Prepared in cooperation with the
Department of Transportation Federal Highway Administration

Estimating Basin Lagtime and Hydrograph-Timing Indexes Used to Characterize Stormflows for Runoff-Quality Analysis

By Gregory E. Granato

Contents:
  Return to Index Page
  USGS SIR 2012-5110
  Information about and links to the Basin Lagtime Files
  Information about and links to the Basin Lagtime Regression Equation File
  Information about and links to the Hydrograph Recession Files
  USGS Software Disclaimer
  Copyright and License Information

Main Report:
  USGS Scientific Investigations Report 2012-5110 -- The text of the report documenting the current study.

Basin Lagtime Documentation Files:
The compilation database contains the basin lagtime references, the basin lagtime data, the USGS streamgages used to calculate the triangular-hydrograph recession-ratio statistics, information about the 10,136 USGS streamgages in the instantaneous data warehouse as of 8/12/2011 (most of these will be ported to the NWIS Web database), and selected basin properties from the USGS GAGES database as of 10/30/2010.

  CompilationDatabase.zip -- A zip file containing the basin lagtime database (Compilation.mdb in MS Access 2000 format) and the following documentation files.
  CompilationDataDict.pdf -- The data dictionary describing the basin lagtime database.
  CompilationDataDictDetails.pdf -- The data dictionary describing the basin lagtime database with deiailed field definitions.
  CompilationDatabasePlate.pdf -- Data structures of the basin lagtime compilation database--Entity/Relationship (E/R) Diagram.

Basin Lagtime Regression Equation File:
  ExamplePredictionIntervals.xls -- Microsoft Excel spreadsheet with spreadsheets for calculating the regression equation results and the associated 90 percent prediction intervals.

Hydrograph Recession Files:
  ConvertIDAtoBEST: A program for converting RDB files from the Instantaneous Data Archive format to a tab-delimited text file format. Please note future plans are to move all remaining IDA data to NWISWeb sometime in 2013 at which time IDA will be discontinued.
   See Explanation

  Microsoft Excel spreadsheet templates for fitting instantaneous steamflow data to triangular hydrographs:
   See Explanation:
   Hydrograph01.xls -- This file can be used to process storms with up to 480 data points (5 days of 15 minute data)
   Hydrograph02.xls -- This file can be used to process storms with up to 880 data points (9 days of 15 minute data)

  Example spreadsheets for fitting USGS curvilinear hydrographs to triangular hydrographs:
   USGS01.xls -- Example 1
   USGS02.xls -- Example 2
   USGS03.xls -- Example 3

  Spreadsheets for fitting triangular-hydrograph recession ratios to a triangular distribution:
   See Explanation

Disclaimer
The computer files published with this report were prepared by the U.S. Geological Survey (USGS) in cooperation with the Federal Highway Administration (FHWA); both are agencies of the U.S. Government. This information was compiled for quantitative analysis of available data on a national and(or) regional scale. Although the information, metadata, and computer files have been subjected to rigorous review and are substantially complete and accurate, this information is presented without warranty, expressed or implied, as to accuracy or completeness. The USGS and the FHWA reserve the right to revise the software and the data pursuant to further analysis and review. These data and the software on the digital media have been used by the USGS, and are released on condition that the USGS, the FHWA, or the U.S. Government may not be held liable for any damages resulting from their use. The use of trade or product names on this computer disk is for identification purposes only and does not constitute endorsement by the U.S. Government.

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Copyright and License Information
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U.S. Geological Survey Contact Information
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