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Base-flow recession time constant (tau) contours in the Niobrara National Scenic River in Nebraska, 2016-18 This dataset contains base-flow recession time constant (tau) contours that are interpreted from tau values calculated at streamgages in the Niobrara National Scenic River study area. The contours were created by interpolating the calculated tau values using geostatistical kriging methods. Kriging is a geostatistical method that can be used to determine optimal weights for measurements at sampled locations (streamgages) for the estimation of values at unsampled locations (ungaged sites). The kriged tau map could be used (1) as the basis for identifying areas with different hydrologic responsiveness, and (2) in the development of regional low-flow regression equations. The Geostatistical Analyst tools in ArcGIS Pro... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Brown, Cherry, Keya Paha, Nebraska, Niobrara, All tags... geoscientificInformation, groundwater and surface-water interaction, inlandWaters, kriging, seepage studies, stream-gage measurement, streamflow, Fewer tags Calculated base-flow recession time constants at streamgages in the Niobrara National Scenic River in Nebraska, 2016-18 The base-flow recession time constant (tau) is a hydrologic index that characterizes the ability of a ground-water system to supply flow to a stream draining from that system. The magnitude of tau indicates the degree of hydraulic conductivity of the stream to the groundwater system. Larger tau values indicate a stronger dependence on the groundwater system for streamflows, a smaller base-flow recession value indicates that the stream is not as dependent on the groundwater system for streamflows. Tau and other correlated hydrologic indices have been used as explanatory variables to greatly improve the predictive power of low-flow regression equations. Tau can also be used as an indicator of streamflow dependence... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Brown, Cherry, Keya Paha, Nebraska, Niobrara, All tags... geoscientificInformation, groundwater and surface-water interaction, inlandWaters, seepage studies, stream-gage measurement, streamflow, Fewer tags