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Silvia Terziotti (Former Employee)

Science and Products

Indicators of Hydrologic Alteration in North Carolina Catchments: Small Ponds and Artificial Drainage Indicators of Hydrologic Alteration in North Carolina Catchments: Small Ponds and Artificial Drainage

Alterations to stream hydrology, which include changes in stream geomorphology, are primary impacts of anthropogenic disruption. In North Carolina, hydrological alterations lead to environmental impacts through degraded ecosystems and water quality. In collaboration with the North Carolina Department of Environmental Quality, Division of Mitigation Services (DMS), the USGS South Atlantic...
By
South Atlantic Water Science Center (SAWSC)

Nitrogen sources to and export from the Chesapeake Bay watershed, 1950 to 2050 Nitrogen sources to and export from the Chesapeake Bay watershed, 1950 to 2050

This U.S. Geological Survey data release contains datasets that combine past data with future projections of nitrogen sources and nitrogen export to the Chesapeake Bay watershed for the years 1950-2050. To help understand the effect of human and environmental changes over this time period, data for nitrogen sources from wastewater, agricultural fertilizer and manure, and atmospheric...
By
Water Resources Mission Area, Chesapeake Bay Activities, New Jersey Water Science Center

Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed, 1950-2050 Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed, 1950-2050

Reactive nitrogen is transported from the atmosphere to the landscape as wet and dry deposition that contributes to annual nitrogen loads to the Chesapeake Bay. Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed during 1950 to 2050 are presented, and are based on field measurements, model simulations, statistical relations, and surrogate constituents...
By
Chesapeake Bay Activities, New Jersey Water Science Center

Input and results from a boosted regression tree (BRT) model relating base flow nitrate concentrations in the Chesapeake Bay watershed to catchment characteristics (1970-2013) Input and results from a boosted regression tree (BRT) model relating base flow nitrate concentrations in the Chesapeake Bay watershed to catchment characteristics (1970-2013)

This data release contains a boosted regression tree (BRT) model (written in the R programming language), and the input and output data from that model that were used to relate base flow nitrate concentrations in the Chesapeake Bay watershed to catchment characteristics. The input data consists of two types of information: 1) surface water nitrate concentrations collected by the USGS and...
By
Chesapeake Bay Activities, Oregon Water Science Center

Indicators of Hydrologic Alteration in North Carolina Catchments Indicators of Hydrologic Alteration in North Carolina Catchments

Alterations to stream hydrology, which includes changes in stream geomorphology, are primary impacts of anthropogenic disruption. In North Carolina, hydrological alterations lead to environmental impacts through degraded ecosystems and water quality. In collaboration with the North Carolina Department of Environmental Quality, Division of Mitigation Services (DMS), the USGS South...
By
South Atlantic Water Science Center (SAWSC)

Dataset of SPARROW model input and predictions for total nitrogen and total phosphorus in North Carolina Dataset of SPARROW model input and predictions for total nitrogen and total phosphorus in North Carolina

To better understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On Watershed attributes) (Schwarz and others, 2006; Alexander and others, 2008) model. The framework is used to relate water-quality monitoring data to sources and watershed characteristics that...
By
South Atlantic Water Science Center (SAWSC)

SPARROW model dataset for total suspended solids in North Carolina, including simulated stream loads SPARROW model dataset for total suspended solids in North Carolina, including simulated stream loads

To better understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On Watershed attributes) (Schwarz and others, 2006; Alexander and others, 2008) model. The framework is used to relate water-quality monitoring data to sources and watershed characteristics that...
By
South Atlantic Water Science Center (SAWSC)

Geomorphological Features of North Carolina Geomorphological Features of North Carolina

Three statewide datasets were compiled to provide information on the geomorphology for North Carolina. Geomorphology is commonly a missing element in many Earth-surface process models, thus it is essential to extract this missing information from available DEMs and use it to inform models and better understand the area of interest. For these threee datasets, information was extracted and...
By
South Atlantic Water Science Center (SAWSC)

Datasets and metadata for estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology Datasets and metadata for estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

This USGS data release contains datasets, metadata, and figures associated with estimating nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology. There are three shapefiles with associated metadata and figures representing the shapefiles: Catchments_GWcontribN.shp: NHDPlus catchment estimates of groundwater contribution of...
By
Water Resources Mission Area, National Water Quality Program, Chesapeake Bay Activities, New Jersey Water Science Center

Source and model output layers used for the prediction and display of the probability of elevated concentrations of redox-sensitive constituents in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan Source and model output layers used for the prediction and display of the probability of elevated concentrations of redox-sensitive constituents in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan

