Surface Water-Groundwater Interactions
Measuring and quantifying the many and varied locations throughout Texas where groundwater and surface water bodies interact can be difficult. An excellent resource is the 2002 USGS publication, “Results of Streamflow Gain-Loss Studies in Texas, With Emphasis on Gains From and Losses to Major and Minor Aquifers” (R.M. Slade Jr., J.T. Bentley, and D. Michaud, USGS Open-file Report 02-068)
Source: USGS Rpt 02-068, Slade et al. 2002 Plates 1 and 2 show the stream gains and losses as small dots along the identified rivers and sub-reaches. Such research is critical to understanding how much water might be entering river basins and how such percolating flows and discharges will change during high and low river flows.
Source: USGS Rpt 02-068. Slade et al. 2002, Plate 1. 
Source: USGS Prt 02-068. Slade et al. 2002, Plate 2