L-31N (L-30) Seepage Management Pilot
The initial purpose of the L-31N Levee Improvements feature was to reduce levee seepage flow across L-31N adjacent to Everglades National Park (ENP) via a levee cutoff wall. Additionally, the feature was to reduce groundwater flows during the wet season, by capturing groundwater in a series of groundwater wells adjacent to L-31N, then back-pumping those flows to ENP.
After further study of the L-31N site, it was determined that a seepage management feature in this location might be rendered obsolete with implementation of the full-scale ENP Seepage Management project. The USACE Jacksonville District proposed further study for a feature located along a portion of the L-30 levee, north of U.S. Highway 41, in Miami-Dade County, Florida.
The L-31N (L-30) Seepage Management Pilot Project will help resolve critical uncertainties associated with seepage management. These include the characterization of the Biscayne aquifer hydrodynamics, constructability in south Florida geology, reliability of materials and technologies, implementability of a seasonally flexible operating system, appropriateness of monitoring to evaluate effects on seepage, and cost and time requirements necessary for implementation. The pilot will also help answer questions on overall effectiveness of seepage management technologies. The recommended plan will test two structural seepage reduction technologies (steel sheet pile and slurry wall), and test the ability to seasonally manage seepage flows through pumping operations with the use of extraction and injection wells. Field tests, seepage reports and historical data independently showed that this is one of the most transmissive parts of the Biscayne Aquifer.
- View the June 2010 Revised FONSI (725 kb, PDF)
- View the final PPDR/EA for this project (May 2009)
- View the Fact Sheet for L-31N (L-30) Seepage Management Pilot
- View the project management plan for this project
- View the current project status report (PDF)
- View other project documents for this project
U.S. Army Corps of Engineers:
Tim Brown, Project Manager
Robert Verrastro, Project Manager
|Project Sponsor:||South Florida Water Management District|
|Project Schedule:||For scheduling information regarding this project, please see the Master Implementation Sequencing Plan (MISP).|
|Project Phase:||Pre-Construction, Engineering and Design|
|Design Agreement:||12 May 2000|
|CERP Component Designation:||Pilot|
|Project Partnership Agreement:|
|Authorization:||WRDA 2000 (Authorized Pilot)|