Flood Protection River Langete and Tributaries
Following the floods in 2007 three communities Huttwil, Rohrbach und Madiswil decided to jointly tackle flood protection. The aim is to implement coordinated measures in the three communities step-by-step while optimising costs. The measures include constructing two flood control reservoirs, expansion of a side channel and a driftwood screen. The flood control reservoirs and the expansion of the side channel are designed based on a protection goal of HQ100 .
Main Data
Flood control reservoir Brand (unregulated):
- Retention capacity: 120,000 m3
- Retention effects: HQ100 = 79 m3/s, HQ100,Retent. = 52 m3/s
- Design-basis flood: QB = 160 m3/s
- Probable maximum flood: QS = 240 m3/s
Flood control reservoir Tschäppel (unregulated):
- Retention capacity: 100,000 m3
- Retention effects: HQ100 = 30 m3/s, HQ100,Retent. = 12 m3/s
- Design-basis flood: QB = 60 m3/s
- Probable masimum flood: QS = 90 m3/s
Side channel expansion:
- Numerous coordinated defence measures (raising level of banks, ground modelling, bridge adjustments, etc.), which were developed in consultation with the landowners
- Numerous coordinated defence measures (raising level of banks)
- Length of channel: 100,000 m3
Client
Municipalities Huttwil, Rohrbach and Madiswil
Consultant
IUB Engineering AG in Consortium
Construction period
2013–2015
Construction costs
CHF 13.7 million
Scope of services
- Construction project
- Approval process
- Tendering