This USGS data release contains 1-kilometer resolution source-layer rasters used to predict redox conditions and contaminant concentrations in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan using random forest classification. The model output layers are 1-kilometer resolution rasters of the predicted probability of elevated concentrations of nitrate, iron, and...
By
Water Resources Mission Area, National Water Quality Program

Depth to 50 percent probability of oxic conditions, Chesapeake Bay Watershed Depth to 50 percent probability of oxic conditions, Chesapeake Bay Watershed

Defining the oxic-suboxic interface is often critical for determining pathways for nitrate transport in groundwater and to streams at the local scale. Defining this interface on a regional scale is complicated by the spatial variability of reaction rates. The probability of oxic groundwater in the Chesapeake Bay watershed was predicted by relating dissolved O2 concentrations in...
By
Water Resources Mission Area, National Water Quality Program, Chesapeake Bay Activities

Data on annual total nitrogen loads and watershed characteristics used to develop a method to estimate the total nitrogen loads in small streams Data on annual total nitrogen loads and watershed characteristics used to develop a method to estimate the total nitrogen loads in small streams

This USGS Data Release represents the data used to develop multiple linear regression models for estimating the loads of total nitrogen in small streams. Recursive partitioning and random forest regression were used to assess 85 geospatial, environmental, and watershed variables across 636 small (less than 585 square kilometers) watersheds to determine which variables are fundamentally...
By
New Jersey Water Science Center

Mapping watershed potential to contribute phosphorus from geologic materials to receiving streams, southeastern United States Mapping watershed potential to contribute phosphorus from geologic materials to receiving streams, southeastern United States

As part of the southeastern United States SPARROW (SPAtially Referenced Regressions On Watershed attributes) water-quality model implementation, the U.S. Geological Survey created a dataset to characterize the contribution of phosphorus to streams from weathering and erosion of surficial geologic materials. SPARROW provides estimates of total nitrogen and phosphorus loads in surface...
By
Water Resources Mission Area, South Atlantic Water Science Center (SAWSC)
January 28 2025 Hydrography Community Call Thumbnail January 28 2025 Hydrography Community Call Thumbnail
January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”
January 28 2025 Hydrography Community Call Thumbnail

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

Steve Aichele, the National Geospatial Program Hydrography Management and Planning Lead, announced release of updated Elevation Derived Hydrography Specifications and publication of the following products and services: 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
January 28 2025 Hydrography Community Call Thumbnail

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

Steve Aichele, the National Geospatial Program Hydrography Management and Planning Lead, announced release of updated Elevation Derived Hydrography Specifications and publication of the following products and services: 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

The 3D Hydrography Program (3DHP) database will initially be populated with the National Hydrography Dataset (NHD) features, mapped to the new data model. The NHD-source features will be replaced with hydrography derived from the 3D Elevation Program (3DEP) lidar and IfSAR data as it becomes available.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Hydrography
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

The 3D Hydrography Program (3DHP) database will initially be populated with the National Hydrography Dataset (NHD) features, mapped to the new data model. The NHD-source features will be replaced with hydrography derived from the 3D Elevation Program (3DEP) lidar and IfSAR data as it becomes available.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Hydrography
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

Federal Fiscal Year 2024 was the first full operational year for the 3D Hydrography Program. We made significant progress in a number of areas, publishing final versions of legacy products, and developing processes for the new program. This presentation will provide an overview of what was accomplished in FY24 and what is planned for FY25. 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

Federal Fiscal Year 2024 was the first full operational year for the 3D Hydrography Program. We made significant progress in a number of areas, publishing final versions of legacy products, and developing processes for the new program. This presentation will provide an overview of what was accomplished in FY24 and what is planned for FY25. 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
USACE Hunting Use of USGS Data and Services Thumbnail USACE Hunting Use of USGS Data and Services Thumbnail
USACE Huntington Use of USGS Data and Services
USACE Hunting Use of USGS Data and Services Thumbnail

USACE Huntington Use of USGS Data and Services

USACE Huntington Use of USGS Data and Services

The US Army Corps of Engineers (USACE) office in Huntington, WV provides a number of floodplain management services. These include base flood elevation (BFE) evaluations, watershed modeling, project planning, and responding to numerous technical questions.

By
Core Science Systems Mission Area, National Geospatial Program, National Geospatial Program, 3D Elevation Program, 3D Hydrography Program
USACE Hunting Use of USGS Data and Services Thumbnail

USACE Huntington Use of USGS Data and Services

USACE Huntington Use of USGS Data and Services

The US Army Corps of Engineers (USACE) office in Huntington, WV provides a number of floodplain management services. These include base flood elevation (BFE) evaluations, watershed modeling, project planning, and responding to numerous technical questions.

