Severe scouring occurred at the Eider storm surge barrier, progressing towards the structure. Due to depth, steepness and tidal currents, traditional coastal protection systems were out of question, but further scouring had to be stopped. A system of filter, stone fill and armour layer was chosen. To avoid segregation of the broadly graded granular filter material, it was dumped in nonwoven geotextile containers. Selection of the materials, design of the filters and placement turned out to be rather difficult. The combination of geotextile and granular filter solved the problem.
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