Data Series 412
U.S. GEOLOGICAL SURVEY
Data Series 412
Prepared in cooperation with the Idaho Department of Environmental Quality and the Bureau of Reclamation
By Alan Rea and Kenneth D. Skinner
Figure 1. Spatial distribution of perennial streams and subbasins from National Hydrography Dataset High-Resolution, and 7.5-minute quadrangle boundaries in northern Idaho.
Figure 2. Location of study area, streamflow-gaging stations, and eight regions used to estimate low-flow frequency statistics for unregulated streams in Idaho.
Figure 3. Stream locations determined by differences in drainage between the NHD and flow paths of a NED-derived stream, resultant NHD catchment delineations using unmodified NED digital elevation model (DEM) data, and resultant NHD catchment delineations using the HydroDEM.
Figure 4. Schematic diagram of AGREE process in a Digital Elevation Model cross section.
Figure 5. Screen captures showing shaded-relief view of Elevation Derivatives for National Applications (EDNA) data near Arrowrock Dam, and shaded-relief view of modified HydroDEM with burning of NHD streams near Arrowrock Dam, in Idaho.
Figure 6. Screen captures showing shaded-relief view of Elevation Derivatives for National Applications (EDNA) data in an area of placer mining, and shaded-relief view of modified HydroDEM with burning of NHD streams in an area of placer mining in Idaho.
Figure 7. Screen captures showing view of Elevation Derivatives for National Applications (EDNA) data in a relatively flat, valley location, and view of modified HydroDEM with burning of NHD streams in a relatively flat, valley location in Idaho.
Figure 8. Spatial distribution of modeled perennial streams and subbasins in northern Idaho.
Table 1. Regression equations for the 7Q2 low-flow statistic for unregulated streams in regions 1–8 in Idaho.
Table 2. Example instructions for deleting data components from geospatial datasets.
Table 3. ArcHydro datasets tiled by 8-digit Hydrologic Unit Code.
Table 4. Selected data elements stored in the ArcHydro global geodatabase for Idaho.
This report is available online in Portable Document Format (PDF). If you do not have the Adobe Reader, it is available for free download from Adobe Systems Incorporated.
Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 7.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.
Send questions or comments about this report to the author, A.H. Rea, (208) 387-1323.
For more information about USGS activities in Idaho, visit the USGS Idaho Water Science Center home page.