How choose the artificial sound of speed to use an artificial bulk modulus for water?

Good evening to every body

i'm working on sph modelling of water; to obtain reasonable time step

i have to use an artificial bulk modulus in the MAT LAW 6.

I have found in the Monagham teory that it should be chosen using an artificial (lower of the real one) sound of speed that

should be at least 10 times the maximum phenomena speed.

I'm testing a water entry of a wedge, and the water surface imapact speed is 3 m/s. The water tank is in complete rest situatuion.

Is this speed that i should use as 'maximum speed of phenomena'?

Thanks