(Link to Metadata) This Topographically-defined Floodplain dataset is a high-resolution raster that communicates the extent and frequency of flood inundation along rivers that drain 2 square-miles or more in the Lake Champlain Basin, Vermont. This dataset represents the lateral extents of flooding for storms of recurrence intervals ranging from 2 to 500 years.  It includes eight modeled storm sizes (2, 5, 10, 25, 50, 100, 200, and 500 year peak floods) informed by regional regression analyses built from Vermont watershed characteristics and the historical hydrology of the region. The Floodplain dataset represents the flood inundation extents as they are topographically defined at the time of the most recent LiDAR data collection, which varies from 2013 to 2017.Because of simplifications made to represent hydraulic processes in the modeling approach and uncertainties and errors in large scale model parameterization (e.g., flood peak discharges at ungauged reaches, roughness values), there are limitations to its uses.This floodplain model is intended for planning and research use by government, academic, commercial and non-governmental agencies; it is NOT a substitute for FEMA Flood Insurance Rate Maps and is not intended for regulatory use.

(Link to Metadata) This Topographically-defined Floodplain dataset is a high-resolution raster that communicates the extent and frequency of flood inundation along rivers that drain 2 square-miles or more in the Lake Champlain Basin, Vermont. This dataset represents the lateral extents of flooding for storms of recurrence intervals ranging from 2 to 500 years.  It includes eight modeled storm sizes (2, 5, 10, 25, 50, 100, 200, and 500 year peak floods) informed by regional regression analyses built from Vermont watershed characteristics and the historical hydrology of the region. The Floodplain dataset represents the flood inundation extents as they are topographically defined at the time of the most recent LiDAR data collection, which varies from 2013 to 2017.Because of simplifications made to represent hydraulic processes in the modeling approach and uncertainties and errors in large scale model parameterization (e.g., flood peak discharges at ungauged reaches, roughness values), there are limitations to its uses.This floodplain model is intended for planning and research use by government, academic, commercial and non-governmental agencies; it is NOT a substitute for FEMA Flood Insurance Rate Maps and is not intended for regulatory use.

(Link to Metadata) This Topographically-defined Floodplain dataset is a high-resolution raster that communicates the extent and frequency of flood inundation along rivers that drain 2 square-miles or more in the Lake Champlain Basin, Vermont. This dataset represents the lateral extents of flooding for storms of recurrence intervals ranging from 2 to 500 years.  It includes eight modeled storm sizes (2, 5, 10, 25, 50, 100, 200, and 500 year peak floods) informed by regional regression analyses built from Vermont watershed characteristics and the historical hydrology of the region. The Floodplain dataset represents the flood inundation extents as they are topographically defined at the time of the most recent LiDAR data collection, which varies from 2013 to 2017.Because of simplifications made to represent hydraulic processes in the modeling approach and uncertainties and errors in large scale model parameterization (e.g., flood peak discharges at ungauged reaches, roughness values), there are limitations to its uses.This floodplain model is intended for planning and research use by government, academic, commercial and non-governmental agencies; it is NOT a substitute for FEMA Flood Insurance Rate Maps and is not intended for regulatory use.

(Link to Metadata) This Topographically-defined Floodplain dataset is a high-resolution raster that communicates the extent and frequency of flood inundation along rivers that drain 2 square-miles or more in the Lake Champlain Basin, Vermont. This dataset represents the lateral extents of flooding for storms of recurrence intervals ranging from 2 to 500 years.  It includes eight modeled storm sizes (2, 5, 10, 25, 50, 100, 200, and 500 year peak floods) informed by regional regression analyses built from Vermont watershed characteristics and the historical hydrology of the region. The Floodplain dataset represents the flood inundation extents as they are topographically defined at the time of the most recent LiDAR data collection, which varies from 2013 to 2017.Because of simplifications made to represent hydraulic processes in the modeling approach and uncertainties and errors in large scale model parameterization (e.g., flood peak discharges at ungauged reaches, roughness values), there are limitations to its uses.This floodplain model is intended for planning and research use by government, academic, commercial and non-governmental agencies; it is NOT a substitute for FEMA Flood Insurance Rate Maps and is not intended for regulatory use.

