I have an equation for surge pressure from 'Mechanics of Fluids' - BS Massey, which gives
Ap = p.c.U
Where Ap is surge pressure
p is fluid density
c is speed of wave propogation
U is change of velocty
In my case the fluid is NATO F34 so p is 775 - 840 kg/m3 (I have used 800)
I have calculated...