Holmberg Technologies, Inc.
7161 Brookhaven Terrace
Englewood, FL 34224
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Independent Monitoring - Summary
Click here =>Holmberg Technologies Inc. Studies Booklet
The George F. Young Co. bathymetric monitoring report of a Captiva Island, Fl. Installation found that significant accretions occurred within the project area and along adjacent shorelines both upcurrent and downcurrent from the site. No adverse impacts were associated with system performance.
Natural Systems Analysts, Inc. report on benthic life at the Captiva site found that a lifeless, high-energy shoreline exploded with new life as a result of system installation.
Long-term survey analysis by Florida State University of a Manasota Key, FL installation finds that the installation site gained an average of 20 feet of beach width per year post installation. Approximately 1 million cubic yards of sand has accreted in the project area and along adjacent shorelines during the first nine years after installation.
A long-term study of system performance at various locations by geologist as Western Michigan University shows positive results. The geologists have determined that the system causes "consistent profile gain" when compared to a "regional trend of profile volume loss (on untreated shorelines) with significant foreshore/backshore (beach) accretion with no apparent negative impact." The study notes that "a number of (larger) installations have caused dramatic positive results." The University summarizes, "beach accretion with no apparent negative impact down drift must be viewed as 'success' in almost any context."
A formal assessment of system performance was conducted by the WBDC Group, a civil engineering firm, for a coastal community impacted by erosion. WBDC compared the technology with other approaches, primarily beach dredging and coastal armor. Undercurrent Stabilizer Technology was rated best by an overwhelmingly wide margin. The community has since installed the technology and restored their shoreline.
Sandell, Chappell & Schultz, P.C., hydraulic engineers, performed long-term survey analysis of a community system placed downcurrent of a large Federal navigation channel. The report notes that the system has been "effective in halting and reversing recession rates and material losses" along a mile of shoreline that had been experiencing high rates of erosion and the loss of seafront homes.
Sandell, Chappell and Shultz have analyzed a number of other Undercurrent Stabilizer Installations. The firm notes that the system acts "as energy dissipators instead of energy amplifiers, as do conventional erosion control structures...all locations show evidence of improvement, with no evidence of adjacent adverse impacts...most of the Stabilizers have become buried...Any man-made shore protection structure that closely mimics the natural beach system will be more successful in retaining a safe, healthy and usable beach."
The U.S. Army Corps of Engineers has permitted approximately 100 installations of the technology to date. The Corps reports that restoration induced by the system "does not appear to have caused any erosion to the adjacent properties."
Of the roughly 100 installations of Undercurrent Stabilizer Technology to date, ten have been funded by government agencies. In addition to formal monitoring by independent companies and university, numerous agencies such as the Army Corps and the U.S. Geological survey have observed system performance over the years. The system is unique for coastal structures in that benefits induced in one area are not accompanied by adverse side effects to adjacent shorelines. In fact, monitoring reveals that adjacent shorelines benefit from the "feeder" beaches associated with system installations.
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