By
Core Science Systems Mission Area, National Geospatial Program, National Geospatial Program, 3D Elevation Program, 3D Hydrography Program
Elevation-Derived Hydrography READ Rules 2022 rev. A Elevation-Derived Hydrography READ Rules 2022 rev. A
Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2022 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 
 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2022 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 
 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2021 rev. A Elevation-Derived Hydrography READ Rules 2021 rev. A
Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2021 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2021 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2020 rev. A Elevation-Derived Hydrography READ Rules 2020 rev. A
Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2020 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 

By
Core Science Systems Mission Area, National Geospatial Program
Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2020 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 

By
Core Science Systems Mission Area, National Geospatial Program
A map with elevation showing an indefinite surface connector.
Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector
Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector
A map with elevation showing an indefinite surface connector.

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Example of indefinite surface connector features providing network connectivity through an area without clear channelization.

By
NGP Standards and Specifications
A map with elevation showing an indefinite surface connector.

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Example of indefinite surface connector features providing network connectivity through an area without clear channelization.

By
NGP Standards and Specifications
Filter Total Items: 36

Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050 Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050

ForewordSustaining the quality of the Nation’s water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken together, these actions lead to immediate and...
Authors
John Clune, Paul Capel, Matthew Miller, Douglas Burns, Andrew Sekellick, Peter Claggett, Richard Coupe, Rosemary Fanelli, Ana Maria Garcia, Jeff Raffensperger, Silvia Terziotti, Gopal Bhatt, Joel Blomquist, Kristina Hopkins, Jennifer Keisman, Lewis Linker, Gary Shenk, Richard Smith, Alexander Soroka, James Webber, David Wolock, Qian Zhang
By
Water Resources Mission Area, Chesapeake Bay Activities, Maryland-Delaware-D.C. Water Science Center, New York Water Science Center, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC), Utah Water Science Center, Virginia and West Virginia Water Science Center

Factors affecting nitrate concentrations in stream base flow Factors affecting nitrate concentrations in stream base flow

Elevated nitrogen concentrations in streams and rivers in the Chesapeake Bay watershed have adversely affected the ecosystem health of the bay. Much of this nitrogen is derived as nitrate from groundwater that discharges to streams as base flow. In this study, boosted regression trees (BRTs) were used to relate nitrate concentrations in base flow (n = 156) to explanatory variables...
Authors
Susan Wherry, Anthony Tesoriero, Silvia Terziotti
By
Water Resources Mission Area, Chesapeake Bay Activities, Oregon Water Science Center

Elevation-derived hydrography acquisition specifications Elevation-derived hydrography acquisition specifications

Hydrographic features derived from U.S. Geological Survey (USGS) 3D Elevation Program data, and collected for use by the USGS, must meet the specifications described in this document. The specifications described herein pertain to the final product delivered to the USGS, not to methods used to derive the hydrographic features. The specifications describe the collection area, spatial...
Authors
Silvia Terziotti, Christy-Ann Archuleta
By
Core Science Systems Mission Area, National Geospatial Program, South Atlantic Water Science Center (SAWSC), 3D Hydrography Program, 3D National Topography Model, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications

Elevation-derived hydrography—Representation, extraction, attribution, and delineation rules Elevation-derived hydrography—Representation, extraction, attribution, and delineation rules

With the increasing availability of 3D Elevation Program (3DEP) quality high resolution elevation data across the United States and the pressing need for better integrated elevation and hydrography data, the U.S. Geological Survey is developing guidance to improve the horizontal and vertical alignment of these datasets. The U.S. Geological Survey is providing the Elevation-Derived...
Authors
Christy-Ann Archuleta, Silvia Terziotti
By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, 3D National Topography Model, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications

Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

The water quality of the Chesapeake Bay may be adversely affected by dissolved nitrate carried in groundwater discharge to streams. To estimate the concentrations, loads, and yields of nitrate from groundwater to streams for the Chesapeake Bay watershed, a regression model was developed based on measured nitrate concentrations from 156 small streams with watersheds less than 500 square...
Authors
Silvia Terziotti, Paul Capel, Anthony Tesoriero, Jessica Hopple, Scott Kronholm
By
Water Resources Mission Area, Chesapeake Bay Activities, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC)

Estimating discharge and nonpoint source nitrate loading to streams from three end‐member pathways using high‐frequency water quality data Estimating discharge and nonpoint source nitrate loading to streams from three end‐member pathways using high‐frequency water quality data

The myriad hydrologic and biogeochemical processes taking place in watersheds occurring across space and time are integrated and reflected in the quantity and quality of water in streams and rivers. Collection of high‐frequency water quality data with sensors in surface waters provides new opportunities to disentangle these processes and quantify sources and transport of water and...
Authors
Matthew Miller, Anthony Tesoriero, Krista Hood, Silvia Terziotti, David Wolock
By
Water Resources Mission Area, National Water Quality Program, Central Plains Water Science Center, Oregon Water Science Center, South Atlantic Water Science Center (SAWSC), Kansas Water Science Center, Utah Water Science Center

