USGS Water Resources Applications Software: LOADEST
This page contains a set of links to various online statistical resources. These resources include publications related to load estimation, sampling strategy, detection limits, and continuous water quality variables. Links to statistical software packages distributed by the USGS are also provided.
Note: For additional publications, see the "Applications" section of this Web Site and the "References" section of the LOADEST documentation. Access to journal articles may be restricted to site visitors with personal or institutional subscriptions to the specific journals. Access to PDF files () requires Adobe Reader or an alternate PDF viewer.
Aulenbach, B.T., and
Hooper, R.P., 2006,
The composite method: an improved method for
stream-water solute load estimation: Hydrological
Processes, v. 20, p. 3029-3047, DOI: 10.1002/hyp.6147.
HTML | PDF (207KB)
Cohn, T.A., 2005,
Estimating contaminant loads in rivers: An application
of adjusted maximum likelihood to type 1 censored
data: Water Resources Research, v. 41, W07003,
doi:10.1029/2004WR003833
HTML | PDF (197KB)
Helsel, D.R., and Hirsch R.M., 2002,
Statistical methods in water resources: U.S.
Geological Survey Techniques of Water-Resources Investigations,
book 4, chapt. A3, 510 p.
HTML | PDF (9.6MB)
Horowitz, A.J., 2003,
An evaluation of sediment rating curves for estimating
suspended sediment concentrations for subsequent flux
calculations: Hydrological Processes, v. 17, no. 17,
p. 3387-3409, doi:10.1002/hyp.1299
HTML | PDF (1.6MB)
Stow, C.A., Reckhow, K.H., and Qian, S.S.,
2006,
A bayesian approach to retransformation bias in
transformed regression: Ecology, v. 87, no. 6, p.
1472-77.
HTML | PDF (179KB)
Endreny, T.A., Hassett,
J.M., and Wolosoff, S.E., 2005,
Robustness of pollutant loading estimators for sample
size reduction in a suburban watershed: International
Journal of River Basin Management, v. 3, no. 1, p. 53-66.
HTML
Horowitz, A.J., 1995,
The use of suspended sediment and associated trace
elements in water quality studies : IAHS Special
Publication No. 4, IAHS Press, Wallingford, Oxfordshire, U.K.,
58 p.
PDF (29KB)
Horowitz, A.J., Elrick, K.A., and Smith,
J.J., 2001,
Estimating suspended sediment and trace element fluxes
in large river basins: methodological considerations as applied
to the NASQAN programme : Hydrological Processes, v.
15, no. 7, p. 1107-1132, doi:10.1002/hyp.206
HTML | PDF (253KB)
Robertson, D.M., 2003,
Influence of different temporal sampling sampling
strategies on estimating total phosphorus and suspended
sediment concentration and transport in small streams:
Journal of the American Water Resources Association, v. 39, no.
5, p. 1281-1308.
HTML | PDF (924KB)
Robertson, D.M., and Roerish, E.D.,
1999,
Influence of various water quality sampling strategies
on load estimates for small streams: Water Resources
Research, v. 35, no. 12, p. 3747-3759.
HTML | PDF (158KB)
Sprague, L.A., 2001,
Effects of storm-sampling frequency on estimation of
water-quality loads and trends in two tributaries to Chesapeake
Bay in Virginia: U.S. Geological Survey
Water-Resources Investigations Report 01-4136, 44 p.
PDF (1.1MB)
Helsel, D.R., 1990,
Less than obvious - statistical treatment of data below
the detection limit: Environmental Science &
Technology, v. 24, no. 12, p. 1766-1774,
doi:10.1021/es00082a001.
HTML
Helsel, D.R., 2005,
More Than Obvious: Better Methods for Interpreting
Nondetect Data: Environmental Science &
Technology, v. 39, no. 20, p. 419A-423A.
HTML| PDF (200KB)
Helsel, D.R., 2005,
Nondetects and Data Analysis: Statistics for Censored
Environmental Data: John Wiley and Sons, New York, 268
p.
HTML
Helsel, D.R., 2005,
Insider Censoring: Distortion of Data with
Nondetects: Human and Ecological Risk Assessment, v.
11, no. 6, p. 1127-1137, doi:10.1080/10807030500278586.
HTML
Helsel, D.R., 2006,
Fabricating data: How substituting values for
nondetects can ruin results, and what can be done about
it: Chemosphere, v. 65, no. 11, p. 2434-2439,
doi:10.1016/j.chemosphere.2006.04.051.
HTML | PDF (137KB)
Lee, L, and Helsel, D., 2005,
Baseline models of trace elements in major aquifers of
the United States: Applied Geochemistry, v. 20, no. 8,
p. 1560-1570, doi:10.1016/j.apgeochem.2005.03.008.
HTML | PDF (691KB)
Christensen, V.G.,
Jian, X., Ziegler, A.C., 2000,
Regression analysis and real-time water-quality
monitoring to estimate constituent concentrations, loads, and
yields in the Little Arkansas River, south-central Kansas,
1995-99: U.S. Geological Survey Water-Resources
Investigations Report 00-4126, 36 p.
HTML
Rasmussen, T.J., Ziegler, A.C., Rasmussen,
P.P., 2005,
Estimation of constituent concentrations, densities,
loads, and yields in lower Kansas River, northeast Kansas,
using regression models and continuous water-quality
monitoring, January 2000 through December 2003: U.S.
Geological Survey Scientific Investigations Report 2005-5165,
126 p.
HTML | PDF (14.7MB)
Note: For a complete listing of Water Resource software packages distributed by the USGS, see Water Resources Applications Software.
ESTREND - A System for the Detection of Trends in Water-Quality Data
GCLAS - Graphical Constituent Loading Analysis System
SPARROW - SPAtially Referenced Regressions On Watershed Attributes