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BACKGROUND Long Island Sound has 600 miles of coastline and there are over 23 million people living within 50 miles of its shores. In response to water-quality issues and nitrogen pollution in the Sound, Congress created the Long Island Sound Study (LISS) in 1985. LISS is a partnership of federal, state, and local government agencies, private organizations and educational institutions working together to restore and protect the Sound. The USGS New England and New York Water Science Centers are partners in the LISS. These organizations also have historical and ongoing work with other partners in the LISS study region. Although historically the focus of LISS has been on water quality issues, a “Sustainable and Resilient...
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Digital flood-inundation maps for a 2.4-mile reach of the Schoharie Creek in North Blenheim, New York, were created by the U.S. Geological Survey (USGS) in cooperation with the New York Power Authority. The flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science web site at https://fim.wim.usgs.gov/fim/, depict estimates of the areal extent and depth of flooding corresponding to selected water levels (stages) at the USGS streamgage on the Schoharie Creek near North Blenheim, NY (station number 01350212). Flood profiles were computed for the stream reach by means of a two-dimensional implicit finite volume hydraulic model. The model was calibrated using the active (as of April,...
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Summary: Extreme flooding can threaten life and property in flood-prone areas, as well as cause damage to critical infrastructure along roadways and canals. The effective management of these areas, and appropriate design of structures along rivers and streams, relies on understanding the magnitude and frequency of floods at gaged locations, and the ability to estimate these data at ungaged streams. Peak flow analysis and development of regional regression equations to estimate peak flow frequency and magnitude for New York have not been updated using any new data collected since 1999 (Lumia, 2006). As more data and newer technology have become available there is a need to update these data. The updated regression...
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This data release contains results of a high-water mark survey across the five boroughs of New York City following flash flooding caused by the remnants of Hurricane Ida, September 1, 2021. The survey was conducted between September 7 and November 23, 2021, and is based on observations of mud, debris, and seed lines left by the flooding. Real time and static GNSS surveying as well as available lidar data were used to determine high-water mark elevations at 83 locations. Additional data associated with Hurricane Ida flooding can be found in the USGS Flood Event Viewer, https://stn.wim.usgs.gov/fev/#2021Ida
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Management of transportation networks is affected by, and has effects on, natural and cultural resources through direct and indirect interactions. Until recently, the availability of such spatially explicit information has been limited; however, the data released here to the public will prove valuable for comparing existing networks and planning options with respect to potential impact to, or from, environmental factors across broad areas, for example, States and Agency Planning Regions. Integrated network and resource analyses can provide insights into potential construction and maintenance costs as well as safety risks and environmental impacts during project planning and assessment. A cooperative project was...
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The U.S. Geological Survey (USGS) is collaborating with the New York Department of State (NYDOS) Office of Planning and Development to prepare a new Long Island South Shore Estuary Reserve (SSER) Coordinated Water Resources Monitoring Strategy (CWRMS). Since 2000, when the last CWRMS was published, numerous research projects and studies are demonstrating several new threats to the ecologic health and resilience of the SSER. Contemporary threats include: Eutrophic conditions brought on by high levels of nutrients from sewage treatment plant discharges, stormwater runoff, groundwater seepage, and atmospheric contributions; Increased occurrences of harmful algal blooms in the past 15 years; and, Growing concern...
Categories: Data, Project; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Biogeochemical and Hydrologic Assessment, Biogeochemical and Hydrologic Assessment, BiogeochemicalandHydrologicAssessment, Climate and Land-Use Change, Climate and Land-Use Change, All tags...
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The coastal areas of southeastern New York (fig. 1) are highly vulnerable to tidal flooding (fig. 2). Timely evacuation of people from flood-threatened areas in advance of approaching hurricanes and nor'easters (northeast coastal storms) requires adequate flood-warning time. To begin addressing this need for immediate information on coastal flooding, the U.S. Geological Survey (USGS), in cooperation with the Town of Hempstead Department of Conservation & Waterways, Village of Freeport, and New York State Department of Environmental Conservation, has operated a network of real-time tidal water-elevation and meteorological stations since 1997 in the coastal areas of Long Island and New York City. Each tidal water-elevation...
Categories: Data, Project; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Climate Impacts, Climate Impacts, Climate impacts, Coastal Science, Coastal Science, All tags...
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Problem Coastal communities are susceptible to damage from coastal storms and associated storm surge, and although tidal wetlands provide a buffer against shoreline erosion and aid in shoreline stabilization, they too are vulnerable to the action of storms. Tidal wetland dynamics need to be better understood, as they are also intrinsically valuable as nursery, feeding, and refuge areas for many commercial and recreational fisheries, and significantly contribute to the base of the marine food web. Wetlands trap sediments, reduce turbidity, and absorb nutrients and pollutants thereby improving water quality, and they provide many recreational opportunities. Tidal wetland stability needs to be assessed using a sediment...
Categories: Data, Project; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Beach and Barrier dynamics, Climate and Land-Use Change, Climate and Land-Use Change, Climate and Land-Use Change, Coastal Science, All tags...
