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Historical Floodplains

 
 
Figure 1. NetMap's floodplain mapping tool, particularly using high resolution LiDAR DEMs, can be used to identify the current floodplain and historical floodplains, now abandoned due to diking, stream cleaning, agriculture and channel incision; analysis in this figure uses 2.5 m LiDAR in the Nehalem watershed in northwestern coastal Oregon.
 
Figure 2. Floodplains at 3x to 5x may indicate abandoned floodplains, including by dikes and channel incision.
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