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FEMA - Harvey Flood Depths Grid


An older version of this resource http://www.hydroshare.org/resource/165e2c3e335d40949dbf501c97827837 is available.
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Created: May 12, 2020 at 7:43 p.m.
Last updated: Sep 02, 2020 at 4:06 a.m.
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Abstract

This resource describes a dataset of gridded depth at horizontal resolution of 3 meters, published as an Esri ArcGIS geodatabase on November 15, 2017 by FEMA. This dataset is no longer accessible from FEMA, but is now hosted for this archive at Oak Ridge National Lab [1]. This product utilized Triangulated Irregular Network (TIN) interpolation, four quality assurance measures (identifying dips, spikes, duplication, and inaccurate/unrealistic measurements). High Water Marks were obtained from the Harris County Flood Control District (HCFCD), US Geological Survey (USGS), and other inspection data. Elevation data comprised a mosaic of 3 meter resampled elevations from 1M & 3M LiDAR, and IFSAR data. One section of the IfSAR data was found to be erroneous, and replaced with a blended 10 meter section.
[This method description was from correspondence January 22, 2018, from Mark English, GeoSpatial Risk Analyst, FEMA Region VIII, Mitigation Division.]

See FEMA's Natural Disasters ftp site [2] for additional HWM-based depth grids and inundation polygons:
- Harris County Areas of Interest (AOIs) and Inundation Boundaries
- Harris County Depth Grids
- Aransas, Nueces, and San Patricio Coastal Depth Grids and Boundaries

FEMA notes on these Modeled Preliminary Observations:
o Based on observed Water Levels at stream gauges interpolated along rivers, downsampled to 5m resolution DEM
o Depth grids updated with new observed peak crest as they become available
o Will include High Water Mark information as it becomes available
o Extents validated with remote sensing
o Use for determining damage levels on specific structures

References:
[1] FEMA_Harvey_Depths_3m.gdb.zip (36 gb download by ftp, wget or globus) [https://cfim.ornl.gov/data/nfiedata/Harvey/flood_data/]
[2] FEMA Harvey data [https://disasters.geoplatform.gov/publicdata/NationalDisasters/2017/HurricaneHarvey/Data/]

ADDENDUM:
Some of the downloadable files in this resource page were moved by FEMA from their previous location in the FEMA Natural Hazards Risk Assessment Program (NHRAP) server
[ https://data.femadata.com/FIMA/NHRAP/Harvey ] and elsewhere on [ https://data.femadata.com ] during the summer of 2019.

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Content

README.md

FEMA - Harvey Flood Depths Grid

This resource describes a dataset of gridded depth at horizontal resolution of 3 meters, published November 15, 2017, downloaded from FEMA [1] and now also hosted in an archive at the University of Texas Advanced Computing Center (TACC) [2]. The raster dataset is contained within an Esri ArcGIS geodatabase.

This product utilized Triangulated Irregular Network (TIN) interpolation, four quality assurance measures (identifying dips, spikes, duplication, and inaccurate/unrealistic measurements). High Water Marks were obtained from the Harris County Flood Control District (HCFCD), US Geological Survey (USGS), and other inspection data. Elevation data comprised a mosaic of 3 meter resampled elevations from 1M & 3M LiDAR, and IFSAR data. One section of the IfSAR data was found to be erroneous, and replaced with a blended 10 meter section. [This description was in correspondence January 22, 2018, from Mark English, GeoSpatial Risk Analyst, FEMA Region VIII, Mitigation Division.]

A preliminary version of these depths dated September 10, 2017 can be viewed in a FEMA web map [3]. This web map shows a forecasted depth grid, based on National Weather Service (NWS) Advanced Hydrologic Prediction Service (AHPS) forecasted water levels.

See FEMA's Natural Hazard Risk Assessment Program (NHRAP) ftp site [4] for additional HWM-based depth grids and inundation polygons:

  • Harris County AOIs and Inundation Boundaries [5]
  • Harris County Depth Grids [6]
  • Aransas, Nueces, and San Patricio Coastal Depth Grids and Boundaries [7]

FEMA notes on these Modeled Preliminary Observations:

  • Based on observed Water Levels at stream gauges interpolated along rivers, downsampled to 5m resolution DEM
  • Depth grids updated with new observed peak crest as they become available
  • Will include High Water Mark information as it becomes available
  • Extents validated with remote sensing
  • Use for determining damage levels on specific structures

See also FEMA's journal of mitigation planning and actions related to Harvey [8].

References

NOTE 1: References with URLs to “femadata.com” are no longer operational [1,4,5,6,7]. These links were used at the time this archive was prepared to obtain the zip files stored in this HydroShare resource.

NOTE 2: References to FEMA maps are no longer publicly accessible, but require FEMA login credentials [3, 8].

[1] FEMA_Depths_3m_v3.zip (39 gb ftp download) [https://data.femadata.com/Region8/Mitigation/Data_Share/]

[2] TACC 39gb wget or ftp download [https://web.corral.tacc.utexas.edu/nfiedata/Harvey/flood_data/FEMA_Harvey_Depths_3m.gdb.zip]

[3] FEMA map viewer for Hurricane Harvey resources (flood depths is bottom selection in layers list) [https://fema.maps.arcgis.com/apps/webappviewer/index.html?id=50f21538c7bf4e08b9faab430bc237c9]

[4] FEMA NHRAP ftp [https://data.femadata.com/FIMA/NHRAP/Harvey/]

[5] [https://data.femadata.com/FIMA/NHRAP/Harvey/Harris_AOIandBoundaries.zip]

[6] [https://data.femadata.com/FIMA/NHRAP/Harvey/Harris_Mosaic_dgft.zip]

[7] [https://data.femadata.com/FIMA/NHRAP/Harvey/Rockport_DG_unclipped.zip]

[8] Hurricane Harvey Mitigation Portfolio - FEMA map journal [https://fema.maps.arcgis.com/apps/MapJournal/index.html?appid=70204cf2762d45409553fd9642700b7f]

References

Related Resources

This resource cites: FEMA map viewer for Hurricane Harvey resources (flood depths is bottom selection in layers list) [https://fema.maps.arcgis.com/apps/webappviewer/index.html?id=50f21538c7bf4e08b9faab430bc237c9]
This resource cites: Hurricane Harvey Mitigation Portfolio - FEMA map journal [https://fema.maps.arcgis.com/apps/MapJournal/index.html?appid=70204cf2762d45409553fd9642700b7f]
This resource cites: FEMA Harvey depths, single ArcGIS raster gdb at TACC (39gb zipped, 50gb unzipped) [wget https://web.corral.tacc.utexas.edu/nfiedata/Harvey/flood_data/FEMA_Harvey_Depths_3m.gdb.zip]
This resource cites: FEMA_Depths_3m_v3.zip [https://data.femadata.com/Region8/Mitigation/Data_Share/Harvey_Depths_3m_v3.zip]
This resource updates and replaces previous version: http://www.hydroshare.org/resource/165e2c3e335d40949dbf501c97827837

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Science Foundation (NSF) RAPID: Archiving and Enabling Community Access to Data from Recent US Hurricanes 1761673

Contributors

People that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
GeoSpatial Risk Analyst Mark English FEMA Region VIII - Mitigation Division

How to Cite

Federal Emergency Management Administration (FEMA) (2020). FEMA - Harvey Flood Depths Grid, HydroShare, http://www.hydroshare.org/resource/e8768f4cb4d5478a96d2b1cbd00d9e85

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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