The L-31 North Canal Seepage Management Pilot Project is intended to curtail easterly seepage emanating from within Everglades National Park (ENP). The pilot project is examining various seepage management technologies as well as operational changes that could be implemented to reduce the water losses from ENP. This project is in close proximity to Biscayne Bay so an effort has been made to combine ongoing work efforts at the two project areas. The distribution of seepage into the L-31 North Canal and beneath it is not known with any degree of certainty today. A canal draw down experiment was conducted to provide additional field data that will be utilized to refine seepage estimates in the study area as well as determine aquifer parameters in the study area.
Carlson, Janine L.; Wingard, G. Lynn; Robinson, Edward; Wacker, Michael A.
Prepared in cooperation with the South Florida Water Management District
Wacker, Michael A.; Robinson, Edward; Gefvert, Cynthia J.; Krupa, Steven L.
Prior to completion of the wells, the USGS completed geophysical logging of the wells. The USGS hydrogeologist was on site while the drilling crew developed monitoring wells 9A and 11A for logging and during geophysical borehole logging of the deepest well at each of the two monitor wells. The site USGS hydrogeologist (1) monitored the drilling contractor for adherence to correct borehole development and preparation for geophysical borehole logging; (2) ran geophysical logs, digital-image logs,video logs, flowmeter measurements; and (3) provided calculated computed vuggy-porosity logs.
The distribution of seepage into the L-31 North Canal and beneath it is not known with any degree of certainty today. A canal draw down experiment was proposed to provide additional field data that will be utilized to refne seepage estimates in the study area as well as determine aquifer parameters in the study area. The canal drawdown experiment was scheduled to be completed in two phases. A dry-season test would be conducted toward the end of May 2004 and a wet-season test was scheduled for late July 2004. Both portions of the test were planned for at least four days duration. During the test multiple sets of hydrologic instrumentation were to be monitored on a continual basis. In addition, during the dry-season test, downhole flow logging would be completed in two open-hole interval wells adjacent to the L31N Canal.
The USGS was to acquire geophysical logs using the fluid conductivity and temperature probes, and heat-pulse and spinner flowmeters at two coreholes specified by the Corps of Engineers. The two coreholes would be logged during the second day of the 48-hour duration of the drawdown test. The drawdown test was scheduled for late May or early June 2004 during dry-season conditions.
USGS well names are G3801 and G3802. The numbers assigned by USACE or SFWMD are 9A and 11A respectively.
U.S. Department of the Interior, U.S. Geological Survey
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