Data
USGS has been collecting hydrologic data in Long Island Sound and its watershed for decades. Collected data include surface-water discharge, continuous and discrete groundwater levels and water-quality sampling. The data are used for a variety of purposes related to the management of water resources in the basin. Explore data releases below.
Filter Total Items: 27
Supporting Datasets and R Code for Compound Flood Hazard Modeling in the New York - Long Island Sound Region Supporting Datasets and R Code for Compound Flood Hazard Modeling in the New York - Long Island Sound Region
This data release includes a shapefile of compound flood hazard scores and the associated input data, scripts, and a sample output file necessary for calculating rain-surge return period adjustments for Long Island Sound and its surrounding areas. The raw input data and imputation scripts are included in this data release and are located in the "Imputation and data compilation.zip"...
MODFLOW 6 Models Used to Simulate Groundwater Flow and Nitrogen Transport in the Long Island Sound Watershed on Long Island, New York MODFLOW 6 Models Used to Simulate Groundwater Flow and Nitrogen Transport in the Long Island Sound Watershed on Long Island, New York
This model application data release documents coupled transient and steady-state regional and inset numerical models of the Long Island aquifer system to simulate groundwater flow and nitrogen transport using the US Geological Survey groundwater modeling software MODFLOW 6 (Langevin and others, 2017 and 2022). The regional model domain encompasses all of Long Island, New York, while the...
Geospatial Dataset of Coastal Inundation Maps for Long Island, NY and Long Island Sound (CT/NY) Geospatial Dataset of Coastal Inundation Maps for Long Island, NY and Long Island Sound (CT/NY)
This data release contains shapefiles and raster data of spatially distributed water level inundation, water depth, wave discharge and a set of hazard ranks for water levels, waves, and a combination of both for coastal areas of Long Island, NY and Long Island Sound. Water inundation and depth data include both current and future projections of inundation based on 4 annual exceedance...
Geospatial Datasets of Factors Influencing Pluvial Flood Potential in Long Island, New York and Near Coastal Areas Surrounding Long Island Sound in New York, Connecticut, and Rhode Island Geospatial Datasets of Factors Influencing Pluvial Flood Potential in Long Island, New York and Near Coastal Areas Surrounding Long Island Sound in New York, Connecticut, and Rhode Island
This data release provides spatial digital data for factors that influence pluvial flood hazard potential, including closed depressions, curve number, drainage networks, topographic slope, average annual rainfall, 1-hr and 24-hour 100-year return period rainfall accumulation, and locations of recorded floods. In addition, these flood influencing factors are summarized to a common 900...
National Shoreline Change—A GIS compilation of vector shorelines and associated shoreline change data from the 1800s to the 2010s for the coast of Long Island Sound, New York and Connecticut National Shoreline Change—A GIS compilation of vector shorelines and associated shoreline change data from the 1800s to the 2010s for the coast of Long Island Sound, New York and Connecticut
The U.S. Geological Survey (USGS) maintains shoreline positions for the United States coasts from various historical sources, such as aerial photographs or topographic surveys, and contemporary sources, such as lidar-point clouds and digital elevation models. Shorelines are compiled in a GIS and analyzed in the USGS Digital Shoreline Analysis System (DSAS) software to calculate rates of...
Geospatial Datasets of Factors Influencing Groundwater Emergence Flood Hazard in Long Island, New York and near Coastal Areas Surrounding Long Island Sound in New York, Connecticut, and Rhode Island Geospatial Datasets of Factors Influencing Groundwater Emergence Flood Hazard in Long Island, New York and near Coastal Areas Surrounding Long Island Sound in New York, Connecticut, and Rhode Island
This data release contains raster datasets representing depth to water table, calculated from steady-state groundwater models developed by the U.S. Geological Survey (Jahn and others, 2024; Barclay and others, 2024). The depth to water table rasters are available at an approximate resolution of 10 meters. In addition, depth to water table, hydrologic soil types, and landcover are...
Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Southport and Saugatuck Embayments, Connecticut, 2022-2024 Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Southport and Saugatuck Embayments, Connecticut, 2022-2024
This data release includes hydroacoustic data for the 2022 to 2024 water years at four stations. These stations are part of a discrete and continuous monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The data were collected by the U.S Geological Survey (USGS) in cooperation with the Connecticut Departments of Energy and...
Water Quality Vertical Profile Data to Support Embayment Monitoring in Long Island Sound, Saugatuck and Sasco-Southport Embayments, Connecticut, 2022-2024 Water Quality Vertical Profile Data to Support Embayment Monitoring in Long Island Sound, Saugatuck and Sasco-Southport Embayments, Connecticut, 2022-2024
This data release includes vertical water-quality profile data collected from April 2022 to April 2024 at three locations in the Saugatuck River Embayment near Saugatuck, Connecticut, and two locations in the Mill River and one at the mouth of Sasco Brook near Southport Harbor, Connecticut, for the Sasco-Southport Embayment that discharge to Long Island Sound. These data were collected...
Hydroacoustic Water Velocity Data to Support Embayment Monitoring in Long Island Sound, Mystic, Norwalk, Saugatuck, and Sasco-Southport Embayments, Connecticut, 2021-2024 Hydroacoustic Water Velocity Data to Support Embayment Monitoring in Long Island Sound, Mystic, Norwalk, Saugatuck, and Sasco-Southport Embayments, Connecticut, 2021-2024
This data release includes hydroacoustic transect data collected in 2021, 2022, 2023, and 2024 water years at multiple locations throughout four embayments. These locations are part of a discrete and continuous monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The transect data were collected by the U.S. Geological Survey...
Data to Assess Nitrogen Export from Forested Watersheds in and near the Long Island Sound Basin with Weighted Regressions on Time, Discharge, and Season (WRTDS) Data to Assess Nitrogen Export from Forested Watersheds in and near the Long Island Sound Basin with Weighted Regressions on Time, Discharge, and Season (WRTDS)
The U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency's Long Island Sound Study (https://longislandsoundstudy.net), characterized nitrogen export from forested watersheds and whether nitrogen loading has been increasing or decreasing to help inform Long Island Sound management strategies. The Weighted Regressions on Time, Discharge, and Season (WRTDS...
Water quality vertical profile data to support embayment monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2021-2023: U.S. Geological Survey data release Water quality vertical profile data to support embayment monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2021-2023: U.S. Geological Survey data release
This data release includes vertical water-quality-profile data from April 2021 to April 2023 at four stations in the Mystic River embayment and three stations in the Norwalk River embayment in Connecticut. These stations are part of a discrete and continuous water-quality monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The...
Summary Simulated Groundwater-transported Nitrogen Loads on the North Shore of Long Island Sound and Associated Data Summary Simulated Groundwater-transported Nitrogen Loads on the North Shore of Long Island Sound and Associated Data
A monthly model of groundwater-transported nitrogen loads was developed for 12-digit hydrologic unit code (HUC12) watersheds on the north shore of Long Island Sound in coastal Connecticut and adjacent areas of New York and Rhode Island. As part of the analysis, potential management actions that upgraded septic systems or reduced fertilizer application to areas of turf-grass were also...