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Solvers

Slope Area Computation (SAC)

What is the Slope-Area Computation (SAC)?

The Slope-Area Computation (SAC) is a solver used to compute peak flood discharges from measurements of high-water marks along a stream reach. The original approach was developed by T. Dalrymple and M. Benson of the U.S. Geological Survey (USGS) in the 1960s and subsequently modified and coded by a long list of USGS employees, including Janice Fulford. The solver was further improved and prepared for installation in iRIC by Keisuke Inoue of Mizuho Instrumentation and Research with direction from Jonathan Nelson, Bob Holmes and many other users at the USGS. The solver uses a general version of the slope-area method to estimate flows based on high-water marks and prescribed roughness values.

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SAC Documentation

MEASUREMENT OF PEAK DISCHARGE by the SLOPE-AREA METHOD - TWRI Book 3 Chapter A2

USER’S GUIDE TO SAC

A COMPUTER PROGRAM FOR COMPUTING DISCHARGE BY SLOPE-AREA METHOD - Open-File Report 94-360

Slope Area Computation - Tutorial 1

A basic tutorial on the workflow of the SAC solver in iRIC.

Data for SAC Tutorial 1

This zip file contains the data for Tutorial 1

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