Statistically extracted fundamental watershed variables for estimating the loads of total nitrogen in small streams Statistically extracted fundamental watershed variables for estimating the loads of total nitrogen in small streams

Accurate estimation of total nitrogen loads is essential for evaluating conditions in the aquatic environment. Extrapolation of estimates beyond measured streams will greatly expand our understanding of total nitrogen loading to streams. Recursive partitioning and random forest regression were used to assess 85 geospatial, environmental, and watershed variables across 636 small (
Authors
Scott Kronholm, Paul Capel, Silvia Terziotti
By
Water Resources Mission Area

Predicting redox conditions in groundwater at a regional scale Predicting redox conditions in groundwater at a regional scale

Defining the oxic-suboxic interface is often critical for determining pathways for nitrate transport in groundwater and to streams at the local scale. Defining this interface on a regional scale is complicated by the spatial variability of reaction rates. The probability of oxic groundwater in the Chesapeake Bay watershed was predicted by relating dissolved O2 concentrations in...
Authors
Anthony J. Tesoriero, Silvia Terziotti, Daniel Abrams
By
Water Resources Mission Area, Oregon Water Science Center

A semi-automated tool for reducing the creation of false closed depressions from a filled LIDAR-derived digital elevation model A semi-automated tool for reducing the creation of false closed depressions from a filled LIDAR-derived digital elevation model

Closed depressions on the land surface can be identified by ‘filling’ a digital elevation model (DEM) and subtracting the filled model from the original DEM. However, automated methods suffer from artificial ‘dams’ where surface streams cross under bridges and through culverts. Removal of these false depressions from an elevation model is difficult due to the lack of bridge and culvert...
Authors
John Wall, Daniel Doctor, Silvia Terziotti
By
Florence Bascom Geoscience Center

Simulating stream transport of nutrients in the eastern United States, 2002, using a spatially-referenced regression model and 1:100,000-scale hydrography Simulating stream transport of nutrients in the eastern United States, 2002, using a spatially-referenced regression model and 1:100,000-scale hydrography

Existing Spatially Referenced Regression on Watershed attributes (SPARROW) nutrient models for the northeastern and southeastern regions of the United States were recalibrated to achieve a hydrographically consistent model with which to assess nutrient sources and stream transport and investigate specific management questions about the effects of wetlands and atmospheric deposition on...
Authors
Anne Hoos, Richard Moore, Ana Maria Garcia, Gregory B. Noe, Silvia E. Terziotti, Craig Johnston, Robin Dennis
By
Water Resources Mission Area, Lower Mississippi-Gulf Water Science Center, USGS Science in Long Island Sound and its Watershed

Relation of watershed setting and stream nutrient yields at selected sites in central and eastern North Carolina, 1997-2008 Relation of watershed setting and stream nutrient yields at selected sites in central and eastern North Carolina, 1997-2008

Data collected between 1997 and 2008 at 48 stream sites were used to characterize relations between watershed settings and stream nutrient yields throughout central and eastern North Carolina. The focus of the investigation was to identify environmental variables in watersheds that influence nutrient export for supporting the development and prioritization of management strategies for...
Authors
Stephen Harden, Thomas Cuffney, Silvia Terziotti, Katharine Kolb
By
Water Resources Mission Area, South Atlantic Water Science Center (SAWSC)

Representation of regional urban development conditions using a watershed-based gradient study design Representation of regional urban development conditions using a watershed-based gradient study design

As part of the U.S. Geological Survey National Water-Quality Assessment Program, the effects of urbanization on stream ecosystems (EUSE) have been intensively investigated in nine metropolitan areas in the United States, including Boston, Massachusetts; Atlanta, Georgia; Birmingham, Alabama; Raleigh, North Carolina; Salt Lake City, Utah; Denver, Colorado; Dallas–Fort Worth, Texas...
Authors
Silvia Terziotti, Gerard McMahon, Amanda Bell
By
Water Resources Mission Area, South Atlantic Water Science Center (SAWSC)

Science and Products

Indicators of Hydrologic Alteration in North Carolina Catchments: Small Ponds and Artificial Drainage Indicators of Hydrologic Alteration in North Carolina Catchments: Small Ponds and Artificial Drainage

Alterations to stream hydrology, which include changes in stream geomorphology, are primary impacts of anthropogenic disruption. In North Carolina, hydrological alterations lead to environmental impacts through degraded ecosystems and water quality. In collaboration with the North Carolina Department of Environmental Quality, Division of Mitigation Services (DMS), the USGS South Atlantic...
By
South Atlantic Water Science Center (SAWSC)