The Indiana Floodplain Information Portal, INFIP, is a mapping application for the State of Indiana that allows you to view the floodplain map along a waterway. INFIP also provides answers to frequently asked questions related to floodplains, floodways, and state floodplain regulations.INFIP provides base flood elevations (BFE) at a selected point (i.e. your residence or tract of land) where floodplain studies have been completed. INFIP provides base flood elevations for both published flood insurance studies (Zone AE) and approximate studies (Zone A). If no base flood elevation currently exists at your selected point of interest, the Division of Water can provide that information to you upon request. For approximate studies with base flood elevations in Zone A, a Floodplain Analysis / Regulatory Assessment (FARA), issued by the Department of Natural Resources will be required: for obtaining a local building permit for construction in and around a floodplain as part of an application to FEMA for a Letter of Map Amendment (LOMA) INFIP allows you to submit a request for a FARA from the Division of Water using the e-FARA (electronic Floodplain Analysis / Regulatory Assessment) Wizard. The e-FARA Wizard saves you time and money by eliminating the need for you to complete a paper request that must be mailed to the Division of Water in Indianapolis. By using the e-FARA Wizard, your information is directly logged in the Division of Water's database. In addition, the e-FARA Wizard allows you to attach copies of documents such as legal descriptions, drawings, etc. that are helpful in completing the floodplain analysis more quickly. If a base flood elevation is available on INFIP at your point of interest, the Division will issue a response to you by email within 10 business days. If a base flood elevation is not available on INFIP at your point of interest, the Division's response time will depend on the data resources available in our office. The data layer "Effective Special Flood Hazard Area" is an interim version of the Digital Flood Insurance Rate Map (DFIRM) produced by the Indiana Department of Natural Resources in 2004. The purpose of this interim product is to provide much of the same information as the paper FIRM while the data is being updated and enhanced to meet the FEMA DFIRM standard through the Map Modernization program. The hardcopy FIRM and DFIRM and the accompanying Flood Insurance Study reports are the official designation of the Special Flood Hazard Areas and Base Flood Elevations for use in the National Flood Insurance Program. The flood hazard information shown in the "Effective Special Flood Hazard Area" for counties derived from the official FEMA digital products represent official FEMA designations of the Special Flood Hazard Areas. This data can be used for official NFIP purposes in accordance with the FEMA Mitigation Directorate Policy document tiled "Use of Digital Flood Hazard Data" dated November 29, 2007. A list of counties that have digital data published by FEMA can be found at http://www.in.gov/dnr/water/3484.htm; digital counties are shown in blue. The data layer "Preliminary Special Flood Hazard Area" is a proposed DFIRM issued by FEMA for acceptance and approval as an official DFIRM for the particular county covered. This flood hazard information is for outreach, advisory and review purposes only, and is subject to revision. It should not be used for regulation, enforcement and insurance rating purposes, and should not be used for mandatory flood insurance requirement purposes.

The data contained in this dataset is a synthesis of existing information on levees in the State of Washington. The shapefiles displayed attempt to depict levee centerlines as accurately as possible. Primary data sources include the U.S. Army Corps of Engineers and the Federal Emergency Management Agency, In addition to these sources, inputs from local levee managers were used to augment the aforementioned sources.

The dataset contains lab analyzed water chemistry and field collected data from hand held sondes. This dataset is associated with the following publication: Narr, C.F., H. Singh, P. Mayer, A. Keeley, B. Faulkner, D. Beak, and K.J. Forshay. Quantifying the Effects of Surface Conveyance of Treated Wastewater Effluent on Groundwater, Surface Water, and Nutrient Dynamics in a Large River Floodplain. ECOLOGICAL ENGINEERING. Elsevier Science Ltd, New York, NY, USA, 129: 123-133, (2019).

The Channel Migration Potential (CHAMP) layer contains stream networks of Western Washington (and much of Western Oregon) with associated data and information important for assessing channel migration activity. It also features information on channel characteristics such as stream flow and physical dimensions. This data layer’s main feature is a classification of channel migration potential based on channel confinement and erosion potential. The layer was derived from existing statewide geospatial datasets and classified according to channel migration measurements by the High Resolution Change Detection (HRCD) project for the Puget Sound Region (Washington Department of Fish and Wildlife, 2014). While the layer identifies the potential for channel migration, it does not predict channel migration rates. Thus, this data layer should be used to screen and prioritize stream reaches for further channel migration evaluation. The tool helps plan and prioritize floodplain management actions such as Channel Migration Zone mapping, erosion risk reduction, and floodplain restoration. The background, use, and development of the CHAMP layer are fully described in Ecology Publication 15-06-003 (full report citation and URL below). That report also describes visual assessment techniques that should be used along with the CHAMP layer to assess channel migration potential. Legg, N.T. and Olson, P.L., 2015, Screening Tools for Identifying Migrating Stream Channels in Western Washington: Geospatial Data Layers and Visual Assessments: Washington State Department of Ecology Publication 15-06-003, 40 p. https://fortress.wa.gov/ecy/publications/SummaryPages/1506003.htmlThe tool developers would like to thank the following people for their contribution to this work: • Brian D. Collins (University of Washington) • Jerry Franklin (Washington Department of Ecology) • Christina Kellum (Washington Department of Ecology) • Matt Muller (Washington Department of Fish and Wildlife) • Hugh Shipman (Washington Department of Ecology) • Terry Swanson (Washington Department of Ecology) This project has been funded wholly or in part by the United States Environmental Protection Agency under Puget Sound Ecosystem Restoration and Protection Cooperative Agreement Grant PC-00J27601 with Washington Department of Ecology. The contents of this document do not necessarily reflect the views and policies of the Environmental Protection Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.Generally, this data layer should be used to screen and prioritize stream reaches for further channel migration evaluation. The data resolution does not allow one to predict channel migration. The classification identifies stream segments for further examination, and those that likely require limited attention or analysis. The potential uncertainty involved in the classification approach is a reason for the visual assessment techniques (described below in Ecology Publication 15-06-003) being described along with the CHAMP data layer.

