Tsunami flow velocity on land is important for estimating tsunami load on structures. Numerical simulation is widely used to estimate tsunami load with flow velocity estimation. However, the simulation results have not been validated sufficiently because of the lack of observed information. In this study, through several case studies incorporating different initial and boundary conditions, authors simulated the 2011 Tohoku tsunami to discuss its verification with particular regard to tsunami inundation velocities. To better simulate tsunami inundation velocities, authors developed the tsunami run-up model with time-dependent building destruction model.