Filters: partyWithName: Jeffrey G Chanat (X)
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Includes the following files for the indicated years. Includes the following files for the indicated years. Atmospheric Deposition (atmdep) Biosolids CSO Direct Deposit Fertilizer Land Use Manure Nitrogen Fixation (nfix) Rapid Infiltration Basins (RIB) Septic Uptake Wastewater
Categories: Data
This data release documents spatiotemporal water-quality, landscape, and climatic conditions in Fairfax County, Virginia from 2007 through 2018. These data were used to evaluate the water-quality and ecological condition of 20 Fairfax County watersheds monitored since 2007. Data include measures of water-quality, precipitation, air temperature, land use, land cover, wastewater and stormwater infrastructure, soil properties, geologic setting, and stream networks. Annual values from 2007 through 2018 are reported for data expected to change over time. Watershed-specific values are reported for data that differ across the landscape. Annual values for the 20 study watersheds and Fairfax County are reported in the file...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Fairfax,
USGS Science Data Catalog (SDC),
Water Quality,
air temperature,
biota,
This data release contains one dataset and one model archive in support of the journal article, "Leveraging machine learning to automate regression model evaluations for large multi-site water-quality trend studies," by Jennifer C. Murphy and Jeffrey G. Chanat. The model archive contains scripts (run in R) to reproduce the four machine learning models (logistic regression, linear and quadratic discriminant analysis, and k-nearest neighbors) trained and tested as part of the journal article. The dataset contains the estimated probabilities for each of these models when applied to a training and test dataset.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Delaware River Basin,
USGS Science Data Catalog (SDC),
United States of America,
Water Quality,
biota,
Includes the following files for the indicated years. Includes the following files for the indicated years. Atmospheric Deposition (atmdep) Biosolids CSO Direct Deposit Fertilizer Land Use Manure Nitrogen Fixation (nfix) Rapid Infiltration Basins (RIB) Septic Uptake Wastewater
Categories: Data
Includes the following files for the indicated years. Includes the following files for the indicated years. Atmospheric Deposition (atmdep) Biosolids CSO Direct Deposit Fertilizer Land Use Manure Nitrogen Fixation (nfix) Rapid Infiltration Basins (RIB) Septic Uptake Wastewater
Categories: Data
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay Nontidal Network (NTN) stations for the period 1985 through 2014. Nutrient and suspended-sediment loads and changes in loads were determined by applying a weighted regression approach called WRTDS (Weighted Regression on Time, Discharge, and Season). The load results represent the total mass of nitrogen, phosphorus, and suspended sediment that was exported from each of the NTN watersheds. To determine the trend in loads, the annual load results are flow normalized to integrate out the year-to-year variability in river discharge....
Categories: Data;
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Chesapeake Bay Watershed,
USGS Science Data Catalog (SDC),
Water Quality,
load analysis,
nitrogen,
Includes the following files for the indicated years. Includes the following files for the indicated years. Atmospheric Deposition (atmdep) Biosolids CSO Direct Deposit Fertilizer Land Use Manure Nitrogen Fixation (nfix) Rapid Infiltration Basins (RIB) Septic Uptake Wastewater
Categories: Data
The core equations of the SPARROW model (Schwarz and others, 2006) were implemented in differential form using the R programming language (R Core Team, 2017), as the basis of a tool for empirically relating a regional pattern of changes in constituent flux, over a multi-year period, to spatially referenced changes in explanatory variables over the same period. A pilot implementation was developed to explore factors influencing changes in flow-normalized flux of total nitrogen over the period 1990-2010 at 43 sites in the non-tidal Chesapeake Bay watershed. Model inputs, outputs, and code are included in this data release, and are described below.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Chesapeake Bay,
USGS Science Data Catalog (SDC),
nutrients
The hydrologic regime of rivers and streams is a major determinant of habitat quality for fish and aquatic invertebrates. Long-term streamflow data were compiled and multidecadal streamflow trends and ecological flow (EFlow) statistics were calculated in support of the United States Geological Survey (USGS) Chesapeake Bay Science Initiative toward understanding fish habitat and health in the Chesapeake Bay Watershed (CBWS). A dataset comprising all streamgages (n = 409) reporting daily means of streamflow within the CBWS and remaining active as of September 30, 2018 (the end of Water Year [WY] 2018), independent of streamgage installation date, was retrieved from the USGS National Water Information System (NWIS)....
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Chesapeake Bay Watershed,
Delaware,
EFlow,
EFlow statistics,
EGRET,
The detrimental effects of excess nutrients and sediment entering the Chesapeake Bay estuary from its watersheds have necessitated regulatory actions. Federally-mandated reductions are apportioned to bay jurisdictions based on the U.S. Environmental Protection Agency's Chesapeake Bay Time-Variable Watershed Model (CBPM). The Chesapeake Assessment Scenario Tool (CAST version CAST-19; cast.chesapeakebay.net; Chesapeake Bay Program, 2020) is a simplified, on-line version of the Phase 6 CBPM that simulates watershed nutrients delivery to the estuary using the original model's annual land-surface nutrient source and removal inputs and time-averaged climatological forecasting. Because it runs much faster than the CBPM,...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Atmospheric Deposition,
Biosolids,
Chesapeake,
Chesapeake Assessment and Scenario Tool (CAST),
Chesapeake Bay,
Includes the following files for the indicated years. Atmospheric Deposition (atmdep) Biosolids CSO Direct Deposit Fertilizer Land Use Manure Nitrogen Fixation (nfix) Rapid Infiltration Basins (RIB) Septic Uptake Wastewater
Categories: Data
Includes the following files for the indicated years. Includes the following files for the indicated years. Atmospheric Deposition (atmdep) Biosolids CSO Direct Deposit Fertilizer Land Use Manure Nitrogen Fixation (nfix) Rapid Infiltration Basins (RIB) Septic Uptake Wastewater
Categories: Data
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