Alan Rea Kenneth D. Skinner 2009 vector digital data U.S. Geological Survey Data Series 412 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ds412_syntheticperennialstreams Alan Rea Kenneth D. Skinner 2009 raster and vector digital data U.S. Geological Survey Data Series 412 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ds/412/ Perennial streams in Idaho have been modeled using regression equations for 7-day, 2-year low flows (7Q2) described in Wood and others (2009, U.S. Geological Survey Scientific Investigations Report 2009-5015). The model produces "synthetic" streams based on 10-meter resolution digitial elevation models that have been processed to agree closely with 1:24,000-scale National Hydrography Dataset flowlines. Lines having attribute PerCode = 1 represent model grid cells having 7Q2 flow estimates between 0.1 cubic feet per second (ft3/s) and 0.1 minus the standard error for the applicable regional regression equation. Lines having attribute PerCode = 2 represent model grid cells having 7Q2 flow estimates between 0.1 ft3/s and 0.1 plus the standard error for the applicable regional regression equation. Lines having attribute PerCode = 3 represent model grid cells having 7Q2 flow estimates greater than 0.1 ft3/s plus the standard error for the applicable regional regression equation. These three categories of lines indicate approximate levels of uncertainty in the model results, with lines having PerCode = 1 representing the most uncertainty, and lines having PerCode = 3 representing the least uncertainty with respect to representing a perennial stream. The model was developed to provide a more consistent and uniform representation of perennial streams in Idaho than was provided by the hydrographic categories of the National Hydrography Dataset, as of 2004. 2009 publication date Complete None planned -118.566350 -110.219926 49.048670 41.088104 None inlandWaters perennial streams hydrography GCMD Location Keywords Idaho ID NORTH AMERICA UNITED STATES UNITED STATES OF AMERICA None None U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds412_syntheticperennialstreams Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420 Comparisons of the modeled perennial streams with field observations are described in detail in Wood and others (2009, U.S. Geological Survey Scientific Investigations Report 2009-5015). Different regression models were applied to eight different regions in Idaho. Differences in drainage density may be observed at the boundaries between regions. The region boundaries were determined based on similarity of basin characteristics at stream-gage locations, geographic and geomorphic features such as mountain ranges or breaks between mountains and plains, and professional judgement. The model was not developed for the eastern Snake River Plain. This undefined area is delineated in the low-flow regions grid "id_lowreg" in the statewide datasets group included in USGS Data Series 412 (see Larger Work Citation). U.S. Geological Survey 2004 Sioux Falls, SD U.S. Geological Survey http://ned.usgs.gov/ 24000 disc 2004 publication date 1/3-second NED elevation grid U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency, USDA Forest Service, and other Federal, State and local partners 2004 vector digital data http://nhd.usgs.gov/ 24000 disc 2004 publication date High-Resolution NHD hydrography used to burn into elevation model Idaho Department of Water Resources and others Unpublished Material 200506 vector digital data http://www.idwr.idaho.gov/watersheds/default.htm 24000 disc 200506 publication date Idaho 2005 Draft WBD 8-digit HUC boundaries were used as "walls" around processing units Molly S. Wood Alan Rea Kenneth D. Skinner Jon E. Hortness 2009 model U. S. Geological Survey Scientific Investigations Report 2009-5015 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/sir/2009/5015/ paper 2009 publication date Wood and others 2009 regression equations for 7Q2 Development of Hydro-Enforced DEMs. See USGS Data Series 412 report for complete process description. 1/3 arc-second NED High-resolution NHD Idaho 2005 Draft WBD 2007 HydroDEM ESRI ArcInfo 9.2 Applied regression equations to estimate 7Q2 flows for every grid cell for each region. Added and subtracted standard errors to compute ranges of flows representing uncertainty levels. Classified grids into uncertainty ranges and converted to vector shapefile. HydroDEM Wood and others 2009 2007 ID_SyntheticPerennialStreams Vector String 198652 Transverse Mercator 0.999600 -114.000000 42.000000 2500000.000000 1200000.000000 coordinate pair 1.0 1.0 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 ID_SyntheticPerennialStreams Feature Class ESRI shapefile feature attribute table FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. PERCODE Code indicating category of modeled stream Wood and others 2009 1 7Q2 flow estimate between 0.1 cfs and 0.1 cfs minus the standard error, which varies by region Wood and others 2009 2 7Q2 flow estimate between 0.1 cfs and 0.1 cfs plus the standard error, which varies by region Wood and others 2009 3 7Q2 flow estimate greater than 0.1 cfs plus the standard error, which varies by region Wood and others 2009 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds412_syntheticperennialstreams Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. SHP 9.2 ESRI Shapefile 31 MB http://water.usgs.gov/GIS/dsdl/ds412/index.html None. This dataset is provided by USGS as a public service. 20080531 U.S. Geological Survey Ask USGS Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998