The KRISMER® system is particularly suited for combating hydraulic erosion along river banks, dikes in the case of overflow and internal erosion or “piping”.
It consists of three-dimensional galvanized steel panels which are nailed to the soil with special anchor rods and then filled with aggregates, top soil and sown according to requirements. Following the establishment of new seedlings the roots of the ground cover also reduce soil erosion. The aggregates serve as a drainage system, thereby reducing hydrostatic pressure on the back of the KRISMER® system during flash floods.
The KRISMER® system can be installed on the embankments of steep dikes to reduce ground coverage. Installation is fast and easy. No major earthworks are required and the system blends perfectly into the landscape.
Overall performance of the system is comparable to other, more complicated systems. Laboratory tests and full-scale field feedback have proved the performance of the KRISMER system during floods.
Protection of river banks against flooding
When installed above the water line, the KRISMER system serves a protection against hydraulic erosion in the case of water rising or flooding (waterflow is tangential in relation with the KRISMER system).
The KRISMER system can also be installed on the banks of lakes or reservoirs to ensure the protection of the banks during water drawdown.
Dike overflow protection
The KRISMER® system is particularly resistant when it is installed on the invert of a spillway (waterflow parallel to the KRISMER® system). Indeed, the system can withstand severe hydraulic constraints, reducing thereby the risk of scouring at the top and bottom of the dike. This type of configuration prevents a dike from braking in the case of flooding.
Internal erosion due to “piping”
“Piping” occurs in non-watertight dikes subjected to water infiltration when the water level rises. When infiltrated into the dike, the water begins to shift the materials embedded in the core of the dike. The result is a major risk of erosion that can cause the dike to break. In this configuration, a -nonwoven geotextile is placed below the KRISMER® panels prior to installation of the panels to prevent the materials from migrating. The system is anchored to the embankment with special nails, filled with aggregates and a thick layer of topsoil. The mass of the KRISMER® system filled with aggregates and the nails ensure that the embankment is mechanically secured against the risk of leakage within the core of the dike.
Full-scale tests were conducted in the laboratories of “Institute of Hydraulic Engineering and Water Resource Management” of the University of Vienna (Institut für Wasserbau und Ingenieurhydrologie, TU Wien). The aim of these tests was to evaluate the performance of the KRISMER® system by reproducing the natural constraints applied to river banks.
AVAROC recommends EURO-TEC company for the greening of the KRISMER® System.
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