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Evaluation of Methods to Determine Ground-water Seepage Beneath Levee 30, Miami-Dade County Florida

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Roy S. Sonenshein
Publication_Date: 2001
Title:
Evaluation of Methods to Determine Ground-water Seepage Beneath Levee 30, Miami-Dade County Florida
Geospatial_Data_Presentation_Form: text files
Online_Linkage: <https://sofia.usgs.gov/projects/index.php?project_url=levee_30>
Description:
Abstract:
Ground-water flow models were developed to calculate a water budget, including seepage losses, for a transect perpendicular to Levee 30. Data required for input to and calibration of the models were obtained from: (1) previous studies conducted in the area, (2) analysis of a geologic core and geophysical logs from a new monitor well drilled along the transect, (3) ground-water-level data from monitor wells along the transect, (4) surface-water-stage data in Water Conservation Area 3B and in the Levee 30 canal, (5) discharge measurement made at several locations under varying conditions in the Levee 30 canal, and (6) vertical seepage fluxes between surfacewater and groundwater in Water Conservation Area 3B obtained from seepage meters.
Purpose:
Determining the volume of water seeping from the water-conservation areas to the underlying aquifers is important in managing water levels in the conservation areas and freshwater deliveries to Everglades National Park. An accurate water budget to meet the competing natural and anthropogenic needs cannot be determined without this information. From Water Conservation Area 3B, water seeps into the Biscayne aquifer, which is about 80 feet thick directly beneath Levee 30 and thickens to the east, and flows relatively fast (due to high permeability of the aquifer) toward the urban and agricultural areas to the east. Water is also discharged to the canal along the eastern part of Levee 30. The rate of discharge is controlled by structures at the northern and southern ends of the canal. This seepage to the aquifer and canal discharge of water are critical for water-supply wells to the east and for preventing the inland movement of saltwater from the coast. However, lowering of ground-water levels to the east has resulted in higher ground-water seepage and canal discharge, reducing flows to the south in the water-conservation area. As a result, Levees 67A and 67C were constructed to direct water southward toward the central region of Everglades National Park. This water-management scheme has been effective in delivering water to the southwest; however, it reduced the flow to the southeast (northeastern part of Everglades National Park). The altering of historical flow directions and water-level durations has caused significant adverse effects to parts of the Everglades ecosystem. Water managers want to restore predevelopment flow conditions for the Everglades to survive, while also taking into consideration the urban and agricultural needs.

The objective of this project was to evaluate approaches for quantifying ground-water seepage beneath Levee 30. The accounting of all significant hydrologic inflows and outflows to the Everglades ecosystem of the south Florida mainland is a key element of the South Florida Ecosystem Program.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19960201
Ending_Date: 19961217
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -80.3
East_Bounding_Coordinate: -80.29
North_Bounding_Coordinate: 25.85
South_Bounding_Coordinate: 25.85
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: surface water
Theme_Keyword: seepage
Theme_Keyword: numerical flow models
Theme_Keyword: groundwater
Theme_Keyword: hydrology
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: inlandWaters
Theme_Keyword: 007
Theme_Keyword: 012
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, D.C., National Institute of Standards and Technology
Place_Keyword: United States
Place_Keyword: US
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, D. C., NIST
Place_Keyword: Florida
Place_Keyword: FL
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology
Place_Keyword: Miami-Dade County
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Levee 30
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: South East Coast
Place_Keyword: Water Conservation Area 3B
Place_Keyword: WCA3B
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Roy Sonenshein
Contact_Organization: National Park Service
Contact_Address:
Address_Type: mailing and physical address
Address:
Everglades NP

950 Krome Ave., 3rd floor

City: Homestead
State_or_Province: FL
Postal_Code: 33030
Country: USA
Contact_Voice_Telephone: 305 224-4250
Contact_Facsimile_Telephone: 305 224-4147
Contact_Electronic_Mail_Address: roy.sonenshein@nps.gov
Browse_Graphic:
Browse_Graphic_File_Name: <https://sofia.usgs.gov/publications/fs/132-96/#fig1>
Browse_Graphic_File_Description: location of study area
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: <https://sofia.usgs.gov/exchange/sonenshein/locationelev.html>
Browse_Graphic_File_Description: Water Level Parameter Data Location Map
Browse_Graphic_File_Type: GIF
Native_Data_Set_Environment:
Station location and description, and period of record data are stored for each sampling location in the USGS NWIS database. The data are on the SOFIA website in tab-delinited text files for the daily and unit values for each site.
Cross_Reference:
Citation_Information:
Originator: Sonenshein, R. S.
Publication_Date: 2001
Title:
Methods to Quantify Seepage beneath Levee 30, Miami-Dade County, Florida
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Water-Resources Investigations Report
Issue_Identification: WRIR 01-4074
Publication_Information:
Publication_Place: Tallahassee, Fl
Publisher: U.S. Geological Survey
Other_Citation_Details: accessed as of 12/13/2010
Online_Linkage: <http://fl.water.usgs.gov/Abstracts/wri01_4074_sonenshein.html>

