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NOAA NWC - Harvey NWM-HAND Flood Extents

Authors: NOAA National Water Center · Erika Boghici · David Arctur
Owners: David Arctur · Harvey datamgr
DOI:10.4211/hs.fe85a680d0144e79b39e8c483dc1e5aa How to Cite
Resource type:Composite Resource
Created:Apr 17, 2018 at 6:18 a.m.
Last updated: Nov 27, 2018 at midnight by David Arctur


This dataset includes daily and storm-maximum flood extent estimates for the Harvey impact zone (and beyond) in Texas from August 28-September 3, 2017, based on the NOAA National Water Center (NWC) National Water Model (NWM) streamflow forecasts [1], with Height Above Nearest Drainage (HAND) method [2] applied to the NWM streamflow forecasts, and estimated rating curves for each stream reach. These were experimental results that were not used by the National Weather Service or Texas Division of Emergency Management operationally.

Note that while the daily grids show depth, the NWC cautioned to not rely on the depth information, but just use the grids in terms of their inundation extent.
The daily grids are tiff files, but the NWM_MaxExtents is a polygon feature class in an ArcGIS geodatabase, with NAD83-Albers coordinate reference system. This has proved difficult to export to shapefile format; the process would take so long with no apparent results that we've canceled the last 3 attempts to do this export.

Each zipfile of daily grids contains one day's set of NWM analysis runs, with a separate TIFF file for each of these HUC6 basins: 120100, 120200, 120301, 120302, 120401, 120402, 120500, 120601, 120602, 120701, 120702, 120800, 120901, 120902, 120903, 120904, 121001, 121002, 121003, 121004, 121101, 121102. Each day's analysis run is taken at a time encoded into the filename, such as 00z (midnight UTC), 09z, 21z, or 23z.

[1] NWM streamflow forecasts [https://www.hydroshare.org/resource/abb61157105746e5a03f983c0c6a8249/]
[2] HAND is an elevation model developed through processing by the TauDEM method [3], built on USGS National Elevation Data (NED) with 10m horizontal resolution. The HAND elevation data and 10m NED for the continental United States are available for download from the Texas Advanced Computational Center (TACC) [4].
[3] TauDEM Downloads [http://hydrology.usu.edu/taudem/taudem5/downloads.html]
[4] NFIE Continental Flood Inundation Mapping - Data Repository [https://web.corral.tacc.utexas.edu/nfiedata/]

Subject Keywords

Inundation,National Water Center,Hurricane,Forecasts,NWC,National Water Model,NWM,Flooding,Texas,Harvey2017

How to cite

NOAA National Water Center, E. Boghici, D. Arctur (2018). NOAA NWC - Harvey NWM-HAND Flood Extents, HydroShare, https://doi.org/10.4211/hs.fe85a680d0144e79b39e8c483dc1e5aa

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


Sharing status:

  • Published Resource  Published


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The people or organizations that created the intellectual content of the resource.

Name Organization Address Phone Author Identifiers
NOAA National Water Center Tuscaloosa, AL
Erika Boghici UT Austin Center for Water and the Environment
David Arctur University of Texas at Austin 512-771-1434
This resource belongs to the following collections:
Title Owners Sharing Status My Permission
Harvey Flood Data Collections David Arctur · Harvey datamgr  Published Open Access


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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