Nitrogen sources to and export from the Chesapeake Bay watershed, 1950 to 2050 Nitrogen sources to and export from the Chesapeake Bay watershed, 1950 to 2050

This U.S. Geological Survey data release contains datasets that combine past data with future projections of nitrogen sources and nitrogen export to the Chesapeake Bay watershed for the years 1950-2050. To help understand the effect of human and environmental changes over this time period, data for nitrogen sources from wastewater, agricultural fertilizer and manure, and atmospheric...
By
Water Resources Mission Area, Chesapeake Bay Activities, New Jersey Water Science Center

Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed, 1950-2050 Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed, 1950-2050

Reactive nitrogen is transported from the atmosphere to the landscape as wet and dry deposition that contributes to annual nitrogen loads to the Chesapeake Bay. Estimates of atmospheric inorganic nitrogen deposition to the Chesapeake Bay watershed during 1950 to 2050 are presented, and are based on field measurements, model simulations, statistical relations, and surrogate constituents...
By
Chesapeake Bay Activities, New Jersey Water Science Center

Input and results from a boosted regression tree (BRT) model relating base flow nitrate concentrations in the Chesapeake Bay watershed to catchment characteristics (1970-2013) Input and results from a boosted regression tree (BRT) model relating base flow nitrate concentrations in the Chesapeake Bay watershed to catchment characteristics (1970-2013)

This data release contains a boosted regression tree (BRT) model (written in the R programming language), and the input and output data from that model that were used to relate base flow nitrate concentrations in the Chesapeake Bay watershed to catchment characteristics. The input data consists of two types of information: 1) surface water nitrate concentrations collected by the USGS and...
By
Chesapeake Bay Activities, Oregon Water Science Center

Indicators of Hydrologic Alteration in North Carolina Catchments Indicators of Hydrologic Alteration in North Carolina Catchments

Alterations to stream hydrology, which includes changes in stream geomorphology, are primary impacts of anthropogenic disruption. In North Carolina, hydrological alterations lead to environmental impacts through degraded ecosystems and water quality. In collaboration with the North Carolina Department of Environmental Quality, Division of Mitigation Services (DMS), the USGS South...
By
South Atlantic Water Science Center (SAWSC)

Dataset of SPARROW model input and predictions for total nitrogen and total phosphorus in North Carolina Dataset of SPARROW model input and predictions for total nitrogen and total phosphorus in North Carolina

To better understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On Watershed attributes) (Schwarz and others, 2006; Alexander and others, 2008) model. The framework is used to relate water-quality monitoring data to sources and watershed characteristics that...
By
South Atlantic Water Science Center (SAWSC)

SPARROW model dataset for total suspended solids in North Carolina, including simulated stream loads SPARROW model dataset for total suspended solids in North Carolina, including simulated stream loads

To better understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On Watershed attributes) (Schwarz and others, 2006; Alexander and others, 2008) model. The framework is used to relate water-quality monitoring data to sources and watershed characteristics that...
By
South Atlantic Water Science Center (SAWSC)

Geomorphological Features of North Carolina Geomorphological Features of North Carolina

Three statewide datasets were compiled to provide information on the geomorphology for North Carolina. Geomorphology is commonly a missing element in many Earth-surface process models, thus it is essential to extract this missing information from available DEMs and use it to inform models and better understand the area of interest. For these threee datasets, information was extracted and...
By
South Atlantic Water Science Center (SAWSC)

Datasets and metadata for estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology Datasets and metadata for estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

This USGS data release contains datasets, metadata, and figures associated with estimating nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology. There are three shapefiles with associated metadata and figures representing the shapefiles: Catchments_GWcontribN.shp: NHDPlus catchment estimates of groundwater contribution of...
By
Water Resources Mission Area, National Water Quality Program, Chesapeake Bay Activities, New Jersey Water Science Center

Source and model output layers used for the prediction and display of the probability of elevated concentrations of redox-sensitive constituents in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan Source and model output layers used for the prediction and display of the probability of elevated concentrations of redox-sensitive constituents in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan

This USGS data release contains 1-kilometer resolution source-layer rasters used to predict redox conditions and contaminant concentrations in groundwater in the Fox-Wolf-Peshtigo watershed in Wisconsin and Michigan using random forest classification. The model output layers are 1-kilometer resolution rasters of the predicted probability of elevated concentrations of nitrate, iron, and...
By
Water Resources Mission Area, National Water Quality Program

Depth to 50 percent probability of oxic conditions, Chesapeake Bay Watershed Depth to 50 percent probability of oxic conditions, Chesapeake Bay Watershed

