Savanna tree species have been shown to transfer groundwater to shallower soils in a process known as hydraulic redistribution (HR). The longleaf pine (Pinus palustris) savanna of southwestern Georgia is an ideal ecosystem for investigating HR and plant water use of distinct water resources due to excessively well-drained sandy soils and a relatively shallow rain-fed water table. This study aims to quantify differences in HR among three dominant tree species and detect water availability benefits conferred to the understory plant communities of the longleaf pine ecosystem. We found all three species were capable of HR accounting for 30% - 40% of daily transpiration at an individual and a stand level. Stable isotope analysis revealed these species have access to both shallow soil water (< 100cm) and deeper ground water. We performed a manipulate root-exclusion experiment and found four understory functional groups had a significant pre-dawn water advantage from redistributed water.