<f> Angle of sides of scour hole, approximately equal to the angle of 

 repose of the grains 



<j> s Angle of repose for a given sediment grain, degrees 



Angle of the structure slope measured relative to horizontal plane 



$ Dimensionless measure of bed-load transport 



V> Einstein bed- load function 



e Diffusion coefficient 



7 Specific weight of water, either fresh or salt, as appropriate 



7 S Specific weight of sediment 



7 r Specific weight of armor unit 



7 rb Specific weight of berm stone, lb f /ft 3 



r h Bed or boundary shear stress 



r Bed or boundary shear stress 



t c Critical boundary shear stress to initiate movement 



v Kinematic viscosity = n/p 



p. Fluid dynamic viscosity 



r] Empirically obtained exponent for critical water depth calculations 



A4 