Defining the oxic-suboxic interface is often critical for determining pathways for nitrate transport in groundwater and to streams at the local scale. Defining this interface on a regional scale is complicated by the spatial variability of reaction rates. The probability of oxic groundwater in the Chesapeake Bay watershed was predicted by relating dissolved O2 concentrations in...
By
Water Resources Mission Area, National Water Quality Program, Chesapeake Bay Activities

Data on annual total nitrogen loads and watershed characteristics used to develop a method to estimate the total nitrogen loads in small streams Data on annual total nitrogen loads and watershed characteristics used to develop a method to estimate the total nitrogen loads in small streams

This USGS Data Release represents the data used to develop multiple linear regression models for estimating the loads of total nitrogen in small streams. Recursive partitioning and random forest regression were used to assess 85 geospatial, environmental, and watershed variables across 636 small (less than 585 square kilometers) watersheds to determine which variables are fundamentally...
By
New Jersey Water Science Center

Mapping watershed potential to contribute phosphorus from geologic materials to receiving streams, southeastern United States Mapping watershed potential to contribute phosphorus from geologic materials to receiving streams, southeastern United States

As part of the southeastern United States SPARROW (SPAtially Referenced Regressions On Watershed attributes) water-quality model implementation, the U.S. Geological Survey created a dataset to characterize the contribution of phosphorus to streams from weathering and erosion of surficial geologic materials. SPARROW provides estimates of total nitrogen and phosphorus loads in surface...
By
Water Resources Mission Area, South Atlantic Water Science Center (SAWSC)
January 28 2025 Hydrography Community Call Thumbnail January 28 2025 Hydrography Community Call Thumbnail
January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”
January 28 2025 Hydrography Community Call Thumbnail

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

Steve Aichele, the National Geospatial Program Hydrography Management and Planning Lead, announced release of updated Elevation Derived Hydrography Specifications and publication of the following products and services: 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
January 28 2025 Hydrography Community Call Thumbnail

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

January 28, 2025 USGS Hydrography Community Call: 3D Hydrography Program Announcements and “HydroAdd3D Sneak Peak”

Steve Aichele, the National Geospatial Program Hydrography Management and Planning Lead, announced release of updated Elevation Derived Hydrography Specifications and publication of the following products and services: 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

The 3D Hydrography Program (3DHP) database will initially be populated with the National Hydrography Dataset (NHD) features, mapped to the new data model. The NHD-source features will be replaced with hydrography derived from the 3D Elevation Program (3DEP) lidar and IfSAR data as it becomes available.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Hydrography
December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data Thumbnail

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

December 2024 USGS Hydrography Community Call: Delivering and Using 3D Hydrography Program (3DHP) Data

The 3D Hydrography Program (3DHP) database will initially be populated with the National Hydrography Dataset (NHD) features, mapped to the new data model. The NHD-source features will be replaced with hydrography derived from the 3D Elevation Program (3DEP) lidar and IfSAR data as it becomes available.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Hydrography
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

Federal Fiscal Year 2024 was the first full operational year for the 3D Hydrography Program. We made significant progress in a number of areas, publishing final versions of legacy products, and developing processes for the new program. This presentation will provide an overview of what was accomplished in FY24 and what is planned for FY25. 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25? thumbnail

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

The 3D Hydrography Program at one year – what was accomplished in FY24, what is planned for FY25?

Federal Fiscal Year 2024 was the first full operational year for the 3D Hydrography Program. We made significant progress in a number of areas, publishing final versions of legacy products, and developing processes for the new program. This presentation will provide an overview of what was accomplished in FY24 and what is planned for FY25. 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program
USACE Hunting Use of USGS Data and Services Thumbnail USACE Hunting Use of USGS Data and Services Thumbnail
USACE Huntington Use of USGS Data and Services
USACE Hunting Use of USGS Data and Services Thumbnail

USACE Huntington Use of USGS Data and Services

USACE Huntington Use of USGS Data and Services

The US Army Corps of Engineers (USACE) office in Huntington, WV provides a number of floodplain management services. These include base flood elevation (BFE) evaluations, watershed modeling, project planning, and responding to numerous technical questions.

By
Core Science Systems Mission Area, National Geospatial Program, National Geospatial Program, 3D Elevation Program, 3D Hydrography Program
USACE Hunting Use of USGS Data and Services Thumbnail

USACE Huntington Use of USGS Data and Services

USACE Huntington Use of USGS Data and Services

The US Army Corps of Engineers (USACE) office in Huntington, WV provides a number of floodplain management services. These include base flood elevation (BFE) evaluations, watershed modeling, project planning, and responding to numerous technical questions.

