By A.T. Rutledge
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The computer programs included in this report can be used to develop a mathematical expression for recession of ground-water discharge and estimate mean ground-water recharge and discharge. The programs are intended for analysis of the daily streamflow record of a basin where one can reasonably assume that all, or nearly all, ground water discharges to the stream except for that which is lost to riparian evapotranspiration, and where regulation and diversion of flow can be considered to be negligible. The program RECESS determines the master reces-sion curve of streamflow recession during times when all flow can be considered to be ground-water discharge and when the profile of the ground-water-head distribution is nearly stable. The method uses a repetitive interactive procedure for selecting several periods of continuous recession, and it allows for nonlinearity in the relation between time and the logarithm of flow. The program RORA uses the recession-curve displacement method to estimate the recharge for each peak in the streamflow record. The method is based on the change in the total potential ground-water discharge that is caused by an event. Program RORA is applied to a long period of record to obtain an estimate of the mean rate of ground-water recharge. The program PART uses streamflow partitioning to estimate a daily record of base flow under the streamflow record. The method designates base flow to be equal to streamflow on days that fit a requirement of antecedent recession, linearly interpolates base flow for other days, and is applied to a long period of record to obtain an estimate of the mean rate of ground-water discharge. The results of programs RORA and PART correlate well with each other and compare reasonably with results of the corresponding manual method.
Abstract
Introduction
Applicability of methods
Overview of programs and files
Compiling, loading, and executing programs
Preparation of data files
Catalogue file STATION
Creating daily-values files
Screening daily-values files .
Computer programs for describing the recession of ground-water discharge
Mathematical basis
Program RECESS
The algorithm
Program execution
Output files
Program CURV
Computer program for estimating mean ground-water recharge
Theory and method development
Program RORA
The algorithm
Program execution
Output files
Comparison of results of manual and computerized methods
Sensitivity to variations in recession index
Sensitivity to variations in the requirement of antecedent recession
Computer program for estimating mean ground-water discharge
Method developmen
Program PART
The algorithm
Program execution
Output files
Comparison of results of manual and computerized methods
Comparison of estimates of recharge and discharge
Summary
References cited
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