rsl30uv - Levee 30 Seepage Unit Values

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Roy S. Sonenshein

Publication_Date: unpublished material

Title: rsl30uv - Levee 30 Seepage Unit Values

Online_Linkage: <http://sofia.usgs.gov/exchange/sonenshein/sonensheinelev.html>

Description:

Abstract:

This data set contains hourly readings for water level elevation in feet above mean sea level(feet msl) for 21 groundwater wells and stage in feet msl for 2 surface water stations for 1996 along a transect, approximately 1,000 feet long that is perpendicular to and bisected by Levee 30.

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: 19961216

Currentness_Reference: ground condition

Status:

Progress: complete

Maintenance_and_Update_Frequency: none planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -80.49

East_Bounding_Coordinate: -80.48

North_Bounding_Coordinate: 25.86

South_Bounding_Coordinate: 25.86

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: groundwater

Theme_Keyword: surfacewater

Theme_Keyword: seepage

Theme_Keyword: numerical flow models

Theme_Keyword: hydrology

Theme_Keyword: stage

Theme_Keyword: water level

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: South East Coast

Place_Keyword: Dade County

Place_Keyword: Water Conservation Area 3B

Place_Keyword: Levee 30

Place_Keyword: G-3579

Place_Keyword: G-3580

Place_Keyword: G-3581

Place_Keyword: G-3582

Place_Keyword: G-3583

Place_Keyword: G-3584

Place_Keyword: G-3585

Place_Keyword: G-3586

Place_Keyword: G-3587

Place_Keyword: G-3588

Place_Keyword: G-3589

Place_Keyword: G-3590

Place_Keyword: G-3591

Place_Keyword: G-3592

Place_Keyword: G-3593

Place_Keyword: G-3594

Place_Keyword: G-3595

Place_Keyword: G-3596

Place_Keyword: G-3597

Place_Keyword: G-3598

Place_Keyword: G-3599

Place_Keyword: Levee 30 canal 7 mi. N of trail nr Coopertown

Place_Keyword: Wetland site at L30 in WCA3B nr Coopertown

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: daily

Temporal_Keyword: hourly

Access_Constraints: None.

Use_Constraints:

These data are subject to change and are not citable until reviewed and approved for official publication by the USGS

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Roy S. Sonenshein

Contact_Organization: U.S. Geological Survey

Contact_Position: Project Chief

Contact_Address:

Address_Type: mailing address

Address: 9100 NW 36th Street Suite 107

City: Miami

State_or_Province: FL

Postal_Code: 33178

Country: USA

Contact_Voice_Telephone: 305 717 5824

Contact_Facsimile_Telephone: 305 717 5801

Contact_Electronic_Mail_Address: sunshine@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name: <http://sofia.usgs.gov/exchange/sonenshein/locationelev.html>

Browse_Graphic_File_Description:

transect showing well, recorder and meter locations surface-water-level (stage) locations

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

Data_Quality_Information:

Logical_Consistency_Report: not applicable

Completeness_Report: not applicable

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: not available

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: unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Roy S. Sonenshein

Contact_Organization: U.S. Geological Survey

Contact_Position: Project Chief

Contact_Address:

Address_Type: mailing address

Address: 9100 NW 36th Street Suite 107

City: Miami

State_or_Province: FL

Postal_Code: 33178

Country: USA

Contact_Voice_Telephone: 305 717 5824

Contact_Facsimile_Telephone: 305 717 5801

Contact_Electronic_Mail_Address: sunshine@usgs.gov

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Levees 30 and 31N

Direct_Spatial_Reference_Method: Point

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 23

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Roy Sonenshein

Contact_Position: Database Manager

Contact_Address:

Address_Type: mailing address

Address:

9100 NW 36th Street Suite 107

City: Miami

State_or_Province: FL

Postal_Code: 33178

Country: USA

Contact_Voice_Telephone: 305 717-5824

Contact_Facsimile_Telephone: 305 717-5801

Contact_Electronic_Mail_Address: sunshine@usgs.gov

Resource_Description: Levee 30 unit values

Distribution_Liability: The data have no implied or explicit guarantees

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://sofia.usgs.gov/exchange/sonenshein/sonensheinelev.html>

Access_Instructions: Log onto the SOFIA web site at <http://sofia.usgs.gov>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20000318

Metadata_Review_Date:

Metadata_Future_Review_Date:

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jo Anne Stapleton

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing address

Address: 521 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 703 648 4592

Contact_Facsimile_Telephone: 703 648 4614

Contact_Electronic_Mail_Address: jastapleton@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
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