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Open-File Report 2011–1166

Prepared in cooperation with The Nature Conservancy

Environmental Flow Allocation and Statistics Calculator

By Christopher P. Konrad

Abstract

The Environmental Flow Allocation and Statistics Calculator (EFASC) is a computer program that calculates hydrologic statistics based on a time series of daily streamflow values. EFASC will calculate statistics for daily streamflow in an input file or will generate synthetic daily flow series from an input file based on rules for allocating and protecting streamflow and then calculate statistics for the synthetic time series. The program reads dates and daily streamflow values from input files. The program writes statistics out to a series of worksheets and text files. Multiple sites can be processed in series as one run. EFASC is written in Microsoft® Visual Basic© for Applications and implemented as a macro in MicrosoftOffice Excel 2007®. EFASC is intended as a research tool for users familiar with computer programming. The code for EFASC is provided so that it can be modified for specific applications. All users should review how output statistics are calculated and recognize that the algorithms may not comply with conventions used to calculate streamflow statistics published by the U.S. Geological Survey.

First posted July 20, 2011

For additional information contact:
Director, Washington Water Science Center
U.S. Geological Survey
934 Broadway, Suite 300
Tacoma, Washington 98402
http://wa.water.usgs.gov

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Suggested citation:

Konrad, C.P., 2011, Environmental flow allocation and statistics calculator: U.S. Geological Survey Open-File Report 2011-1166, 46 p.



Contents

Abstract

Introduction

General Approach

Instructions

Summary


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