Height Above Nearest Drainage (HAND) at Three-Meter Resolution for the State of Texas

This URL: https://web.corral.tacc.utexas.edu/nfiedata/pin2flood/texas/

Citation: Liu, Yan, David Maidment, Andy Carter, Paola Passalacqua, and Tim Whiteaker. "Height Above Nearest Drainage (HAND) at Three-Meter Resolution for the State of Texas." United States: N. p., 2023. Web. doi:10.13139/ORNLNCCS/2204010.

Download links

• standard datasets indexed by Texas HUC8s
• standard datasets indexed by Texas HUC6s
• full datasets indexed by Texas HUC8s
• full datasets indexed by Texas HUC6s
• Flowline dataset for the entire Texas (GeoPackage GPKG format)
• Flowline dataset for the entire Texas (FileGDB format)
• synthetic rating curves and flowlines only, indexed by Texas HUC8s

The current National Water Model and its Flood Inundation Mapping (FIM) service use 10-meter Height Above Nearest Drainage (HAND) hydrological terrain. In the Pin2Flood Project, led by the Center for Water and the Environment at UT Austin, Oak Ridge National Laboratory (ORNL) computed the 3-meter HAND and associated synthetic rating curves for the State of Texas, covering 287,535 river streams (1.5km/stream) in 209 HUC8s.

This archived dataset includes the HAND raster and the synthetic rating curve table for each of the 209 HUC8s in Texas. The full dataset is hosted at the Texas Advanced Computing Center (TACC).

This 3-meter HAND is derived from the Fathom 3-meter DEM and NHDPlus V21 using an accelerated version of NOAA's Flood Inundation Mapping version 3 (FIM3).

Synthetic rating curve table attributes

• FATSGTID: river segment ID (HydroID)
• feature_id: matched COMID in NHDPlus V21
• NextDownID: downstream ID
• order_: stream order
• stage: stage heigh (m). range: 0-25m
• discharge_cms: stream flow rate (cms)
• HydraulicRadius (m): hydraulic radius
• WetArea (m2): wet area
• SLOPE: slope of the river segment
• ManningN: Manning's N of the river segment
• HUC: HUC(8) ID
• LakeID: lake ID, if part of the lake water body
• RP_Q_years: flood return period. range: 1-42. level: COMID
• CPE_Q: cumulative probability estimate. level: COMID
• EPE_Q: exceedance probability estimate. level: COMID
• BF_Q_cms_67: bankfull discharge (cms). 67% percentile. level: COMID
• RP_H_years: flood return period. range: 1-42. level: FATSGTID
• CPE_H: cumulative probability estimate. level : FATSGTID
• EPE_H: exceedance probability estimate. level: FATSGTID
• BF_H_m_67: bankfull discharge (cms). 67% percentile. level : FATSGTID
• cda_sqkm: upstream cumulative drainage area (CDA), derived from the HydroID (FATSGTID)-based river network. If a river flows into a HUC, the first HydroID's CDA is initialized as: (catchment_area + TotDASqkm - COMID_catchment_area), where TotDASqkm is carried from NHDPlusV21 MR
• cda_LimDisch_cms: matched limiting discharge (cms)
• cda_sqmi: CDA (square miles)
• cda_LimDisch_cfs: matched limiting discharge (cfs)
• cda_PctLimDisch: ratio percentage: discharge/ max_streamflow * 100. If exceeding 100, ignore or treated as 100

LICENSE FOR USE -- MAPS AND DATA DISCLAIMER

This resource is shared under the Creative Commons Attribution CC BY, http://creativecommons.org/licenses/by/4.0/

MAPS AND DATA DISCLAIMER

The University of Texas at Austin or Oak Ridge National Laboratory (ORNL) shall not be held liable for improper or incorrect use of the data described or information contained on this map or associated series of maps. The data and related map graphics are not legal, land survey or engineering documents and are not intended to be used as such.

The University of Texas at Austin or ORNL gives no warranty, express or implied, as to the accuracy, reliability, utility or completeness of this information. The user of these maps and data assumes all responsibility and risk for the use of the maps and data. The University of Texas at Austin and ORNL disclaim all warranties, representations or endorsements either express or implied, with regard to the information contained in this map product, including, but not limited to, all implied warranties of merchantability, fitness for a particular purpose or non-infringement.

This published map product is intended for research and review purposes only. It is not intended to be used for emergency management operational or life safety decisions at the local or regional governmental level or by the general public. Users requiring information regarding hazardous conditions or meteorological conditions for specific geographic areas should consult directly with their city or county emergency management office.

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Contact

• Yan Liu, Oak Ridge National Laboratory
• David Maidment, University of Texas at Austin