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Thalweg (Longitudinal) and Cross Sectional Surveys
In order to conduct this type of monitoring procedure, a surveyor's level is used to map out a designated length of channel. When conducting this longitudinal survey, the surveyors follow the deepest part of the channel, called the thalweg. At predetermined points, a detailed cross section is also mapped. These pieces of information track changes in channel morphology over time, such as channel width and depth, and help us to answer questions such as:
- What changes are occurring in the channel over time?
- Is the level of the streambed increasing or decreasing over time?
- Which watersheds on our property are more susceptible to erosion?
- What size flow events results in a channel change?
- Do changes in the channel have positive/negative effects on habitat quality?
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