Glenn R. Harwell Karl E. Winters William H. Asquith 2018 <p>In 2006, the U.S. Geological Survey (USGS), in<br>cooperation with the Texas Department of Transportation,<br>began collecting annual and approximately quarterly series<br>peak-streamflow data at streamflow-gaging stations in smallto<br>medium-sized watersheds in central and western Texas<br>as part of a crest-stage gage (CSG) network, along with<br>selected flood-hydrograph data at a subset of these stations.<br>CSGs record the peak stage during storm events, which is<br>the maximum gage height (elevation of water surface above<br>a local vertical datum), at each CSG station. Established and<br>widely used indirect methods of peak streamflow estimation<br>and interpretation, such as culvert-flow, slope-area, and<br>flow-over-road methods, are used in conjunction with peak<br>gage height data to create the database of peak streamflow<br>described herein. The CSG network is focused on hydrology<br>of small- to medium-sized watersheds in central and western<br>Texas because additional streamflow data for this semiarid<br>to arid study area will eventually provide for more statistical<br>information and presumably reduced uncertainty in regional<br>regression equations or other regionalized statistical methods<br>for peak-streamflow frequency estimation at ungaged<br>locations. The database of annual and approximately quarterly<br>peak streamflow is published through USGS ScienceBase and<br>described in this report.</p> application/pdf 10.3133/sir20185107 en U.S. Geological Survey Annual and approximately quarterly series peak streamflow derived from interpretations of indirect measurements for a crest-stage gage network in Texas through water year 2015 reports