater quality to assess connectivity. Potential impacts of groundwater discharge on river segments identified as impaired in the Total Maximum Daily Load program will also be examined. The status of knowledge on distribution of riparian vegetation will also be examined because riparian vegetation can markedly affect contamination of surface water from groundwater discharge. (3) Assessing impacts of gw/sw interactions on water quantity will include evaluation of different approaches for hydrograph separation to quantify the component of surface water that is groundwater. Previous programs to model water quantity of surface water (Water Availability Models [WAM]) and groundwater (Groundwater Availability Models [GAM]) will be examined to determine the feasibility of using output from GAM for a selected aquifer as input to WAM. Materials will be developed for technology transfer for interested agency staff. This study began in November 2004 and will continue through August 2005.


For more information, please contact:

Bridget R. Scanlon, principal investigator. Telephone (512) 471-8241;

July 2005