Thursday, 19 July 2007

Some more information about Holmberg Technologies

Holmberg Technologies Inc.
Undercurrent Stabilizer™ System
A Proven Alternative Coastal Erosion Management Solution

Globally, the issue of how to effectively manage coastal erosion is of increasing concern to those who have an interest in the conservation of our precious coastal environment.

Over thirty years ago, Dick Holmberg, a visionary environmentalist, with a unique understanding of the oceans’ behavior gained from his experience as a deep-sea diver, became concerned about coastal erosion and the shortcomings of the methods that were being used to manage the problem. He responded by pioneering the development of an alternative coastal erosion management solution – the Undercurrent Stabilizer™ system.

To-date, Dick Holmberg’s company - Holmberg Technologies, Inc.- has applied Undercurrent Stabilizer™ systems to successfully manage coastal erosion in over 100 projects, responding to a wide range of site characteristics and objectives for clients that have included government, community and private interests.

In contrast to traditional approaches to erosion management, such as rock walls, groynes, artificial reefs and sand replenishment, Holmberg Technologies’ Undercurrent Stabilizer™ systems derive their success from working with nature, rather than against nature, to facilitate the reconstruction of a permanently self-sustaining shoreline environment.

A significant benefit of the Undercurrent Stabilizer™ system is that because it is a permanent self-sustaining solution, installations typically involve a once-only cost for assessment, design and construction. In most cases ongoing maintenance costs normally associated with traditional solutions are eliminated. At around US$2 million per mile Undercurrent Stabilizer™ systems are significantly cost-effective when compared to traditional solutions.

Often described as seabed speed bumps, Undercurrent Stabilizer™ systems are designed to slow sediment (e.g. sand or gravel) laden currents, to halt erosion and induce accretion.

Undercurrent Stabilizer™ systems successfully reduce wave energy and current velocities forcing the precipitation of indigenous sediment onto the shore. This reduction in velocity and hydraulic energy also reduces transport of sediment from the shore. The technology restores and protects the near-shore as well as facilitating the restoration and conservation of dunes and bluffs without interfering with the outer surf zone. The technology remains in place providing solid underpinning which facilitates storm protection.

Provided an initial feasibility study proves to be positive, an Undercurrent Stabilizer™ system is custom designed to address site-specific conditions, characteristics and performance objectives.

The system typically includes a geo-mass template designed to re-contour a deficit near-shore profile (one that loses sand) into a shallow, gently sloping accretion profile (one that gains sand). Each system is an interlocked network of concrete filled geo-textile tubes that extend like long “fingers” perpendicular to the coastline and sometimes incorporates a shore parallel component (especially where bluff or dune undercutting by wave action is possible).

Once installed, the technology follows the slope of the beach and near-shore and disappears completely out of sight, as the beach-face and near-shore accretes.
The effectiveness of Holmberg Technologies’ approach to coastal erosion management has been verified by independent scientific and technical studies and supported by international university research, as well as by thirty years of empirical evidence.

For more information visit: and
In Australia or New Zealand contact:
Chris Johnson, BBS. Australasian Representative, T/F 00-64(9)-5358066 – Email:



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