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KOBELCO Kobe Steel Group

Slope Protection

High Joule Net for Debris Flow

High Joule Net (debris flow)
NETIS Registration Number QS-080010-V

In order to prevent disasters caused by debris flow, many of which have occurred in recent years, we developed a High Joule Net for debris flow by adapting the High Joule Net system originally created to capture falling rocks.


  • The fallen earth and sand are captured by the strong and flexible cable net.

  • Wire mesh keeps the amount of escaping earth and sand to a minimum.

  • The length of the anchors is calculated based on experiment data conforming to ground conditions.

  • The fence height and the support interval are designed depending on debris flow conditions.

  • There is no need to build an extensive foundation on the slope face.

3 types (200 kN/m2, 150 kN/m2, and 100 kN/m2) depending on the impact of the debris flow are available.

Model name Effective fence height (m) Impact force
(kN/m2) (t/m2)
HJD‐200 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0 200 20
HJD‐150 150 15
HJD‐100 100 10

Energy absorption system

While the entire fence system works to absorb energy, the main components that absorb energy from debris flow are the cable net and wire mesh, and the brake elements that are attached to retention cables and the supports at either end of the net.

Energy absorption system

Enlarged view of energy absorption system

  • Full-size experiment Full-size experiment
  • Captured debris flow Captured debris flow