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13: Models coefficients and statistics for regression models used to estimate streamwater loads for 12 water-quality constituents in 13 watersheds in Gwinnett County, Georgia for water years 2003-2020

Dates

Publication Date
Start Date
2002-10-01
End Date
2020-09-30

Citation

Aulenbach, B.T., Henley, J.C., and Hopkins, K.G., 2023, Watershed characteristics and streamwater constituent load data, models, and estimates for 15 watersheds in Gwinnett County, Georgia, 2000-2021: U.S. Geological Survey data release, https://doi.org/10.5066/P9G8HZTY.

Summary

The dataset contains model coefficients and statistics for the 488 regression models used to estimate streamwater constituent loads for 13 watersheds in Gwinnett County, Georgia for two calibration periods, water years 2003-2010 and 2010-2020. Model terms were selected from an 11-parameter equation, which was a function of discharge, base flow, season, turbidity, and time (trend), using a forward stepwise ordinary least squares regression approach. Model coefficients were fit using U.S. Geological Survey (USGS) LOADEST load estimation software. Models were fit both with and without turbidity explanatory variables for 12 water-quality constituents: total suspended solids, suspended sediment concentration, total nitrogen, total nitrate [...]

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13_GwinnettCoGa_LOADESTModelOutput.zip
“Gwinnett County LOADEST model coefficients statistics data”
112.26 MB application/zip
13_GwinnettCoGa_LOADESTModels.csv
“Gwinnett County LOADEST model calibration data”
139.99 KB text/csv

Purpose

The purpose of this dataset is to make assessable load estimation model coefficients, summary statistics, and USGS LOADEST load estimation software output containing model diagnostic statistics and plots for evaluating model fits. These models were used in estimating streamwater constituent loads in support of the USGS Scientific Investigations Report "Hydrology, water-quality, and watershed characteristics in 15 watersheds in Gwinnett County, Georgia, 2002-20". This study is part of a long-term program to monitor and analyze the hydrologic and water-quality conditions of 15 watersheds in Gwinnett County, Georgia by the USGS in cooperation with Gwinnett County Department of Water Resources.

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