Geotechnical Drilling Program

To keep the levees accredited within FEMA’s National Flood Insurance Program (see the Levee Accreditation page for more information), the Drainage District must investigate the current condition of the levee system. To do this, staff and engineering consultants are compiling existing information and gathering new data on the current condition of the levee system. This information will be used to identify possible deficiencies.

The first step in the investigation is to conduct an above ground survey of the the levee systems, and identify all structures and vegetation within the levee right of way. This effort has been completed for PEN 1 and PEN 2. The next step is to explore the conditions of the levees beneath the surface.  To do this, the Drainage District must drill boreholes and remove soil samples at periodic intervals along the levee system, in some cases within the levee itself and in others on nearby land.

Drill Rig

 

The geotechnical engineering consultants that will be evaluating the levee for accreditation identified around 135 boring locations in the PEN 1 and PEN 2 districts.  At nearly all these locations, a drilling contractor drilled holes less than 8 inches in diameter, from 20 to 100 feet deep.  The drilling work fell within public rights of way and on private property. The Districts entered into access agreements or obtained permits with each impacted property owner or easement holder before beginning work.

To see approximately where this work occurred, look at the interactive map below. (Please allow a few moments for the map to load.)  On the map you can see closest address and the approximate date for work at each proposed boring location. Zoom in for detail.


Map produced by FLO Analytics for MCDD – 2014

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