Surrogate Analysis and Index Developer (SAID) tool

Open-File Report 2015-1177
Federal Interagency Sedimentation Project and Midwest Region River Sediments and Nutrients Investigations Initiative
By: , and 



The use of acoustic and other parameters as surrogates for suspended-sediment concentrations (SSC) in rivers has been successful in multiple applications across the Nation. Tools to process and evaluate the data are critical to advancing the operational use of surrogates along with the subsequent development of regression models from which real-time sediment concentrations can be made available to the public. Recent developments in both areas are having an immediate impact on surrogate research and on surrogate monitoring sites currently (2015) in operation.

The Surrogate Analysis and Index Developer (SAID) standalone tool, under development by the U.S. Geological Survey (USGS), assists in the creation of linear regression models that relate constituent and surrogate parameters by providing visual and quantitative diagnostics to the user. SAID also processes acoustic parameters to be used as explanatory variables for SSC. The sediment acoustic method utilizes acoustic parameters from fixed-mount stationary equipment. The theory and method used by the SAID tool have been described in recent publications. The tool also serves to support sediment-acoustic-index methods and other surrogate guidelines such as turbidity and SSC (Rasmussen and others, 2009).

The regression models created in SAID can be used in utilities that have been developed to work with the USGS National Water Information System (NWIS) and for the USGS National Real-Time Water Quality (NRTWQ) Web site. The real-time dissemination of predicted SSC and prediction intervals for each time step has substantial potential to improve understanding of sediment-related water quality and associated engineering and ecological management decisions.

Suggested Citation

Domanski, M.M., Straub, T.D., and Landers, M.N., 2015, Surrogate Analysis and Index Developer (SAID) tool (version 1.0, September 2015): U.S. Geological Survey Open-File Report 2015–1177, 38 p.,

ISSN: 2331-1258 (online)

Table of Contents

  • Abstract
  • Introduction
  • Overview
  • Data
  • ADVM Parameter Processing and Plotting (optional in SAID)
  • Linear Model
  • SAID Workspace
  • Acknowledgments
  • References Cited
  • Appendix 1. The Surrogate Analysis and Index Developer (SAID) Tool Workspace Structure
Publication type Report
Publication Subtype USGS Numbered Series
Title Surrogate Analysis and Index Developer (SAID) tool
Series title Open-File Report
Series number 2015-1177
DOI 10.3133/ofr20151177
Year Published 2015
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Illinois Water Science Center
Description Report: vi, 36 p.; HTML Document
Online Only (Y/N) Y
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details