Fload and coastal protection

Integral flood protection concept for the Werra between Harras and Vacha and for the lock below the Schönbrunn dam to the mouth of the Werra

Hochwasserschutzkonzept Werra

The Werra and the lock are classified as 1st order watercourses and are therefore under the maintenance responsibility of the Free State of Thuringia. An integral flood protection concept (i-HWSK) is to be drawn up for the above-mentioned watercourse sections. As part of the i-HWSK, deficits in flood protection are identified and named. Based on the deficits identified, optimised solution proposals are developed for those affected. Finally, the proposed solutions are used to develop variants for improving flood protection. Based on the results of a multicriteria evaluation, a preferred variant is recommended.

In contrast to the HWSK, the i-HWSK not only concentrates on technical measures, but also takes equal account of the other areas of action of flood risk management, in particular natural water retention, land and building prevention, information, behaviour and risk prevention as well as hazard prevention and disaster control.

In addition, all proposed structural measures will be analysed with regard to interactions with measures for the implementation of the EC Water Framework Directive.

As this is the first integral flood protection concept for the Thuringian State Office for the Environment, Mining and Nature Conservation, new methods were also developed, e.g. for determining the retention volume of a natural floodplain or for evaluating flood protection measures.

Client: Thüringer Landesamt für Umwelt, Bergbau und Naturschutz

Processing period: 2016 – 2022

Main data:
Werra section: approx. 125 km
Lock section: approx. 24.5 km
Total size of the models: approx. 80 km²

Coordination of surveying services
On-site inspection
Creation of the calculation meshes
Model calibration and plausibility check
Stationary and transient 2D hydronumerical calculations for the ACTUAL state and the PLAN states, including evaluation, assessment and GIS-based processing of the results
Deficit analysis in relation to flood protection
Survey of the municipalities and districts
Planning of measures and creation of variants
Cost-benefit analysis
Value-benefit analysis, derivation of a preferred solution
Consideration of the requirements of the Water Framework Directive and inclusion of flood prevention and disaster control measures
Participation in public relations work