By
Core Science Systems Mission Area, National Geospatial Program, National Geospatial Program, 3D Elevation Program, 3D Hydrography Program
Elevation-Derived Hydrography READ Rules 2022 rev. A Elevation-Derived Hydrography READ Rules 2022 rev. A
Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2022 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 
 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

Elevation-Derived Hydrography READ Rules 2022 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2022 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 
 

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2021 rev. A Elevation-Derived Hydrography READ Rules 2021 rev. A
Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2021 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

Elevation-Derived Hydrography READ Rules 2021 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2021 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data.

By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications
Elevation-Derived Hydrography READ Rules 2020 rev. A Elevation-Derived Hydrography READ Rules 2020 rev. A
Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2020 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 

By
Core Science Systems Mission Area, National Geospatial Program
Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

Elevation-Derived Hydrography READ Rules 2020 rev. A

This document is the Elevation-Derived Hydrography Representation, Extraction, Attribution, and Delineation Rules (READ) Rules 2020 rev. A. It provides information on how to create Elevation-Derived Hydrography features from 3D Elevation Program (3DEP) data. 

By
Core Science Systems Mission Area, National Geospatial Program
A map with elevation showing an indefinite surface connector.
Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector
Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector
A map with elevation showing an indefinite surface connector.

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Example of indefinite surface connector features providing network connectivity through an area without clear channelization.

By
NGP Standards and Specifications
A map with elevation showing an indefinite surface connector.

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Elevation-Derived Hydrography READ Rules: Indefinite Surface Connector

Example of indefinite surface connector features providing network connectivity through an area without clear channelization.

By
NGP Standards and Specifications
Filter Total Items: 36

Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050 Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050

ForewordSustaining the quality of the Nation’s water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken together, these actions lead to immediate and...
Authors
John Clune, Paul Capel, Matthew Miller, Douglas Burns, Andrew Sekellick, Peter Claggett, Richard Coupe, Rosemary Fanelli, Ana Maria Garcia, Jeff Raffensperger, Silvia Terziotti, Gopal Bhatt, Joel Blomquist, Kristina Hopkins, Jennifer Keisman, Lewis Linker, Gary Shenk, Richard Smith, Alexander Soroka, James Webber, David Wolock, Qian Zhang
By
Water Resources Mission Area, Chesapeake Bay Activities, Maryland-Delaware-D.C. Water Science Center, New York Water Science Center, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC), Utah Water Science Center, Virginia and West Virginia Water Science Center

Factors affecting nitrate concentrations in stream base flow Factors affecting nitrate concentrations in stream base flow

Elevated nitrogen concentrations in streams and rivers in the Chesapeake Bay watershed have adversely affected the ecosystem health of the bay. Much of this nitrogen is derived as nitrate from groundwater that discharges to streams as base flow. In this study, boosted regression trees (BRTs) were used to relate nitrate concentrations in base flow (n = 156) to explanatory variables...
Authors
Susan Wherry, Anthony Tesoriero, Silvia Terziotti
By
Water Resources Mission Area, Chesapeake Bay Activities, Oregon Water Science Center

Elevation-derived hydrography acquisition specifications Elevation-derived hydrography acquisition specifications

Hydrographic features derived from U.S. Geological Survey (USGS) 3D Elevation Program data, and collected for use by the USGS, must meet the specifications described in this document. The specifications described herein pertain to the final product delivered to the USGS, not to methods used to derive the hydrographic features. The specifications describe the collection area, spatial...
Authors
Silvia Terziotti, Christy-Ann Archuleta
By
Core Science Systems Mission Area, National Geospatial Program, South Atlantic Water Science Center (SAWSC), 3D Hydrography Program, 3D National Topography Model, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications

Elevation-derived hydrography—Representation, extraction, attribution, and delineation rules Elevation-derived hydrography—Representation, extraction, attribution, and delineation rules

With the increasing availability of 3D Elevation Program (3DEP) quality high resolution elevation data across the United States and the pressing need for better integrated elevation and hydrography data, the U.S. Geological Survey is developing guidance to improve the horizontal and vertical alignment of these datasets. The U.S. Geological Survey is providing the Elevation-Derived...
Authors
Christy-Ann Archuleta, Silvia Terziotti
By
Core Science Systems Mission Area, National Geospatial Program, 3D Hydrography Program, 3D National Topography Model, National Geospatial Technical Operations Center, National Hydrography, NGP Standards and Specifications

Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

The water quality of the Chesapeake Bay may be adversely affected by dissolved nitrate carried in groundwater discharge to streams. To estimate the concentrations, loads, and yields of nitrate from groundwater to streams for the Chesapeake Bay watershed, a regression model was developed based on measured nitrate concentrations from 156 small streams with watersheds less than 500 square...
Authors
Silvia Terziotti, Paul Capel, Anthony Tesoriero, Jessica Hopple, Scott Kronholm
By
Water Resources Mission Area, Chesapeake Bay Activities, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC)

