GLSNet

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Water Resources of the United States

Regional hydrologic regression and NETwork analysis using Generalized Least Squares

The GLSNet procedure uses an analysis of residuals technique to estimate a regional regression equation to predict flow characteristics at ungaged sites. The regression analysis assigns different weights to observed flow characteristics. These weights are based on record length, cross correlation with flow characteristics at other sites, and an assumed model error structure.

Stedinger and Tasker (1985, 1986) documented the usefulness of an estimated generalized least squares (EGLS) regression procedure for regional regression of streamflow characteristics. The EGLS procedure assigns different weights to observed flow characteristics based on their record length, cross correlation with flow characteristics at other sites, and the model error variance.Tasker and Stedinger (1989) provide further details on how the elements of the weighting matrix are determined.

The problem of identifying the sites from which to collect future streamflow data is formulated as a mathematical program using regional information and is subject to budget constraints. An approximate solution is obtained using a step-backward technique that identifies gaging station sites, either existing or new, to discontinue data collection, or not start data collection, respectively, if the budget is exceeded. The method allows a network manager to design a nearly optimal streamflow data network for collecting regional information.

Current Version:	4.0
Release Date:	January 27, 2005
Documentation:	NOTE: Electronic and/or print versions of many U.S. Geological Survey reports can be found at the Publications Warehouse (http://infotrek.er.usgs.gov/pubs/)
	Version History ( RELEASE.TXT)
	Tasker, G.D., and Stedinger, J.R., 1989, An operational GLS model for hydrologic regression: Journal of Hydrology, v. 111, p. 361-375.

Distribution Files
Version	Operating System	Download File	Description
4.0 27Jan2005	MS-DOS	README.TXT	Installation and usage information
	MS-DOS	glsnet4_0.exe (2.51MB)	Self-installing executable, includes executable program, test data, source code, and documentation
	Sun Solaris	README.TXT	Installation and usage information
	Sun Solaris	glsnet4.0.Solaris.tar.gz (1.3MB)	Compressed tar file, includes executable program, test data, source code, and documentation
	Unix	glsnet4.0.source.tar.gz (705K)	Compressed tar file, includes source code, test data, and documentation
2.5 29Sep1997	MS-DOS (NOT Windows XP)	README	Installation and usage information
	MS-DOS (NOT Windows XP)	glsnet2_5.exe (2.51MB)	Self-installing executable, includes executable program, test data, and documentation. This WILL NOT run under Windows XP nor under earlier Windows with current updates
	Data General AViiON	README	Installation and usage information
	Data General AViiON	glsnet2.5.DGUX.tar.gz (1.3MB)	Compressed tar file, includes executable program, test data, source code, and documentation
	Unix	glsnet2.5.source.tar.gz (705K)	Compressed tar file, includes source code, test data, and documentation

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