Basement drainage basins

Metadata:

• Identification_Information
• Metadata_Reference_Information
• Data_Quality_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Spatial_Data_Organization_Information
• Lineage
• Spatial_Reference_Information

Identification_Information:

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Water & Environmental Research Institute (WERI), University of Guam

Contact_Position: Staff Hydrologist

Contact_Voice_Telephone: +1-671-735-2693

Citation:

Citation_Information:

Originator:

Vann, D.T., V.M. Bendixson, D.F. Roff, N.C. Habana, C.A. Simard, R.M. Schumann, and J.W. Jenson

Publication_Date: 2013

Title: Basement drainage basins

Online_Linkage: <http://www.weriguam.org/reports/list.html>

Other_Citation_Details:

Dataset is either part of or derived from the basement volcanic map titled "Topography of the Basement Rock beneath the Northern Guam Lens Aquifer and its Implications for Groundwater Explorartion and Development"

Keywords:

Theme:

Theme_Keyword: drainage basins

Theme_Keyword: volcanic basement

Theme_Keyword: Northern Guam Lens Aquifer

Theme_Keyword: NGLA

Theme_Keyword: groundwater

Theme_Keyword: hydrogeology

Theme_Keyword: flowline boundaries

Theme_Keyword: area

Place:

Place_Keyword: Guam

Place_Keyword: U.S. Territory

Place_Keyword: Mariana Islands

Place_Keyword: Micronesia

Place_Keyword: Northwest Pacific

Place_Keyword: Western Pacific

Place_Keyword: Pacific Islands

Description:

Abstract:

This dataset is part of the 2013 volcanic basement map, an update of the original 1982 map produced by the Northern Guam Lens Study (CDM, 1982). The work on updating the map utilized geophysical and drilling data to correct and refine our understanding of basement topography and improve the map; see WERI Technical Report #141 (Bendixson, 2013). Details on the methodology used, content, and applications of the map can be found in WERI Technical Report #142 (Vann et al., 2013).

Purpose:

This dataset shows the extent of the different subsurface drainage basins of the NGLA. Subsurface drainage is guided by topography of basement volcanic units that underlie the northern Guam limestone plateau.

Supplemental_Information:

Because permeability of the underlying volcanic basement rock is orders magnitude lower than that of the limestone bedrock aquifer that overlies it, the uneven topography of the basement partitions northern Guam’s aquifer into six semi-contiguous basins, each containing three groundwater zones. In the basal zone, the freshwater lens flows seaward, floating on saltwater that permeates the aquifer beneath it. Para-basal water overlies the basement rock below sea level in a zone extending from the basement sea-level contour down to the saltwater toe, past which it enters the basal zone. Patches of supra-basal water overlie parts of the flank of basement rock above sea level, where vadose water flowing downslope toward the para-basal zone may be concentrated or impounded behind topographic irregularities.

Status:

Progress: In work

Maintenance_and_Update_Frequency: As needed

Use_Constraints:

This dataset is for general information and educational purposes only and not for use in litigation. It contains no authoritative positional or other data. The Water & Environmental Research Institute (WERI) cannot assume liability for any damages or misrepresentations caused by any inaccuracies in the data or as a result of the data to be in a particular system.

Data_Set_Credit: Vann et al. (2013)

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2013

Currentness_Reference: publication date

Metadata_Reference_Information:

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Maria Kottermair

Contact_Organization: Water & Environmental Research Institute, University of Guam

Contact_Position: Research Assistant III

Contact_Electronic_Mail_Address: mariakottermair@uguamlive.uog.edu

Contact_Voice_Telephone: (671) 735-2751

Metadata_Date: 20131015

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Data_Quality_Information:

Lineage:

Process_Step:

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Maria Kottermair

Contact_Organization: Water & Environmental Research Institute, University of Guam

Contact_Position: Research Assistant III

Contact_Electronic_Mail_Address: mariakottermair@uguamlive.uog.edu

Contact_Voice_Telephone: (671) 735-2751

Process_Date: September 2013

Process_Description:

Copied outline of Northern Guam shapefile and cut it into different drainage basins by tracing the flowline (drainiage divide) polyline shapefile

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS

Title: flowlines_from_model

Geospatial_Data_Presentation_Form: shapefile

Other_Citation_Details: Draft results from model by Steven Gingerich (USGS)

Logical_Consistency_Report:

see WERI Technical Reports #141 by Bendixson (2013) and #142 by Vann et al. (2013) for detailed information.

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: basement_drainage_basins

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: Name

Attribute:

Attribute_Label: Area_ha

Attribute:

Attribute_Label: Area_ac

Attribute:

Attribute_Label: Shape_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: Shape_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Water & Environmental Research Institute, University of Guam

Spatial_Data_Organization_Information:

Point_and_Vector_Object_Information:

Lineage:

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Planar_Coordinate_Information:

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984

Ellipsoid_Name: WGS_1984