TS-DC Gully Net

Area of Application

The TS-DC Gully Net is a debris flow barrier designed for sites with confined flows such as in gullies or debris torrents. Unlike prefabricated systems used for rockfall mitigation, debris flow barriers must always be designed on a site-to-site basis to account for the highly variable characteristics of debris flow processes and their interaction with site topography.

Lateral Anchorage

Anchors for the bearing and middle ropes are installed directly into the steep sides of the gully. Either bar anchors or cable anchors can be used. In the case of very poor anchoring conditions, artificial embankments may be constructed to help limit erosion and scouring.

Double Rope System

A double rope system is used to ensure the net remains as close to the edge embankments as possible while allowing the brake elements to expand. In this case, a brake element is fitted to opposing sides of the ropes. The side with the brake element, is not threaded through the leading net panel.

Overflow Abrasion Protection

For systems where overflow is anticipated and abrasion is an issue, steel profiles can be added to help protect the upper bearing rope set. The plates cover both the ropes and the upper edge of the net and are installed during the final stages of construction.

AVT-phx Brake Element

The AVT-phx series of brake elements are steel coils that unravel when a force is applied. The gauge, width and number of coils can be specified in order to control the amount of energy absorbed and the total displacement. With no moving parts, these are some of the safest and most reliable brakes in the industry.
ModelTS-DC Gully Net
StyleLateral Anchored
Impact Pressure
up to 150
Available Heights
[m (ft)]
up to 7.5
Primary Net
ModelOmega-Net 7.5/135Omega-Net 9.0/185Omega-Net 10.5/180
TypeSteel Wire CableSteel Wire CableSteel Wire Cable
Rope Diameter
[mm (inch)]
Rope Construction1 x 7 Spiral1 x 7 Spiral1 x 19 Spiral
Single Wire Diameter
[mm (inch)]
Corrosion ProtectionZn/ZnAl (Class A)Zn/ZnAl (Class A)ZnAl (Class A)
Mesh Size
[mm (inch)]
135 x 135
(5.3 x 5.3)
185 x 185
(7.3 x 7.3)
180 x 180
(7.1 x 7.1)
Unit Weight
Mesh Tensile Strength
calculated [kN/m (lbf/ft)]
Connection to Main RopesThreadedThreadedThreaded
Connection to Adjacent Panel3/8" Shackle7/16" Shackle1/2" Shackle

The primary net material used in Trumer systems is called the Omega-Net. It is a steel cable net made from spiral rope that has thick individual wires to resist abrasion. The strands of rope are pre-bent into arcs resembling an omega shape and then woven together to make the net. This process yields an extremely strong net with high flexibility and energy absorption characteristics.

Bearing Ropes
per fence segment
(two upper, two lower)
Max. Rope Diameter
[mm (inch)]
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Element
per rope
Brake Element TypeAVT-phx
Middle Ropes
per fence segment
site dependent
(sets of two)
Max. Rope Diameter
[mm (inch)]
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Element
per rope
Brake Element TypeAVT-phx
Lateral Anchorage
1.Upper Bearing Rope; 2.Lower Bearing Rope; 3.Middle Bearing Rope; 4.Brake Element; 5.Anchor Eye; 6.Anchor
Seam Connection
1.Shackle; 2.Sewing Rope 3.Net border rope
Typical Layout
1.Upper Bearing Rope; 2.Lower Bearing Rope; 3.Middle Bearing Rope; 4.Lateral Anchor

NOTE: All data is taken from an example of an existing project. Every debris flow structure is custom designed for a specific site and loading conditions and so the exact details of the system will very from site to site. This is an important aspect of debris flow mitigation since standardized (e.g. CE marked systems) cannot address site specific requirements.