The wave length L was calculated with the measured wave celerity c and wave period T as L¼cT. The investigated impulse waves at CWG1 were in the range 5.1rL/hr82.7 and intermediate- to shallow-water waves, therefore. The primary wave was in 95% equal to the maximum wave. About 90% of the generated maximum waves were in the intermediate-water wave range. Further, the Ursell parameter at CWG1 was in the range 2.7rUr10340. Linear waves with U-0 were not observed. The herein investigated impulse waves may therefore be characterized as nonlinear, intermediate- to shallow-water waves with small to considerable fluid mass transport. The maximum waves were allocated to the Table 2