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Geochemical evaluation of hydrogeologic interaction between the Edwards and Trinity Aquifers based on multiport well assessment in Central Texas

16TH SINKHOLE CONFERENCE NCKRI SYMPOSIUM 8 could address the origin of groundwater, and interconnections between different hydrostratigraphic units. The differences in TDS, SO4 2–, and NO3 – concentrations between Edwards and Trinity Aquifers are considered statistically significant. The isotopic tracers (δ18O and δD; 3H and 14C; 87Sr/86Sr) provide information on the origin of recharge, residence time of groundwater, and mineral-solution reactions in soils/aquifer rocks in these formations. Hydraulic head data further support limited vertical communication between the aquifers. This study indicates that vertical inter-aquifer flow between the Edwards and Trinity Aquifers is limited in the study area. These implications support independent groundwater management of these two essential aquifer systems in Central Texas.