This dataset displays the locations of flood hazard zones identified by FEMA. The Federal Emergency Management Agency (FEMA) produces Flood Insurance Rate maps and identifies Special Flood Hazard Areas as part of the National Flood Insurance Program's floodplain management. Special Flood Hazard Areas have regulations that include the mandatory purchase of flood insurance. This layer is derived from the October 13, 2021 version of the National Flood Hazard Layer feature class S_Fld_Haz_Ar. The data were aggregated into eight classes to produce the Esri Symbology field based on symbology provided by FEMA. All other layer attributes are derived from the National Flood Hazard Layer.The layer was projected to Web Mercator Auxiliary Sphere, then the repair geometry geoprocessing tool was run on it. Its resolution was set to 0.0001 meter. To improve performance Flood Zone values "Area Not Included", "Open Water", "D", "NP", and No Data were removed from the layer. Areas with Flood Zone value "X" subtype "Area of Minimal Flood Hazard" were also removed. An imagery layer created from this dataset provides access to the full set of records in the National Flood Hazard Layer.View Dataset on the Gateway

This dataset displays Risk Areas which help illustrate the geographic distribution of coastal risk along the shoreline of Westchester, Nassau, Suffolk, and New York City Counties. The objective of the Risk Assessment (and resulting mapped Risk Areas) is to define areas at risk from coastal hazards. Data were collected from sources accurate enough to differentiate geographic areas according to the likelihood of flooding, erosion, waves and storm surge. To the extent allowed by source data, areas where flood water can extend up streams and under culverts and bridges are reflected in mapping. The mapping process and data sources used are described below. Mapped Risk Areas are classified into three categories: Extreme, High, and Moderate. Extreme Risk Areas: These are areas currently at risk of frequent inundation, vulnerable to erosion in the next 40 years, or likely to be inundated in the future due to sea level rise. Criteria and source data used to define these Extreme Risk Areas include: FEMA V zone. Areas subject to Shallow Coastal Flooding per NOAA NWS’s advisory threshold. Areas prone to erosion, natural protective feature areas susceptible to erosion. Added 3 feet to the MHHW shoreline and extended this elevation inland over the digital elevation model (DEM) to point of intersection with ground surface. These four criteria were overlaid and polygons were generated that included the maximum spatial extend of the above-listed criteria. These polygons represent Extreme Risk Areas. High Risk Areas: These are areas that fall outside of the Extreme Risk Areas and are currently at infrequent risk of inundation or are at risk in the future from sea level rise. Criteria and source data used to define these High Risk Areas include: Area bounded by the 1% annual flood risk zone (FEMA V and A zones). Added 3 feet to NOAA NWS coastal flooding advisory threshold and extended this elevation inland over the DEM to point of intersection with ground surface. Polygons were created that were upland of the Extreme Risk Area boundary and included the maximum spatial extent of the above-listed criteria. These polygons represent High Risk Areas. Moderate Risk Areas: These are areas that fall outside of the Extreme and High Risk Areas, but are currently at moderate risk of inundation from infrequent events or are at risk in the future from sea level rise. Criteria and source data used to define these High Risk Areas include: Area bounded by the 0.2% annual risk (500 year) flood zone, where available; Added 3 feet to the Base Flood Elevation for the current 1% annual risk flood event and extended this elevation inland over the DEM to point of intersection with ground surface; Area bounded by SLOSH category 3 hurricane inundation zone. Polygons were created that were upland of the Extreme and High Risk Area boundaries and included the maximum spatial extent of the above-listed criteria. These polygons represent Moderate Risk Areas. (7/1/13)View Dataset on the Gateway

This dataset identifies areas where the addition of new ponds would benefit Great Crested Newt populations.The core areas contain a pond density of 2+ ponds and are located within a 1km square where great crested newt presence has been predicted.Fringe areas contain a pond density of 1 and are located within a 1km square where great crested newt presence has been predicted or are within a 250m of a Core Area.Higher scores are associated with darker colouration and represent a greater presence of suitable habitat features: Distance from a River 200-2000m; Soil pH 6.5 – 7.5; Soil Phosphorus 35 -45 mg kg-1; Arable Density < 33%; Distance from Grassland <100m; Grassland Density 10 -40%; Distance from Woodland < 100m. These suitable habitat features have been given a score of ‘1’.Urban areas > 2ha (+400m buffer), roads (7.5m), rivers (7.5m) and Environment Agency Flood Zone 2 have been excluded.Full metadata can be viewed on data.gov.uk.Data used to generate this derived data set includes the 2015 CEH Land Cover map (woodland, grassland,urban and arable land classifications), OS MasterMap (pond locations that have been converted by NE into pond densities), Natural Capital Soil pH and Phosphorus, Cranfield University Soils Data, Natural Engalnd GCN Class License Survey Returns England, Natural England GCN Pond Surveys DLL 17 18 19, OS Open Rivers, OS Open Roads, Environment Agency Flood Map - Flood Zone 2, OS Boundary Line District Boundaries, GCN data collated and provided by Norfolk Biodiversity Information Service and Allocations data from Nofolk County Council, Breckland District Council, Broadland District Council, South Norfolk District Council, Norwich City council, Kings Lynn & West Norfolk Borough Council, Great Yarmout, North Norfolk Council, Suffolk County Council, Suffolk Coastal District Council, Babergh District Council, Mid Suffolk District Council, Ipswich Council, The Broads National Park, West Suffolk council and Waveney District Council.Soil pH: Henrys, P.A.; Keith, A.M.; Robinson, D.A.; Emmett, B.A. (2012). Model estimates of topsoil pH and bulk density [Countryside Survey]. NERC Environmental Information Data CentreSoil Phosphorus: Henrys, P.A.; Keith, A.M.; Robinson, D.A.; Emmett, B.A. (2012). Model estimates of topsoil nutrients [Countryside Survey]. NERC Environmental Information Data CentreDOI for LCM2015 25m raster data for Great Britain:Rowland, C.S.; Morton, R.D.; Carrasco, L.; McShane, G.; O’Neil, A.W.; Wood, C.M. (2017) Land Cover Map 2015 (25m raster, GB). NERC Environmental Information Data Centre. https://doi.org/10.5285/bb15e200-9349-403c-bda9-b430093807c7DOI for LCM2015 Vector data for Great Britain: Rowland, C.S.; Morton, R.D.; Carrasco, L.; McShane, G.; O’Neil, A.W.; Wood, C.M. (2017) Land Cover Map 2015 (vector, GB). NERC Environmental Information Data Centre. https://doi.org/10.5285/6c6c9203-7333-4d96-88ab-78925e7a4e73

This group includes the following items: