FEMA - Harvey Flood Depths Grid
|Authors:||Federal Emergency Management Administration (FEMA)|
|Owners:||David Arctur · Harvey datamgr|
|DOI:||10.4211/hs.165e2c3e335d40949dbf501c97827837 How to Cite|
|Resource type:||Composite Resource|
|Created:||Apr 21, 2018 at 2:49 a.m.|
|Last updated:||Nov 27, 2018 at midnight by David Arctur|
This resource describes a dataset of gridded depth at horizontal resolution of 3 meters, published November 15, 2017, downloaded from FEMA  and hosted in this archive at the University of Texas Advanced Computing Center (TACC) .. 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 . 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  for additional HWM-based depth grids and inundation polygons:
- Harris County 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
See also FEMA's journal of mitigation planning and actions related to Harvey .
References and related links:
 FEMA_Depths_3m_v3.zip (39 gb ftp download) [https://data.femadata.com/Region8/Mitigation/Data_Share/]
 TACC 39gb wget or ftp download [https://web.corral.tacc.utexas.edu/nfiedata/Harvey/flood_data/FEMA_Harvey_Depths_3m.gdb.zip]
 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]
 FEMA NHRAP ftp [https://data.femadata.com/FIMA/NHRAP/Harvey/]
 Hurricane Harvey Mitigation Portfolio - FEMA map journal [https://fema.maps.arcgis.com/apps/MapJournal/index.html?appid=70204cf2762d45409553fd9642700b7f]
How to cite
This resource is shared under the Creative Commons Attribution CC BY.http://creativecommons.org/licenses/by/4.0/
|Federal Emergency Management Administration (FEMA)|
|Mark English, GeoSpatial Risk Analyst||FEMA Region VIII - Mitigation Division|
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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|
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