Data_Quality_Information:
Logical_Consistency_Report: not applicable
Completeness_Report: Missing values are indicated by blanks in the text files
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: Spatial accuracy determined by GPS
Lineage:
Process_Step:
Process_Description:
Ground-water flow models were developed to calculate a water budget, including seepage losses, for a transect perpendicular to Levee 30. Twenty-one continuous recording, ground-water-level monitor wells were installed along the transect, running about 500 feet both east and west of Levee 30. The wells are located in six different clusters where each cluster has two to five wells, with depths ranging from 10 to 80 feet below land surface. Continuous surface-water-level (stage) recorders were also installed along the transect, one in Water Conservation Area 3B and one in the Levee 30 canal. Data were collected for about 1 year to obtain information for both wet- and dry-season conditions. The data were used to select boundary conditions for the ground-water flow models and to calibrate the models. Data collection began in February 1996 and ended in December 1996.

A continuous geologic core from land surface to a depth of 78 feet was obtained during the drilling of a monitor well completed in February 1995. Permeability and porosity tests were performed on 10 plugs from the core. Of particular interest was a thin, very hard, impermeable limestone layer at 7 feet below land surface with a very low porosity (less than 5 percent) and very low permeability (less than 0.001 millidarcy). This layer is believed to be areally extensive and, therefore, would constitute a semiconfining layer retarding the seepage of water from Water Conservation Area 3B into the underlying Biscayne aquifer.

Geophysical logs were obtained from two monitor wells using electromagnetic induction and natural gamma tools. The resulting logs are useful for determining changes in rock types and water quality.

Discharge measurements were made in the Levee 30 canal under various hydrologic conditions at three locations: at the transect, 1 mile south of the transect, and 1 mile north of the transect. The differences in flow rates at these three sections are used to determine the rate at which water is seeping into or out of the canal from the aquifer, a critical input requirement for the ground-water flow models.

At two sites in the wetlands, seepage meters were used to directly measure the flux of water across the water-sediment interface. Measurements were made under varying hydrologic conditions.

Process_Date: 1996
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Roy Sonenshein
Contact_Organization: National Park Service
Contact_Address:
Address_Type: mailing and physical address
Address:
Everglades NP

950 Krome Ave., 3rd floor

City: Homestead
State_or_Province: FL
Postal_Code: 33030
Country: USA
Contact_Voice_Telephone: 305 224-4250
Contact_Facsimile_Telephone: 305 224-4147
Contact_Electronic_Mail_Address: roy.sonenshein@nps.gov

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Levee 30

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 1
Longitude_Resolution: 1
Geographic_Coordinate_Units: Degrees, minutes, and decimal seconds
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Mean sea level
Depth_Resolution: 1.0
Depth_Distance_Units: feet
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather S. Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth St. South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: hhenkel@usgs.gov
Resource_Description: Daily Values
Distribution_Liability: The data have no implied or explicit guarantees
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Version_Number: unlnown
Format_Specification: tab-delimited text file
Transfer_Size: 0.04
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://sofia.usgs.gov/exchange/sonenshein/sonensheinelev.html>
Access_Instructions: Data may be downloaded from the SOFIA website
Fees: none

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather S. Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth St. South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: hhenkel@usgs.gov
Resource_Description: Unit Values
Distribution_Liability: The data have no implied or explicit guarantees.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Version_Number: unknown
Format_Specification: tab-delimited text file
Transfer_Size: 1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://sofia.usgs.gov/exchange/sonenshein/sonensheinelev.html>
Access_Instructions: Data may be downloaded from the SOFIA website
Fees: none

Metadata_Reference_Information:
Metadata_Date: 20101213
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints:
This metadata record may have been copied from the SOFIA website and may not be the most recent version. Please check <https://sofia.usgs.gov/metadata> to be sure you have the most recent version.

This page is <https://sofia.usgs.gov/metadata/sflwww/metroys.html>

U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.8.18 on Mon Dec 13 15:52:20 2010