Annual Nutrient Loads for Illinois Environmental Protection Agency Ambient Water Quality Monitoring Network Sites, Water Years 1976–2021
Description
This data release contains estimates of annual nitrogen and phosphorus loads, as well as those of other constituents, from sites in the Illinois Environmental Protection Agency (Illinois EPA) Ambient Water Quality Monitoring Network. The loads were estimated using Weighted Regressions on Time, Discharge, and Season with Kalman filtering (WRTDS-K) and existing discrete water-quality data and discharge data collected by Illinois EPA, the U.S. Geological Survey, and Illinois State Water Survey from water year 1976 to 2021 (Hirsch and others, 2015; Lee and others, 2019). All water-quality and discharge data used in this work are available from the Water Quality Portal and the National Water Information System database (U.S. Geological Survey, 2022).
The data release comprises a single comma-separated values (CSV) file containing annual loads, load uncertainty, and sample counts for each ambient monitoring site. Note that the 'site' column should be loaded as a string to avoid losing the leading zeros
Resources
| Name |
Format |
Description |
Link |
|
55 |
Landing page for access to the data |
https://doi.org/10.5066/P9JX8YVL |
|
55 |
The metadata original format |
https://data.usgs.gov/datacatalog/metadata/USGS.60abcec0d34ea221ce51e8a3.xml |
|
55 |
Landing page for access to the data |
https://doi.org/10.5066/P9MM6KU8 |
Tags
- usgs-60abcec0d34ea221ce51e8a3
- regression-analysis
- ambient-water-quality-monitoring-network
- nitrate
- nitrogen
- phosphorus
- water-quality
- weighted-regressions-on-time-discharge-and-season-with-kalman-filtering-wrtds-k