Text / Ecology of Dam Removal

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Title: Ecology of Dam Removal
Creator: Stephen Higgs
Date Created and/or Issued: 2002 February
Contributing Institution: UC Riverside, Library, Water Resources Collections and Archives
Collection: Clearinghouse for Dam Removal Information (CDRI)
Rights Information: Copyrighted
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Description: Scope/Content: Abstract: Rivers and their restoration are complex, and any effort to rehabilitate a river system needs to be based on a sound understanding of the ecological benefits and drawbacks of a proposed restoration plan. Over the past three decades, the scientific community has advanced our understanding of rivers and helped us to realize the significant negative impacts that dams have on river systems. Dams disrupt a river's natural course and flow, alter water temperatures in the stream, redirect river channels, transform floodplains, and disrupt river continuity. 1 These dramatic changes often reduce and transform the biological make-up of rivers, isolating populations of fish and wildlife and their habitats within a river. While there is a need for more specialized research on the ecological impacts of dams and dam removal, several studies indicate that dam removal can be a highly effective river restoration tool to reverse these impacts and restore rivers. Angela T. Bednarek, a Ph.D. candidate at the University of Pennsylvania recently conducted a comprehensive review of the short- and longterm ecological impacts of dam removal. Bednarek conducted a literature search to identify and review all available published (and many unpublished) studies on dam removal to determine if and how dam removal can be effective in improving water quality and restoring fish and wildlife habitat in and around a river. Her study focused on numerous ecological measures that are critical to assessing the positive and negative impacts of dam removal both from short- and longterm perspectives, including: - Flow; - Shift from reservoir to free-flowing river; - Water quality (e.g., temperature and supersaturation); - Sediment release and transport; and - Connectivity (e.g., migration of fish and other organisms). While there are some limited short-term ecological consequences of dam removal, Bednarek's study found that the long-term ecological benefits of dam removal as measured in improved water quality, sediment transport, and native resident and migratory species recovery demonstrates that dam removal can be an effective long-term river restoration tool.
Type: text
Identifier: ark:/86086/n21z441j
1200
Language: eng
Subject: Ecology and river restoration
Fisheries and fish passage
Sediment and channel dynamics
Dams
Dam retirement
Place: Not Specified

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