Scientific Investigations Report 2008–5105

In cooperation with the West Virginia Department of Environmental Protection, Division of Water and Waste Management

Estimating Selected Streamflow Statistics Representative of 1930–2002 in West Virginia

By Jeffrey B. Wiley

Scientific Investigations Report 2008–5105

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Abstract

Regional equations and procedures were developed for estimating 1-, 3-, 7-, 14-, and 30-day 2-year; 1-, 3-, 7-, 14-, and 30-day 5-year; and 1-, 3-, 7-, 14-, and 30-day 10-year hydrologically based low-flow frequency values for unregulated streams in West Virginia. Regional equations and procedures also were developed for estimating the 1-day, 3-year and 4-day, 3-year biologically based low-flow frequency values; the U.S. Environmental Protection Agency harmonic-mean flows; and the 10-, 25-, 50-, 75-, and 90-percent flow-duration values.

Regional equations were developed using ordinary least-squares regression using statistics from 117 U.S. Geological Survey continuous streamflow-gaging stations as dependent variables and basin characteristics as independent variables. Equations for three regions in West Virginia—North, South-Central, and Eastern Panhandle—were determined. Drainage area, precipitation, and longitude of the basin centroid are significant independent variables in one or more of the equations.

Estimating procedures are presented for determining statistics at a gaging station, a partial-record station, and an ungaged location. Examples of some estimating procedures are presented.


Contents

Abstract

Introduction

Description of Study Area

Previous Studies

Selected Streamflow Statistics

Development of Equations for Estimating Selected Streamflow Statistics

Basin Characteristics

Data Correlation

Regional Regression Analysis

Procedures for Estimating Selected Streamflow Statistics

At a Gaging Station

At a Partial-Record Station

At an Ungaged Location

Upstream From a Gaging Station or Partial-Record Station

Downstream From a Gaging Station or Partial-Record Station

Between Gaging Stations and (or) Partial-Record Stations

Hydrologic Conditions Change Linearly between Stations

Hydrologic Conditions Change Linearly to the Regional Hydrologic Conditions between Stations

Not on the Same Stream as a Gaging Station or Partial-Record Station

Example Applications of Estimating Procedures

Accuracy and Limitations of Estimating Procedures

Summary

Acknowledgments

References Cited

Appendix 1. Transferring Flood Statistics to Ungaged Locations

Figures

1–3. Maps showing—

1. Physiographic provinces and Climatic Divide in West Virginia.

2. U.S. Geological Survey streamflow-gaging stations used in this study that are in West Virginia and adjacent states.

3. The North, South-Central, and Eastern Panhandle Regions of West Virginia for which equations for estimating selected streamflow statistics were developed.

4–5. Graphs showing—

4. LOESS curves of absolute differences between 25-percent-duration flow (D25) determined at streamflow-gaging stations and values estimated from (1) regional equations, and (2) drainage-area ratios.

5. LOESS curves of absolute differences between 3-day, 5-year hydrologically based flow (3Q5) determined at streamflow-gaging stations and values estimated from (1) regional equations, and (2) drainage-area ratios.

Tables

1. Estimating equations for selected streamflow statistics for the North, South-Central, and Eastern Panhandle Regions of West Virginia.

2. Pairs of U.S. Geological Survey streamflow-gaging stations in West Virginia or adjacent states that were evaluated to quantify the definition of ″near″ for application of the drainage-area-ratio method in this study.

3. Values of the exponent (EX), and upstream (RUS) and downstream (RDS) limits of the drainage-area ratios used to quantify the definition of ″near″ for estimating selected statistics at ungaged locations in West Virginia and adjacent states.


Download: PDF of SIR2008–5105 (2.9 MB)



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