Estimating discharge and nonpoint source nitrate loading to streams from three end‐member pathways using high‐frequency water quality data Estimating discharge and nonpoint source nitrate loading to streams from three end‐member pathways using high‐frequency water quality data

The myriad hydrologic and biogeochemical processes taking place in watersheds occurring across space and time are integrated and reflected in the quantity and quality of water in streams and rivers. Collection of high‐frequency water quality data with sensors in surface waters provides new opportunities to disentangle these processes and quantify sources and transport of water and...
Authors
Matthew Miller, Anthony Tesoriero, Krista Hood, Silvia Terziotti, David Wolock
By
Water Resources Mission Area, National Water Quality Program, Central Plains Water Science Center, Oregon Water Science Center, South Atlantic Water Science Center (SAWSC), Kansas Water Science Center, Utah Water Science Center

Statistically extracted fundamental watershed variables for estimating the loads of total nitrogen in small streams Statistically extracted fundamental watershed variables for estimating the loads of total nitrogen in small streams

Accurate estimation of total nitrogen loads is essential for evaluating conditions in the aquatic environment. Extrapolation of estimates beyond measured streams will greatly expand our understanding of total nitrogen loading to streams. Recursive partitioning and random forest regression were used to assess 85 geospatial, environmental, and watershed variables across 636 small (
Authors
Scott Kronholm, Paul Capel, Silvia Terziotti
By
Water Resources Mission Area

Predicting redox conditions in groundwater at a regional scale Predicting redox conditions in groundwater at a regional scale

Defining the oxic-suboxic interface is often critical for determining pathways for nitrate transport in groundwater and to streams at the local scale. Defining this interface on a regional scale is complicated by the spatial variability of reaction rates. The probability of oxic groundwater in the Chesapeake Bay watershed was predicted by relating dissolved O2 concentrations in...
Authors
Anthony J. Tesoriero, Silvia Terziotti, Daniel Abrams
By
Water Resources Mission Area, Oregon Water Science Center

A semi-automated tool for reducing the creation of false closed depressions from a filled LIDAR-derived digital elevation model A semi-automated tool for reducing the creation of false closed depressions from a filled LIDAR-derived digital elevation model

Closed depressions on the land surface can be identified by ‘filling’ a digital elevation model (DEM) and subtracting the filled model from the original DEM. However, automated methods suffer from artificial ‘dams’ where surface streams cross under bridges and through culverts. Removal of these false depressions from an elevation model is difficult due to the lack of bridge and culvert...
Authors
John Wall, Daniel Doctor, Silvia Terziotti
By
Florence Bascom Geoscience Center

Simulating stream transport of nutrients in the eastern United States, 2002, using a spatially-referenced regression model and 1:100,000-scale hydrography Simulating stream transport of nutrients in the eastern United States, 2002, using a spatially-referenced regression model and 1:100,000-scale hydrography

Existing Spatially Referenced Regression on Watershed attributes (SPARROW) nutrient models for the northeastern and southeastern regions of the United States were recalibrated to achieve a hydrographically consistent model with which to assess nutrient sources and stream transport and investigate specific management questions about the effects of wetlands and atmospheric deposition on...
Authors
Anne Hoos, Richard Moore, Ana Maria Garcia, Gregory B. Noe, Silvia E. Terziotti, Craig Johnston, Robin Dennis
By
Water Resources Mission Area, Lower Mississippi-Gulf Water Science Center, USGS Science in Long Island Sound and its Watershed

Relation of watershed setting and stream nutrient yields at selected sites in central and eastern North Carolina, 1997-2008 Relation of watershed setting and stream nutrient yields at selected sites in central and eastern North Carolina, 1997-2008

Data collected between 1997 and 2008 at 48 stream sites were used to characterize relations between watershed settings and stream nutrient yields throughout central and eastern North Carolina. The focus of the investigation was to identify environmental variables in watersheds that influence nutrient export for supporting the development and prioritization of management strategies for...
Authors
Stephen Harden, Thomas Cuffney, Silvia Terziotti, Katharine Kolb
By
Water Resources Mission Area, South Atlantic Water Science Center (SAWSC)

Representation of regional urban development conditions using a watershed-based gradient study design Representation of regional urban development conditions using a watershed-based gradient study design

As part of the U.S. Geological Survey National Water-Quality Assessment Program, the effects of urbanization on stream ecosystems (EUSE) have been intensively investigated in nine metropolitan areas in the United States, including Boston, Massachusetts; Atlanta, Georgia; Birmingham, Alabama; Raleigh, North Carolina; Salt Lake City, Utah; Denver, Colorado; Dallas–Fort Worth, Texas...
Authors
Silvia Terziotti, Gerard McMahon, Amanda Bell
By
Water Resources Mission Area, South Atlantic Water Science Center (SAWSC)
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