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This community catalog serves the Oregon Water Science Center. Community public website: http://or.water.usgs.gov/. The Oregon Water Science Center provides reliable water data and interpretation of data to Federal, State, and local agencies, Tribes, and the public. Our data and study results are widely used to manage Oregon's water resources for the benefit of people and our environment.
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Trends in nutrient fluxes and streamflow for selected tributaries in the Lake Erie watershed were calculated using monitoring data at 10 locations. Trends in flow-normalized nutrient fluxes were determined by applying a weighted regression approach called WRTDS (Weighted Regression on Time, Discharge, and Season). Site information and streamflow and water-quality records are contained in 3 zipped files named as follows: INFO (site information), Daily (daily streamflow records), and Sample (water-quality records). The INFO, Daily (flow), and Sample files contain the input data, by water-quality parameter and by site as .csv files, used to run trend analyses. These files were generated by the R (version 3.1.2) software...
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This data set contains county-level estimates of nitrogen and phosphorus from fertilizer, for both farm and nonfarm uses, for the conterminous United States, for 1987 through 2012. State-level farm and nonfarm nitrogen and phosphorus were derived from the Association of American Plant Food Control Officials (AAPFCO) commercial fertilizer sales data. State estimates were then allocated to the county-level using fertilizer expenditure from the Census of Agriculture as county weights for farm fertilizer, and effective population density as county weights for nonfarm fertilizer. Data computations for 2007 - 2012 estimates are results of methods applied directly from Gronberg and Spahr, 2012. Data for 1987 - 2006 are...
1. To elucidate factors contributing to dissolved oxygen (DO) depletion in the Stockton Deep Water Ship Channel in the lower San Joaquin River, spatial and temporal changes in algae and nutrient concentrations were investigated in relation to flow regime under the semiarid climate conditions.2. Chlorophyll-a (chl-a) concentration and loads indicated that most algal biomass was generated by in-stream growth in the main stem of the river. The addition of algae from tributaries and drains was small (c.15% of total chl-a load), even though high concentrations of chl-a were measured in some source waters.3. Nitrate and soluble-reactive phosphorus (SRP) were available in excess as a nutrient source for algae. Although...
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Ecosystem services provided by floodplains include removal of nitrogen, phosphorus, and sediments, and sequestration of carbon. Effectiveness of floodplains in providing these services is dependent on the extent and location of connection between floodplain and river. Tributary loading of sediments, nitrogen and phosphorus to the Upper Mississippi River contribute to the development of river and coastal eutrophication as well as hypoxic conditions in the Gulf of Mexico. Recent research has shown that management of river connectivity of channels to floodplains is an effective mitigation strategy to remove nutrients, sediment, and carbon from river flows. The confluence of the Maquoketa and Mississippi Rivers is a...
map background search result map search result map Quantifying Ecosystem Processes in Support of River Restoration and Nutrient Reduction Effects of Increased River Floodplain Connectivity in the Maquoketa River Species data for Gulf Hypoxia Blueprint Water Quality Focus Areas data for Gulf Hypoxia Blueprint Habitat data for Gulf Hypoxia Blueprint Supplemental data for Gulf Hypoxia Blueprint County-Level Estimates of Nitrogen and Phosphorus from Commercial Fertilizer for the Conterminous United States, 1987-2012 Nutrient and streamflow model-input data Quantifying Ecosystem Processes in Support of River Restoration and Nutrient Reduction Effects of Increased River Floodplain Connectivity in the Maquoketa River Nutrient and streamflow model-input data Species data for Gulf Hypoxia Blueprint Water Quality Focus Areas data for Gulf Hypoxia Blueprint Habitat data for Gulf Hypoxia Blueprint Supplemental data for Gulf Hypoxia Blueprint County-Level Estimates of Nitrogen and Phosphorus from Commercial Fertilizer for the Conterminous United States, 1987-2012