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Evaluating the Pattern and Rate of Ecological Recovery from the Manatawny Creek Dam Removal

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Title: Evaluating the Pattern and Rate of Ecological Recovery from the Manatawny Creek Dam Removal
Creator: THE ACADEMY OF NATURAL SCIENCES
Date Created and/or Issued: 2006 December 08
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: This study was a followup to baseline and post-dam removal studies in Manatawny Creek, near Pottstown, Pennsylvania. Designed to assess longer-term effects of dam removal, the study employed a modified Before-After- Control Impact (BACI) approach to determine how geomorphology and fish, macroinvertebrate and algal assemblages responded to dam removal. The geomorphology assessment showed that bed elevation downstream of the dam had been raised by deposition, but the deposited sediment appeared to be removed by 2005. Bed elevations were stable upstream of the dam. Algal biomass, diatom species richness, macroinvertebrate density and density of several fishes decreased significantly downstream from the dam 12 months after removal. Downstream diatom assemblage composition remained similar to the upstream control site. Algal metrics in 2004 and 2005 were similar to those prior to dam removal. Densities of macroinvertebrates and several fishes decreased significantly between pre-removal stages and 2004, but not between pre-removal stages and 2005. Dam removal had no significant effect on macroinvertebrate taxa richness, EPT richness, and HBI scores in any year. Several species of fish showed changes in fish distribution attributable to changes in habitat in the former impoundment and increased fish passage due to the dam removal
Scope/Content: Author affiliation: Patrick Center for Environmental Research
Type: text
Identifier: ark:/86086/n23n231w
836
Subject: Ecology and river restoration
Sediment and channel dynamics
Dams
Dam retirement
Place: Manatawny Creek, PA
Manatawny Dam

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