The Effects of Sand Dredging on Channel Morphology, Habitat, and Water Quality in Urban DeKalb County Streams
Jackson, C. Rhett
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DeKalb County, Georgia, has instituted a dredging program to reduce sediment loads and increase channel conveyance. Limited data existed on the effects of dredging in Piedmont streams at the time this study was commissioned. This study is being conducted as a joint agreement between DeKalb County and the U.S Army Corps of Engineers to evaluate the effects of dredging in urban streams with sand beds and high sediment loads. Two sites were selected for this study, one active dredge site and one future dredge site Upstream and downstream measurements have been collected and analyzed at the active dredge site for the last two years. Preliminary data analysis suggests that the channel reaches downstream of the active dredge site are moving toward a coarser particle-size distribution and a slightly higher frequency of pools and riffles.