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Data Series 247

In cooperation with the Texas Commission on Environmental Quality

Summary of Percentages of Zero Daily Mean Streamflow for 712 U.S. Geological Survey Streamflow-Gaging Stations in Texas Through 2003

By William H. Asquith, Joseph Vrabel, and Meghan C. Roussel

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Report PDF (32.8 MB)

 

Abstract

Analysts and managers of surface-water resources might have interest in the zero-flow potential for U.S.Geological Survey (USGS) streamflow-gaging stations in Texas. The USGS, in cooperation with the Texas Commission on Environmental Quality, initiated a data and reporting process to generate summaries of percentages of zero daily mean streamflow for 712 USGS streamflow-gaging stations in Texas. A summary of the percentages of zero daily mean streamflow for most active and inactive, continuous-record gaging stations in Texas provides valuable information by conveying the historical perspective for zero-flow potential for the watershed. The summaries of percentages of zero daily mean streamflow for each station are graphically depicted using two thematic perspectives: annual and monthly. The annual perspective consists of graphs of annual percentages of zero streamflow by year with the addition of lines depicting the mean and median annual percentage of zero streamflow. Monotonic trends in the percentages of zero streamflow also are identified using Kendall’s τ. The monthly perspective consists of graphs of the percentage of zero streamflow by month with lines added to indicate the mean and median monthly percentage of zero streamflow. One or more summaries could be used in a watershed, river basin, or other regional context by analysts and managers of surface-water resources to guide scientific, regulatory, or other inquiries of zero-flow or other low-flow conditions in Texas.

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Suggested citation:

Asquith, W.H., Vrabel, Joseph, and Roussel, M.C., 2007, Summary of percentages of zero daily mean streamflow for 712 U.S. Geological Survey streamflow-gaging stations in Texas through 2003: U.S. Geological Survey Data Series 247, 721 p.



Contents

Abstract

Introduction

Summary of Percentages of Zero Daily Mean Streamflow for Texas

Annual Perspective of Percentages of Zero Streamflow

Monthly Perspective of Percentages of Zero Streamflow

General Discussion

References

Index of Station Numbers

 


For additional information contact:
Director, Texas Water Science Center
U.S. Geological Survey
8027 Exchange Drive
Austin, Texas 78754-4733
 
World Wide Web: http://tx.usgs.gov/
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