1. Hydraulic Engineer, Hetzer, Jäckli und Partner AG, CH-8610 Uster, Switzerland; formerly, VAW, ETH Zürich, CH-8093 Zürich, Switzerland. (corresponding author).
2. Head of Hydraulic Structures Division, VAW, ETH Zürich, CH-8093 Zürich, Switzerland.
3. Professor, VAW, ETH Zürich, CH-8093 Zürich, Switzerland.
4. Professor, Director VAW, ETH Zürich, CH-8093 Zürich, Switzerland.