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1 September 2006 Channel morphology and P uptake following removal of a small dam
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Dam removal is becoming an increasingly common management solution for aging dams, and evaluation of the impact of dam removal on basic attributes of streams such as nutrient uptake and transport is essential. The removal of 2 small dams from a forested, 2nd-order stream in Wisconsin allowed us to study how nutrient dynamics were influenced by changes in channel geometry and bed material. We calculated P uptake and transient storage metrics from a series of 19 short-term injections, measured cross-sectional profiles, and determined benthic sediment size at regular intervals for 2 mo before and after the removals. We also repeated these measurements over the same time period the following year. Nutrient uptake was highly variable, and the stream changed from being a soluble reactive P (SRP) sink to being a source several times over the study period. Uptake lengths increased immediately after dam removal but differences between measurements made before and after removal were not significant. We found no significant relationship between uptake length and benthic sediment composition, channel geometry, or water residence time over the course of the dam removals. Our results indicate that changes in physical channel attributes did not play an important role in controlling SRP retention, probably because the impact of dam removal was small compared with the natural variability of this system.

Cailin H. Orr, Kristy L. Rogers, and Emily H. Stanley "Channel morphology and P uptake following removal of a small dam," Journal of the North American Benthological Society 25(3), 556-568, (1 September 2006).[556:CMAPUF]2.0.CO;2
Received: 8 April 2005; Accepted: 15 March 2006; Published: 1 September 2006

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