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The remnants of Hurricane Ida produced significant rainfall over the five boroughs of New York City (NYC) for several hours on September 1st, 2021. The long-duration, high-intensity rainfall resulted in extensive inundation of streets, buildings, subways, and other public spaces. In response to a Federal Emergency Management Agency (FEMA) mission assignment, the U.S. Geological Survey (USGS) identified and surveyed high-water marks (HWMs) at 83 locations across NYC to document the peak water elevation in impacted areas (Capurso and others, 2023). This data release contains maps of water-depth and inundation extents for areas within 250 meters of surveyed HWM locations. These depth maps assume a constant water-surface...
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Problem - During 2003-07, a precipitation-runoff watershed model with water-quality components was developed to assess pollutant sources and loadings to Onondaga Lake, and to assist water-resources managers in making decisions regarding the selection and location of mitigative measures to maximize load reduction for a given effort. In the absence of chemical loading rates that were specific to the Onondaga Lake Basin, the model was calibrated to estimated loading rates that were derived from a review of scientific literature. During 2005-08, an intensive water-quality study of the basin was conducted to provide basin-specific data that, among other uses, could be incorporated into the watershed model and provide...
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This data release contains results of a high-water mark survey across Upstate New York following flash flooding during July 9-10, 2023. The survey was conducted between July 12 and September 20, 2023 by U.S. Geological Survey (USGS) personnel, and is based on surveyed elevations of mud, debris, and seed lines (Koenig and others, 2016) left by the flooding. Real-time and static Global Navigation Satellite System (GNSS) surveying (Rydlund and Densmore, 2012), combined with differential leveling (Kenney, 2010), were used to determine high-water mark elevations at 186 locations. Additional data associated with the July 2023 flooding, such as photos of the survey locations, can be found in the USGS Flood Event Viewer,...
As a Science Topic for New York Water Science Center’s (NYWSC) Coastal Science Capability Team, Flood Hazards includes documenting and analyzing flood data for the Atlantic Ocean and Great Lakes and their many interconnected waterways. In cooperation with State and local organizations, the NYWSC is working to sustain and enhance vital flood-warning networks. The NYWSC leverages its institutional knowledge and that of its partners (like the National Weather Service) to provide regional and local emergency managers with timely information on flood hazards, including statistics such as annual exceedance probabilities (for example, on 100-year-recurrence-interval coastal-flood events). Results are disseminated through...


    map background search result map search result map Simulation of Flow and Water Quality by a Precipitation-Runoff Model of the Onondaga Lake Watershed, Onondaga County, New York Southeastern New York Tide-Telemetry and Coastal-Flood-Warning System Estuarine Physical Response to Storms—Jamaica Bay Development of a Coordinated Water Resources Monitoring Strategy for the South Shore Estuary Reserve, Long Island NY Compilation and Assessment of Resource Values and Hazards to Inform Transportation and Associated Land-use Planning Geospatial datasets and hydraulic model for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Depth grids for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Inundation polygons for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Hydraulic model for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Methods for Estimation Flood Magnitude and Frequency at Ungaged Streams in New York, excluding Long Island Assessment of compound flood risk from the combined effects of sea level rise on storm surge,  tidal and groundwater flooding, and stormwater High-Water Marks in the Five Boroughs of New York City from Flash Flooding Caused by the Remnants of Hurricane Ida, September 1, 2021 Water-surface elevation grids for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Field survey points for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Geospatial Datasets of Water Surface Elevation and Water Depth in New York City, NY Associated with the Remnants of Hurricane Ida – September 1, 2021 High-Water Mark Elevations in Upstate New York from Flash Flooding during July 9-10, 2023 Geospatial datasets and hydraulic model for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Inundation polygons for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Hydraulic model for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Depth grids for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Water-surface elevation grids for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Field survey points for flood-inundation maps for the Schoharie Creek in North Blenheim, NY Estuarine Physical Response to Storms—Jamaica Bay High-Water Marks in the Five Boroughs of New York City from Flash Flooding Caused by the Remnants of Hurricane Ida, September 1, 2021 Geospatial Datasets of Water Surface Elevation and Water Depth in New York City, NY Associated with the Remnants of Hurricane Ida – September 1, 2021 Simulation of Flow and Water Quality by a Precipitation-Runoff Model of the Onondaga Lake Watershed, Onondaga County, New York Development of a Coordinated Water Resources Monitoring Strategy for the South Shore Estuary Reserve, Long Island NY Assessment of compound flood risk from the combined effects of sea level rise on storm surge,  tidal and groundwater flooding, and stormwater Southeastern New York Tide-Telemetry and Coastal-Flood-Warning System High-Water Mark Elevations in Upstate New York from Flash Flooding during July 9-10, 2023 Methods for Estimation Flood Magnitude and Frequency at Ungaged Streams in New York, excluding Long Island Compilation and Assessment of Resource Values and Hazards to Inform Transportation and Associated Land-use Planning