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Open-File Report 2011–1176

Prepared in cooperation with the Afghanistan Geological Survey, Ministry of Mines under the
auspices of the Task Force for Business and Stability Operations, Department of Defense

Technique for Estimation of Streamflow Statistics in Mineral Areas of Interest in Afghanistan

By Scott A. Olson and Thomas J. Mack

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Abstract

A technique for estimating streamflow statistics at ungaged stream sites in areas of mineral interest in Afghanistan using drainage-area-ratio relations of historical streamflow data was developed and is documented in this report. The technique can be used to estimate the following streamflow statistics at ungaged sites: (1) 7-day low flow with a 10-year recurrence interval, (2) 7-day low flow with a 2-year recurrence interval, (3) daily mean streamflow exceeded 90 percent of the time, (4) daily mean streamflow exceeded 80 percent of the time, (5) mean monthly streamflow for each month of the year, (6) mean annual streamflow, and (7) minimum monthly streamflow for each month of the year. Because they are based on limited historical data, the estimates of streamflow statistics at ungaged sites are considered preliminary.

First posted September 2011

For additional information contact:
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Suggested citation:

Olson, S.A., and Mack, T.J., 2011, Technique for estimation of streamflow statistics in mineral areas of interest in Afghanistan: U.S. Geological Survey Open-File Report 2011–1176, 17 p., at https://pubs.usgs.gov/of/2011/1176/.



Contents

Abstract

Introduction

Streamgages Used for Estimation of Streamflow Statistics

Basin Characteristics for Gaged and Ungaged Locations

Estimation of Streamflow Statistics at Ungaged Locations

Equations for Estimation of Streamflow Statistics at Ungaged Locations

Application of Streamflow Statistics at Ungaged Locations

Limitations of Streamflow Statistics at Ungaged Locations

Summary

References Cited

Appendix 1. Basin Characteristics for Streamgages Used for Estimation of Streamflow at Ungaged Locations in Mineral Areas of Interest in Afghanistan

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