A polygon feature class of Federal Emergency Management Agency (FEMA) flood hazard zones within Miami-Dade County. The data depicts the inundation limits representing flood risk information and supporting data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by FEMA.Updated: Every 10 yrs The data was created using: Projected Coordinate System: WGS_1984_Web_Mercator_Auxiliary_SphereProjection: Mercator_Auxiliary_Sphere

description: Polygon feature class of Federal Emergency Management Agency (FEMA) Flood Hazard Zones for Miami-Dade County.; abstract: Polygon feature class of Federal Emergency Management Agency (FEMA) Flood Hazard Zones for Miami-Dade County.

A polygon feature class of the Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) map panels for Miami-Dade County.Updated: Every 10 yrs The data was created using: Projected Coordinate System: WGS_1984_Web_Mercator_Auxiliary_SphereProjection: Mercator_Auxiliary_Sphere

A polygon feature class of the Federal Emergency Management Agency (FEMA) Flood Zones for Miami-Dade County (1994).Updated: Not Planned The data was created using: Projected Coordinate System: WGS_1984_Web_Mercator_Auxiliary_SphereProjection: Mercator_Auxiliary_Sphere

The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). In addition to the preceding, required text, the Abstract should also describe the projection and coordinate system as well as a general statement about horizontal accuracy.

The Miami-Dade County Flood Zones web site will help you determine if your property is in a potential flood risk area.

This dataset, called FloodPop, contains estimates of the population and housing in high flood hazard areas in the contiguous US at the Census block, tract, county, and state levels as well as classified building footprints and validation data. The dataset corresponds with the forthcoming manuscript entitled “High-resolution estimates of the US population in high fluvial flood hazard areas”.

Note: The folders building_footprints.gdb, building_footprints_df, and validation/ buildings_w_lu.gdb contain modified building footprints from Overture Maps (https://overturemaps.org/), including information from OpenStreetMap (https://www.openstreetmap.org/), USA Structures, the National Structure Inventory, and the US release of Microsoft Building footprints. The data in building_footprints.gdb, building_footprints_df, and validation/buildings_w_lu.gdb are made available under the Open Database License (ODbL) v1.0 (https://opendatacommons.org/licenses/odbl/1-0/), while the rest of the repository is made available under the CC BY 4.0 license (https://creativecommons.org/licenses/by/4.0/) .

Contents

fp_summaries: FloodPop results in tabular and geospatial formats. Each file in this folder has columns from the original census dataset at the corresponding spatial scale and similar added columns.

Files • blocks_by_state.gdb: An Esri file geodatabase containing a feature class of FloodPop results at the Census block level for each state. State abbreviations are at the beginning of the feature class name. • cartographic.gdb: An Esri file geodatabase containing feature classes representing cartographic tract, county, and state level FloodPop estimates. The feature classes should be used for visualization but not used for analysis. • summaries.gdb: An Esri file geodatabase containing feature classes representing tract, county, and state level FloodPop estimates. The feature classes can be used for analysis. • summary_csvs: Comma Separated Value (CSV) files containing FloodPop estimates for Census blocks, tracts, counties, and states. This folder also contains a CSV (state_res_or_not_summary.csv) that summarizes the sources of building classifications by state, parsing out the count and area of buildings for residential (res_or_not = 1), non-residential (res_or_not = 0), and unknown (res_or_not = -1) buildings.

Added columns For files in the fp_summaries folder, estimates of the population, total housing units, and occupied housing units were appended to census data boundaries. Census variables “p1_001n” (total population), “h1_001n” (total housing units), and “h1_002n” (occupied housing units) were added to all census boundaries. Then, columns were added for each census variable intersecting each scenario of estimated flood hazard (SFHA, best-available SFHA, and either SFHA). Lower and upper bounds were calculated for population and occupied housing units but not for total housing units as block-level counts for total housing units did not have privacy noise added. Columns related to population use the prefix “pop_”, total housing units uses “tot_hu_”, and occupied housing units uses “occ_hu_”. An example of the naming convention for population estimate columns is below, and this was replicated for total housing units (without upper and lower bounds) and occupied housing units: • pop_sfha: Estimated population within the FEMA Special Flood Hazard Area (SFHA). • pop_sfha_low: Lower bounds (90% CI) of estimated population within the FEMA Special Flood Hazard Area (SFHA). • pop_sfha_high: Upper bounds (90% CI) of estimated population within the FEMA Special Flood Hazard Area (SFHA). • pop_best_sfha: Estimated population within the FEMA SFHA (if mapped by FEMA) or the estimated SFHA (if not mapped by FEMA). • pop_best_sfha_low: Lower bounds (90% CI) of estimated population within the FEMA SFHA (if mapped by FEMA) or the estimated SFHA (if not mapped by FEMA). • pop_best_sfha_high: Upper bounds (90% CI) of estimated population within the FEMA SFHA (if mapped by FEMA) or the estimated SFHA (if not mapped by FEMA). • pop_either_sfha: Estimated population within either the FEMA SFHA or estimated SFHA. • pop_either_sfha_low: Lower bounds (90% CI) of estimated population within either the FEMA SFHA or estimated SFHA. • pop_either_sfha_high: Upper bounds (90% CI) of estimated population within either the FEMA SFHA or estimated SFHA.

