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As part of the National Water-Quality Assessment Program, ecological investigations were conducted in 23 reaches of 16 streams in the Santee River Basin and Coastal Drainages study unit in North and South Carolina during 1996-98. Habitat characteristics, such as stream width and depth, bank composition, bank vegetative cover, stream shading by overhanging vegetation, and streambed composition were recorded. Algal and benthic invertebrate communities were sampled using quantitative and qualitative techniques. These data will provide information needed to: (1) support findings of the effects of human landuse activities on water quality by augmenting or enhancing physical and chemical water-quality data, (2) provide a basic overview of aquatic community structure in selected stream reaches in the study unit, and (3) provide a means for comparing aquatic communities in subsequent years of the assessment program. INTRODUCTION During 1996-98, ecological data were collected in the Santee River Basin and Coastal Drainages (SANT) study unit (fig. 1) as part of the U.S. Geological Survey (USGS) National Water-Quality Assessment (NAWQA) Program. An objective of this ongoing investigation is an attempt to integrate ecological data with more traditional chemical and physical methods of determining the quality of water. These data were collected coincidentally with surface-waterquality data (Maluk, 2000), bed-sediment and tissue data (Abrahamsen, 1999), and ground-water-quality data as part of the comprehensive investigation within the study unit (Hughes and others, 2000). The NAWQA Program is designed to evaluate the quality of the Nation's water resources and to link an assessment of the status and trends in water quality with an understanding of the natural and human factors that affect the quality of water. That assessment is based on a nationally consistent design structure that incorporates a multiscale, interdisciplinary approach for ground-water and surface-water investigations. The goal of the program is to provide an understanding of the causes of processes that affect water quality at various spatial and temporal scales, so that knowledge

Ecological data collected in the Santee River basin and coastal drainages, North and South Carolina, 1996–98