This story map provides an overview of the New Hampshire Floodplain Management Program. Specific maps featured include:NH communities that participate in the National Flood Insurance Program (NFIP)NH communities that have adopted standards into their floodplain management ordinances that go beyond minimum NFIP regulatory standardsFEMA Risk MAP flood mapping projects that are underway in the state

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.Dataset SummaryPhenomenon Mapped: Flood Hazard AreasCoordinate System: Web Mercator Auxiliary SphereExtent: Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Marianas Islands and American Samoa.Visible Scale: The layer is limited to scales of 1:1,000,000 and larger. Use the USA Flood Hazard Areas imagery layer for smaller scales.Source: Federal Emergency Management AgencyPublication Date: October 5, 2022This layer is derived from the October 5, 2022 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.A web map featuring this layer is available for you to use.What can you do with this Feature Layer?Feature layers work throughout the ArcGIS system. Generally your work flow with feature layers will begin in ArcGIS Online or ArcGIS Pro. Below are just a few of the things you can do with a feature service in Online and Pro.ArcGIS OnlineAdd this layer to a map in the map viewer. The layer is limited to scales of approximately 1:1,000,000 or larger but an imagery layer created from the same data can be used at smaller scales to produce a webmap that displays across the full range of scales. The layer or a map containing it can be used in an application.Change the layer’s transparency and set its visibility rangeOpen the layer’s attribute table and make selections and apply filters. Selections made in the map or table are reflected in the other. Center on selection allows you to zoom to features selected in the map or table and show selected records allows you to view the selected records in the table.Change the layer’s style and filter the data. For example, you could change the symbology field to Special Flood Hazard Area and set a filter for = “T” to create a map of only the special flood hazard areas. Add labels and set their propertiesCustomize the pop-upUse in analysis tools to discover patterns in the dataArcGIS ProAdd this layer to a 2d or 3d map. The same scale limit as Online applies in ProUse as an input to geoprocessing. For example, copy features allows you to select then export portions of the data to a new feature class. Areas up to 1,000-2,000 features can be exported successfully.Change the symbology and the attribute field used to symbolize the dataOpen table and make interactive selections with the mapModify the pop-upsApply Definition Queries to create sub-sets of the layerThis layer is part of the Living Atlas of the World that provides an easy way to explore the landscape layers and many other beautiful and authoritative maps on hundreds of topics.

Flood-model data--in .tif format--that's depicted in Tile Layer Topographically Defined Floodplains - Lake Champlain Basin (probHAND 2022). Downloadable by HUC-8 area.

(Link to Metadata) The 2022 Topographically-defined Floodplains for Lake Champlain Basin were generated from high-resolution topographic data along rivers draining greater than 2 square miles. They are for planning and research use by government, academic, commercial and non-governmental agencies; they are not a substitute for FEMA Flood Insurance Rate Maps and they are not intended for regulatory use. The intent was to generate greater geospatial coverage of floodplains in the basin to support restoration and conservation project planning for improved water quality, enhanced flood and climate resilience, and expanded habitat and ecosystem functions. The model (raster) is served as an ArcGIS Tile Layer and as individual HUC-based .tiff files.A companion vector layer (Reaches) is included with this dataset to reflect various parameters, notices, and warnings associated with the model run at each reach.The ArcGIS Tile Layer is served in the WGS 1984 Web Mercator Auxiliary Sphere spatial reference; the .tiff files and Reaches are in the NAD 1983 VT State Plane Meters spatial reference.Dataset is representative of ground conditions at the time of the most recent State of Vermont LiDAR flights; 2013-2017 Additional information is available in report located in HAND report.

(Link to Metadata) This Topographically-defined Floodplain dataset is a high-resolution raster that communicates the extent and frequency of flood inundation along rivers that drain 2 square-miles or more in the Lake Champlain Basin, Vermont. This dataset represents the lateral extents of flooding for storms of recurrence intervals ranging from 2 to 500 years.  It includes eight modeled storm sizes (2, 5, 10, 25, 50, 100, 200, and 500 year peak floods) informed by regional regression analyses built from Vermont watershed characteristics and the historical hydrology of the region. The Floodplain dataset represents the flood inundation extents as they are topographically defined at the time of the most recent LiDAR data collection, which varies from 2013 to 2017.Because of simplifications made to represent hydraulic processes in the modeling approach and uncertainties and errors in large scale model parameterization (e.g., flood peak discharges at ungauged reaches, roughness values), there are limitations to its uses.This floodplain model is intended for planning and research use by government, academic, commercial and non-governmental agencies; it is NOT a substitute for FEMA Flood Insurance Rate Maps and is not intended for regulatory use.

This application is a tool that District of Columbia property owners may use to identify the flood risk-zone for their property. DDOE has made every reasonable effort to ensure the accuracy of data provided through this application, however the data is for informational purposes only, and is not to be construed as legally binding with respect to determination of the applicable flood insurance premiums or requirements. The District of Columbia does not assume any liability arising from the use of this data. Additional data may be obtained from FEMA Map Service Center (http://msc.fema.gov/). For more flood insurance information, please visit www.floodsmart.gov.