View Metadata
Channel and Floodplain Cross Sections, Comayagua, Honduras
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- Geological Survey (U.S.)
- Publication Date
- 2001
- Title
- Channel and Floodplain Cross Sections, Comayagua, Honduras
- Geospatial Data Presentation Form
- vector digital data
- Series Information
- Series Name
- OFR -
- Issue Identification
- 1201
- Publication Information
- Publication Place
- Tacoma, WA
- Publisher
- United States Geological Survey
- Online Linkage
- https://hgl.harvard.edu/catalog/harvard-usgs-ho-comayagua-comaxs
- Abstract
- Cross sections for the 50-year flood, for Rio Humuya, Comayagua, Honduras. Water-surface elevations for an estimated 50-year-flood discharge on Rio Humuya at Comayagua were determined using HEC-RAS, a one-dimensional step-backwater computer program. The channel and floodplain cross section geometry used in HEC-RAS were developed from an airborne light detection and ranging (LIDAR) topographic survey of the area. The 50-year-flood discharge for Rio Humuya, 1400 cubic meters per second, was estimated using a regression equation that relates the 50-year-flood discharge to drainage area and mean annual precipitation. The area of inundation and depth of flood coverage was created with the HEC-RAS output and topographic TIN using HEC-geo-RAS software.
- Purpose
- The 50-year flood depth maps provide a basis for land-use planning and for engineering design of structures near or within the floodplain of the Rio Humuya at Comayagua.
- Temporal Extent
- Currentness Reference
- publication date
- Time Instant
- 2001
- Bounding Box
- West
- -87.674856
- East
- -87.620000
- North
- 14.493885
- South
- 14.434392
- Theme Keyword
- Floods
- Floodplains
- Flood control
- Theme Keyword Thesaurus
- LCSH
- ISO Topic Category
- inlandWaters
- Theme Keyword
- cross sections
- Theme Keyword Thesaurus
- USGS
- Place Keyword
- Honduras
- Comayagua, Departamento de
- Comayagua
- Place Keyword Thesaurus
- GNS
- Temporal Keyword
- Access Restrictions
- None
- Use Restrictions
- This GIS data set has not received Director's approval and as such is provisional and subject to revision. The data are released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
- Status
- Complete
- Maintenance and Update Frequency
- None planned
- Point of Contact
- Contact Person
- Mark Mastin
- Delivery Point
- 1201 Pacific Ave. So., Suite 600
- City
- Tacoma
- State
- WA
- Postal Code
- 98402
- Country
- USA
- Contact Telephone
- 253-428-3600
- Contact Electronic Mail Address
- mcmastin@usgs.gov
- Native Data Set Environment
- Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.1.1.649
- Cross-Reference
- Title
- Fifty-Year Peak Flow Inundation Maps for Comayagua, Honduras
- Data Quality Information
- Attribute Accuracy Report
- Based on the vertical and horizontal accuracy of the source elevation data, LIDAR.
- Quantitative Attribute Accuracy Assessment
- Logical Consistency Report
- Topologically clean
- Completeness Report
- Complete
- Horizontal Positional Accuracy Report
- The horizontal accuracy is based on several sources of information: 1) The estimated 50-year flood discharge, which is based on a regression equation that uses drainage area and annual precipitation to estimate discharge is one source of error. The regression equation is based on 34 long-term stream gaging stations in Honduras and has a standard error of prediction of 71.3 percent. 2) The application of the one-dimensional hydraulic model (HEC-RAS) that is based on the assumption of gradually varied, steady flow is another source of error. The river is a natural channel with no known regulation, diversions, or split flows. Inaccuracies due to the model's limiting assumptions and solutions in only one dimesion are likely to be minimal. Errors in applying the model and estimating channel roughness by the hydrologist are difficult to assess, but they have been minimized through the USGS review process for publishing interpretive information. These sources will affect the horizontal accuracy in varying amounts at different locations and channel configurations.
- Quantitative Horizontal Positional Accuracy Assessment
- Lineage
- Source
- Originator
- Geological Survey (U.S.)
- Publication Date
- Unpublished Material
- Title
- Fifty-Year Peak Flow Inundation Maps for Comayagua, Honduras
- Geospatial Data Presentation Form
- map
- Series Information
- Series Name
- OFR
- Issue Identification
- 1201
- Publication Information
- Publication Place
- Tacoma, WA
- Publisher
- USGS
- Online Linkage
- http://mitchntsl.cr.usgs.gov/data/floodhazard.html
- Source Scale Denominator
- Unknown
- Type of Source Media
- online
- Contribution
- Digital elevation data.
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Vector
- Point and Vector Object Information
- SDTS Terms Description
- SDTS Point and Vector Object Type
- String
- Point and Vector Object Count
- 42
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Geographic
- Latitude Resolution
- 0.000001
- Longitude Resolution
- 0.000001
- Geographic Coordinate Units
- Decimal degrees
- Geodetic Model
- Horizontal Datum Name
- D_WGS_1984
- Ellipsoid Name
- WGS_1984
- Semi-major Axis
- 6378137.000000
- Denominator of Flattening Ratio
- 298.257224
- Entity and Attribute Information
- Entity Type
- Entity Type Label
- USGS_HO_COMAYAGUA_COMAXS
- Entity Type Definition
- cross sections
- Entity Type Definition Source
- Mark Mastin
- Attributes
- STREAM_ID
- Stream name the cross section is on (Text.)
- Definition Source
- Mark Mastin
- RCH_ID
- reach name (Text.)
- Definition Source
- Mark Mastin
- STATION
- Distance in km the cross section is from the most downstream location of the model area
- Definition Source
- HEC-geoRAS
- INTERP
- Code for the method the roughness coefficient was determined.
- n
- Manning's n
- Definition Source
- HEC-geoRAS
- PF_1
- Elevation of the water surface at the cross section in meters
- Definition Source
- HEC-geoRAS
- SHAPE
- Feature geometry. (Coordinates defining the features.)
- Definition Source
- ESRI
- SHAPE.LEN
- Length of arc in coverage units
- Definition Source
- ESRI
- SHAPE.FID
- Internal feature number. (Sequential unique whole numbers that are automatically generated.)
- Definition Source
- ESRI
- Distribution Information
- Format Name
- Shapefile
- Distributor
- Harvard Geospatial Library
- Online Access
- http://hgl.harvard.edu/
- Name
- Metadata Reference Information
- Metadata Date
- 20111205
- Metadata Contact
- Contact Information
- Contact Organization Primary
- Contact Organization
- Harvard Geospatial Library
- Contact Position
- Geospatial Resources Cataloger
- Contact Address
- Address
- Harvard University Library
- Address
- Office For Information Systems
- Address
- 90 Mount Auburn Street
- City
- Cambridge
- State or Province
- MA
- Postal Code
- 02138
- Country
- USA
- Contact Voice Telephone
- 617-495-2417
- Contact Facsimile Telephone
- 617-496-0440
- Contact Electronic Mail Address
- hgl_ref@hulmail.harvard.edu
- Hours of Service
- Monday - Friday, 9:00 am - 4:00 pm EST-USA
- Metadata Standard Name
- FGDC Content Standards for Digital Geospatial Metadata
- Metadata Standard Version
- FGDC-STD-001-1998
