Dunkirk: Where History Happened. We visit 10 places connected with the remarkable evacuation of the British Expeditionary Force from northern France in 1940. This feature was first published in the April 2010 edition of BBC History Magazine. Tuesday 25th May 2010.
The seepage velocity is less than the actual flow rate of the liquid or gas in the pores because the fluid moves only through the portion of the cross-sectional area S that is occupied by the pores.
Velocity Calculation. Velocity refers to the speed in a given direction. Velocity refers to a vector measurement of the rate and direction of motion. The scalar or the absolute value magnitude of the velocity vector is the speed of the motion. Velocity is denoted by the symbol 'v'. Velocity is a vector physical quantity; both magnitude and direction are required to define it.