Field Data Collection: Survey Points

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Figure 2: The two types of topographic surveys of the Sandy River near the site of Marmot Dam are shown overlain on a 2008 (post-removal) aerial photograph. The blue points are fixed cross sectional surveys, which have been repeated annually. The orange points are event-based topographic surveys that map out significant features such as water's edge, slope breaks, etc…; the dark orange lines connect points that trace common features. The black line is the former location of the dam.

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Chuck Podolak, Johns Hopkins University
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