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Estimated Annual Recharge to the Edwards Aquifer in the San Antonio Area, by Stream Basin or Ungaged Area, 1934 - 2020 Estimated Annual Recharge to the Edwards Aquifer in the San Antonio Area, by Stream Basin or Ungaged Area, 1934 - 2020
The Edwards aquifer in south-central Texas is one of the most permeable and productive aquifers in the United States and is the major source of public water supply for Bexar, Comal, Hays, Medina, and Uvalde Counties. The Edwards aquifer also supplies large quantities of water to agriculture, business, and industry in the region. The major artesian springs of the Edwards aquifer provide...
2017 Zooplankton Data from Lake Huron (ver. 2.0, March 2026) 2017 Zooplankton Data from Lake Huron (ver. 2.0, March 2026)
This data release includes zooplankton data collected with a 64-micron mesh net from 9 transects in Lake Huron between April and August 2017. At each transect, data were collected at up to three sites, ranging in bottom depths from 18 to 82 m. The volume sampled at each site was estimated with a flowmeter. Micro- and macro- crustaceans were identified, enumerated, and measured using a...
Data from USGS National Water Quality Laboratory methods used to calculate and compare detection limits estimated using single- and multi-concentration spike-based and blank-based procedures Data from USGS National Water Quality Laboratory methods used to calculate and compare detection limits estimated using single- and multi-concentration spike-based and blank-based procedures
This dataset provides the expected and determined concentrations of selected inorganic and organic analytes for spiked reagent-water samples (calibration standards and limit of quantitation standards) that were used to calculate detection limits by using the United States Environmental Protection Agency's (USEPA) Method Detection Limit (MDL) version 1.11 or 2.0 procedures, ASTM...
Domoic acid and saxitoxin in seabirds from California and Rhode Island 2015-2017 Domoic acid and saxitoxin in seabirds from California and Rhode Island 2015-2017
As harmful algal blooms (HABs) increase in magnitude and duration worldwide, they are becoming an expanding threat to marine wildlife. Over the past decade, domoic acid (DA) and saxitoxin (STX) have been increasingly problematic bicoastally in the United States. We investigated pooled seabird mortality data from opportunistic sampling events between 2007-2018, across three states, to...
Water Quality Samples for USGS 11092450 LOS ANGELES R A SEPULVEDA DAM CA Water Quality Samples for USGS 11092450 LOS ANGELES R A SEPULVEDA DAM CA
Water-quality data collected for various parameters at USGS monitoring site 11092450 (Los Angeles River at Sepulveda Dam).
Modeled nutrient and sediment concentrations from major rivers in Illinois based on continuous monitoring from October 1, 2015, through September 30, 2020 Modeled nutrient and sediment concentrations from major rivers in Illinois based on continuous monitoring from October 1, 2015, through September 30, 2020
During water years 2016-2020, the U.S. Geological Survey, in cooperation with the Illinois Environmental Protection Agency, operated continuous monitoring stations on eight of the major rivers in Illinois to better quantify nutrient and sediment loadings from the State of Illinois to the Mississippi River. This data release presents estimates of daily nitrate, suspended sediment, and...