Thank you for attending!
Surface-Water Quality Modeling Workshop 2002
October 29-31, 2002
by the USGS National Water Quality Assessment (NAWQA) Program
The agenda includes links to the presentations given at the workshop.
This 3-day workshop provided an introduction to SPARROW (SPAtially Referenced Regressions On Watershed attributes), a recently developed technique for modeling the occurrence and transport of contaminants in surface waters through statistical analysis of network monitoring and watershed attribute data. SPARROW has been applied to surface-water nutrients, pesticides, suspended sediment, and fecal bacteria, and is applicable to other measures of water quality, stream biology and streamflow.
Presentations during the
first day provided background on the modeling technique and illustrate
applications to research and management issues. More detailed presentations and discussions during the following
two days provided participants with the essential information for developing
and applying basic SPARROW models.
from regional, national, and international applications
applications (e.g., source characterization, targeting of controls, TMDLs)
applications (e.g., the evaluation of hydrologic and biogeochemical processes)
for developing SPARROW models
· Statistical methods for load estimation, nonlinear parameter estimation, uncertainty analysis
· GIS methods for developing and managing watershed data
· Computer software
Those who attended the
workshop were managers and researchers interested in using the results of
existing calibrated models or developing new models. Developers of new models will require access to watershed data
covering a range of environmental conditions to achieve accurate model
calibration. Typical data requirements
include stream concentrations and pollutant sources that vary over more than
one order of magnitude. Water-quality
records should be at least 2 years long from a network of more than 20
monitoring sites. Knowledge of the
computer software language used in SPARROW (SAS, Fortran) is not required to
attend the workshop, but a basic knowledge of SAS will be required to develop
simple SPARROW models; a fuller knowledge of SAS is required to make extensive
modifications to the model.
Please visit the following website for additional information about SPARROW:
you have any questions regarding the material presented regarding this
workshop, please send the following information via email to:
Richard Alexander email@example.com or call (703) 648-6869.
Department of the Interior, U.S. Geological
Maintainer: Water Webserver Team
Last update: October 24, 2002
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