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TWSSTTargeted Watershed Site Selection Tool

TWSST reportThe Wisconsin Department of Natural Resources (WDNR) Bureau of Water Quality has developed the Targeted Watershed Site Selection Tool (TWSST) to assist in the selection of monitoring locations in Targeted Watershed Assessments (TWAs). TWSST is a watershed-scale classification system that groups stream reaches according to a variety of stream channel and landscape-level physical characteristics. The physical characteristics in the classification system were selected to incorporate both natural and anthropogenic factors with demonstrated relationships to water quality and aquatic biota. These characteristics include land cover, soils, slope, stream flow volume, and water temperature.

The TWSST model can be used to aid in setting up an efficient monitoring design in a watershed where very little known information exists on waterbody condition. The model can also be used on previously collected data to determine the spatial extent on a stream network that a particular monitoring location represents.

Output from the TWSST includes maps of the stream groups, narrative interpretations of each stream group, and summary statistics of stream characteristics within groups.  These results are available as summary reports for each watershed and as interactive map layers in WDNR’s Water Condition Viewer, a web-based mapping application. This provides staff and biologists a readily accessible way to visualize landscape changes in targeted watersheds alongside a variety of other data layers relevant to the monitoring site selection process.

Last revised:

Tuesday May 30 2017