Two studies investigated floodplain forest vegetation composition with respect to hydrology. The first study compared floodplain vegetation on the Savannah River below Thurmond Dam with vegetation on the minimally regulated Altamaha River. Some vegetation differences were present between rivers, but did not appear to have been caused by dam construction. The second study analyzed longitudinal patterns in floodplain forests. The proportion of wetland to upland vegetation generally increased downstream in the Savannah and Altamaha watersheds. A literature review revealed similar patterns in other watersheds, but found no relationship between vegetation and streamflow across studies.