Identification_Information: Citation: Citation_Information: Originator: Roy S. Sonenshein Publication_Date: 2001 Title: Evaluation of Methods to Determine Ground-water Seepage Below Levee 30, Miami-Dade County Florida Geospatial_Data_Presentation_Form: text files Online_Linkage: http://sofia.usgs.gov/projects/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, DC, 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, DC, 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: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 3110 SW 9th Avenue City: Ft. Lauderdale State_or_Province: FL Postal_Code: 33315 Country: USA Contact_Voice_Telephone: 954 377-5924 Contact_Electronic_Mail_Address: sunshine@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://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: http://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 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: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 3110 SW 9th Avenue City: Ft. Lauderdale State_or_Province: FL Postal_Code: 33315 Country: USA Contact_Voice_Telephone: 954 377-5924 Contact_Electronic_Mail_Address: sunshine@usgs.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: Levee 30 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: http://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: Levee 30 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: http://sofia.usgs.gov/exchange/sonenshein/sonensheinelev.html Access_Instructions: Data may be downloaded from the SOFIA website Fees: none Metadata_Reference_Information: Metadata_Date: 20070216 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