Definition 



Dimension 



Example Units 



Metric 



English 



Arbitrary significant wave height 

 for probability distributions 

 (eq. 4-12) 



Approximate minimum significant 

 wave height from a distribution 

 of significant heights (eq. 4-12) 



Average height of highest 5 per- 

 cent of all waves for a given 

 time 



Median annual significant wave 

 height (eq. 4-26) 



Significant wave height, breaker 

 value 



Significant wave height, deep- 

 water value 



Range of tide 



• Height of retaining wall 



• Height of backfill at wall if 

 lower than wall 



• structure height, toe to crest 



• Vertical distance from dune 

 base or berm crest to depth 

 of seaward limit of signifi- 

 cant longshore transport 

 (Fig. 4-44) 



• Mean channel water depth 

 (eq. 4-70) 



Broken wave height above ground 

 surface at structure toe landward 

 of SWL 



Height of broken wave above SWL 



Height of clapotis orbit center 

 above SWL 



Submerged weight of longshore 

 transport 



Angle of backfill surface from 

 horizontal (eq. 7-143) 



Subscript dunnny variable 



Pressure response factor at 

 bottom (eq. 2-31) 



• Constant for Rankin vortex 

 model of hurricane wind field 

 (eq. 3-55) 



• Dimensionless coefficient pro- 

 portional to immersed weight 

 transport rate 1» and longshore 

 energy flux factor P„ 



Diffraction coefficient 



Armor unit stability coefficient 

 (eq. 7-116) 



• Dimensionless factor for cal- 

 culation of total drag force 

 on pile at a given phase 

 (eq. 7-30) 



F/T 



N/yr 



-1 



ft 



ft 



ft 



ft 



ft 



ft 



ft 

 ft 



ft 

 ft 



ft 

 ft 



ft 

 ft 



ft 



Ib/yr 



deg 



(Continued) 



B6 



