R - Reynolds number for mean nominal sphere 



S - Slope of energy gradient 



5 - Sorting coefficient of sand sample 



t, - Depth of flow 

 d 



V - Particle velocity 



V - Mean backwash edge velocity 

 e 



V - Settling velocity of nominal sphere 

 n 



V - Terminal settling velocity in quiescent fluid 

 P 



w - Terminal fall velocity of particle. (Equivalent to V ) 



6 - Beach slope 



ILL - Dynamic viscosity 



V - Kinematic viscosity 



Of - Fluid density 



O -Particle (solid) density 



06 - Geometric expression of shape 