Additional columns for block-level results • out_sfha_area: Building footprint area (m2) that does not intersect the SFHA. • within_sfha_area: Building footprint area (m2) that intersects the SFHA. • ratio_area_sfha: The ratio of total building footprint area that intersects the SFHA. • out_est_sfha_area: Building footprint area (m2) that does not intersect the estimated SFHA. • within_est_sfha_area: Building footprint area (m2) that intersects the estimated SFHA. • ratio_area_est_sfha: The ratio of total building footprint area that intersects the estimated SFHA. • out_best_sfha_area: Building footprint area (m2) that does not intersect the best-available SFHA. • within_best_sfha_area: Building footprint area (m2) that intersects the best-available SFHA. • ratio_area_best_sfha: The ratio of total building footprint area that intersects the best-available SFHA. • out_either_sfha_area: Building footprint area (m2) that does not intersect either SFHA. • within_either_sfha_area: Building footprint area (m2) that intersects either SFHA. • ratio_area_either_sfha: The ratio of total building footprint area that intersects either SFHA. • ci_low: Lower bounds estimate (90% CI) of block population. • ci_high: Upper bounds estimate (90% CI) of block population. • ci_low_hu: Lower bounds estimate (90% CI) of block occupied housing units. • ci_high_hu: Upper bounds estimate (90% CI) of block occupied housing units.

validation: Folder containing geodatabases used for the presented validation exercises that focus on Mecklenburg County, NC, Miami-Dade County, FL, and Sacramento, CA. • buildings_w_lu.gdb: Modified Overture Maps building footprints for the validation area with land use classifications from local datasets. • input_cities.gdb: Parcels with classified land use from local datasets. • sj_cities.gdb: Parcels that intersect modified Overture Maps building footprints for the validation area. • validation_blocks.gdb: FloodPop estimates for census blocks that intersect modified Overture Maps building footprints for the validation area.

building_footprints.gdb: An Esri file geodatabase containing classified building footprint feature classes for each state used to create FloodPop estimates. Each footprint contains information on building classification, presence within the SFHA, estimated SFHA, and FEMA study footprint, and Census block. State abbreviations are at the beginning of the feature class name.

building_footprint_dfs: Folder containing a tabular version (Parquet format) of building footprints for each state. State abbreviations are at the beginning of the file name.

This EnviroAtlas dataset describes the total counts and percentage of population, land area, and impervious surface in the 1% Annual Chance Flood Hazard area or 0.2% Annual Chance Flood Hazard area of each block group. The flood hazard area is defined by the National Flood Hazard Layer (NFHL) produced by the Federal Emergency Management Agency (FEMA, www.fema.gov). This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).

Terrain data, as defined in FEMA Guidelines and Specifications, Appendix N: Data Capture Standards, describe the digital topographic data that were used to create the elevation data representing the terrain environment of a watershed and/or floodplain. Terrain data requirements allow for flexibility in the types of information provided as sources used to produce final terrain deliverables. Once this type of data is provided, FEMA will be able to account for the origins of the flood study elevation data.(Source: FEMA Guidelines and Specifications, Appendix N, Section N.1.2)

Terrain data, as defined in FEMA Guidelines and Specifications, Appendix M: Data Capture Standards, describes the digital topographic data that were used to create the elevation data representing the terrain environment of a watershed and/or floodplain. Terrain data requirements allow for flexibility in the types of information provided as sources used to produce final terrain deliverables. Once this type of data is provided, FEMA will be able to account for the origins of the flood study elevation data. (Source: FEMA Guidelines and Specifications, Appendix M, Section N.1.2).

A polygon feature class of the Coastal A Zone boundaries. Developed to aid the spatial location of the Coastal A Zones in Miami-Dade County for permitting purposes. Based on the Miami-Dade County Digital Flood Insurance Rate Map (DFIRM), effective September 11, 2009 published by FEMA and the ASCE 24 guidelines. 'Coastal A� Zone according to FEMA, is the area landward of a V Zone or landward of an open coast without mapped V Zones. In a coastal A Zone, the principal source of flooding will be astronomical tides, storm surges, seiches or tsunamis and not riverine flooding. During base flood conditions, the potential for breaking wave heights between 1.5 feet and 3.0 ft, will exist.Updated: Not Planned The data was created using: Projected Coordinate System: WGS_1984_Web_Mercator_Auxiliary_SphereProjection: Mercator_Auxiliary_Sphere

SWFWMD regularly uses digital topographic information to support regulatory, land management and acquisition, planning, engineering and habitat restoration projects. LiDAR data will support hydrologic modeling activities associated with the FederalEmergency Management Agency (FEMA), and in the creation of Digital Flood Insurance Rate Maps(DFIRM). The Light Detection and Ranging (LiDAR) LAS dataset is a survey of Lake Placid. The Lake Placid LiDAR Survey project area consists of approximately 44.8 miles. The LiDAR point cloud was flown at a density sufficient to support a maximum final post spacing of 4 feet for unobscured areas. 3001 Inc. acquired 38 flightlines on March 4, 2007. The data was divided into 5000' by 5000' cells that serve as the tiling scheme. The Lake Placid LiDAR Survey was collected under the guidance of a Professional Mapper/Surveyor.

Web map showing FEMA National Flood Hazard Layer (NFHL) flood zones, floodways, Flood Insurance Rate Map (FIRM) panels, and other information related to flooding in Volusia County, FL.