The Effects of Small Dam Removal on the Distribution of Sedimentary Contaminants

  title={The Effects of Small Dam Removal on the Distribution of Sedimentary Contaminants},
  author={Jeffrey T. F. Ashley and Karen L. Bushaw-Newton and Matt Wilhelm and Adam R Boettner and Gregg Drames and David J. Velinsky},
  journal={Environmental Monitoring and Assessment},
With increasing concern over degradation of aquatic resources, issues of liability, and maintenance costs, removal of small dams has become increasing popular. Although the benefits of removal seem to outweigh the drawbacks, there is a relative paucity of studies documenting the extent and magnitude of biological and chemical changes associated with dam removal, especially those evaluating potential changes in contaminant inventories. In August and November of 2000, a run-of-the-river dam on… Expand
Assessing organic contaminant fluxes from contaminated sediments following dam removal in an urbanized river
Overall, dam removal did not cause measurable sediment disturbance or increase the concentration or fluxes of dissolved or particulate PAHs and PCBs, and the employment of passive sampling technology and sediment traps was highly effective in monitoring the concentrations and flux of contaminants moving through the river system. Expand
Effects of small dam removal on stream chemistry in southeastern Pennsylvania
Abstract We examined changes in stream chemistry following the removal of a 2-m-high dam on Manatawny Creek in southeastern Pennsylvania. Our primary objective was to determine the effect of smallExpand
Particle-bound metal transport after removal of a small dam in the Pawtuxet River, Rhode Island, USA.
Changes in flux rates during the study period indicated that river volumetric flow rates acted as the primary mechanism controlling the flux of metals into Pawtuxet Cove and ultimately upper Narragansett Bay. Expand
Reductions in fish-community contamination following lowhead dam removal linked more to shifts in food-web structure than sediment pollution.
Overall, it is demonstrated that lowhead dam removal may effectively reduce ecosystem contamination, largely via shifts in fish food-web dynamics versus sediment contaminant concentrations. Expand
Hydraulic and geomorphological effects of run-of-river dams
The practice of dam removal has received increasing attention as a consequence of maintenance and liability concerns related to the advanced age of many of these structures. Most dams that have beenExpand
Reconstruction of anthropogenic activities in legacy sediments from the Eure River, a major tributary of the Seine Estuary (France)
Abstract Most rivers worldwide are contaminated by various trace metals from different origins, which may be stored for considerable periods of time in depositional areas. Most of these studies areExpand
Watershed Suspended Sediment Supply and Potential Impacts of Dam Removals for an Estuary
Observations and modeling are used to assess potential impacts of sediment releases due to dam removals on the Hudson River estuary. Watershed sediment loads are calculated based onExpand
Influence of four run-of-river dams on channel morphology and sediment characteristics in Illinois, USA
Dams are known to create discontinuities in river flow and sediment transport, with ensuing effects on the fluvial geomorphology of dammed systems. While the effects created by large impoundment damsExpand
Baseline Studies in the Elwha River Ecosystem Prior to Dam Removal: Introduction to the Special Issue
Abstract The planned removal of two dams that have been in place for over 95 years on the Elwha River provides a unique opportunity to study dam removal effects. Among the largest dams everExpand
River Channel Change Following Dam Removal in an Ephemeral Stream
Abstract Dam removal is becoming increasingly common for both small and large structures and is motivated by both environmental (e.g. re-establishing longitudinal connectivity) and engineering (e.g.Expand


Limited bioavailability of sediment pah near an aluminum smelter: Contamination does not equal effects
A Sediment Quality Triad study involving synoptic measures of polycyclic aromatic hydrocarbon (PAH) contamination, toxicity, and resident community (benthic infauna, crab) alteration was conducted toExpand
Hydrophobic organic contaminants in surficial sediments of Baltimore Harbor : Inventories and sources
The heavily urbanized and industrialized Baltimore Harbor/Patapsco River/Back River system is one of the most highly contaminated regions of the Chesapeake Bay. In June 1996, surficial sediments wereExpand
A Preliminary Evaluation of Sediment Quality Assessment Values for Freshwater Ecosystems
Abstract Sediment quality assessment values were developed using a weight of evidence approach in which matching biological and chemical data from numerous modelling, laboratory, and field studiesExpand
Seasonal and annual loads of hydrophobic organic contaminants from the Susquehanna River basin to the Chesapeake Bay.
Principal component analysis of PAH and PCB congener patterns in the particles reveals that the river suspended particles were dominated by autochthonous production in the summer and by resuspended sediment and watershed erosion during the winter and early spring. Expand
The sources of PCBs to the Narragansett Bay estuary
The major rivers and municipal treatment facilities that discharge directly into Narragansett Bay have been surveyed to determine the amount of PCBs associated with their discharges under dry weatherExpand
ABSTRACT: Dam removal has been proposed as an effective method of river restoration, but few integrative studies have examined ecological responses to the removal of dams. In 1999, we initiated anExpand
Tidal river sediments in the Washington, D.C. area. II. Distribution and sources of organic contaminants
Concentration of aliphatic, aromatic, and chlorinated hydrocarbons were determined from 33 surface-sediment samples taken from the Tidal Basin, Washington Ship Channel, and the Anacostia and PotomacExpand
Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuarine sediments
Matching biological and chemical data were compiled from numerous modeling, laboratory, and field studies performed in marine and estuarine sediments. Using these data, two guideline values (anExpand
Atmospheric deposition of organic contaminants to the chesapeake bay
Abstract To estimate loadings of contaminants from the atmosphere to the Chesapeake Bay, ambient atmospheric concentrations and wet deposition fluxes of several polycyclic aromatic hydrocarbonsExpand
Environmental considerations for assessing dam removal alternatives for river restoration
Dam removal has received increasing attention over the last several years as a viable alternative to rehabilitation of unsafe dams and as an alternative for consideration as many hydroelectric damsExpand