This thesis analyses soil bioengineering constructions in two parts of the Moedlingbach in the municipality of Moedling / Lower Austria. Since the year 2000 students of the University of Bodenkultur (University of Natural Resources and Applied Life Sciences, Vienna) and the Regional Service of Hydraulic Engineering of the provincial government of Lower Austria in cooperation with the municipality of Mödling have carried out restructuring work, which consisted of breaking open the sealed low water-bed and of introducing measures of renaturation and flood control. Two years after the live proyers, fascines, wattle fences and pile walls had been finished, the condition, effect, and vitality of the willows used, were examined. Furthermore, the condition of the structure of the riverbed was investigated by measuring the depths in cross profiles. On average the analyses show a very good condition of the constructions and their satisfactory effects. Vegetation has developed very well and offers positive ecological and aesthetic aspects aside from controlling floods. The cross profiles show an increase of different structures a river produces, such as scourings and fords. Generally speaking these restructuring works have proved very successful. Small additions to these works are necessary and minor improvements or alternatives are possible.