Symbol 



Definition 



Dimension 



Example Unit 



Pfis 

 Po 



Pn 



Pa 

 Pm 



Pn 



Po 

 Ps 



Average porosity of rubble structure cover layer 

 (eq. 7-109) 

 •Precipitation rate (eq. 3-50) 



Wave power; average energy flux transmitted 

 across a plane perpendicular to wave advance 



Active earth force 



Longshore component of wave energy flux 

 (eq. 4-27) 



Surf zone approximation of Pg (eq. 4-28) 

 Deepwater P 

 Passive earth force 



Gage pressure; pressure at any distance below 



fluid surface relative to surface 

 •Atmospheric pressure at point located dis- 

 tance r from (hurricane) storm center 

 (eq. 3-28) 



Total or absolute subsurface pressure: Includes 

 dynamic, static and atmospheric pressures 

 (eq. 2-26) 



Atmospheric pressure (eq. 2-26) 



Maximum dynamic pressure by breaking and 

 broken waves on vertical waU (eq. 7-76) 



Pressure at outskirts or periphery of storm 

 •Normal sea level atmospheric pressure 

 = 29.92 inches Hg.(eq. 3-35) 



Central pressure of storm; CPI 



Maximum broken wave hydrostatic pressure 

 against wall (eq. 7-89) 



Nonbreaking wave pressure difference from 

 Stillwater hydrostatic pressure as clapotis crest 

 (trough) passes (eq. 7-68) 



Overtopping rate 

 •Volumetric flow rate for setup in long, 



closed basin 

 •Rate at which littoral drift is moved parallel 



to shoreline; longshore transport rate 



percent (%) 

 L/T in./hr. 



LF/T/L ft.-lbs./sec./ft. wave crest 



F/L Ibs./ft. of wall 



LF/T/L ft.-lbs./sec./ft. of beach 



LF/T/L ft.-lbs./sec./ft. of beach 



LF/T/L ft.-lbs./sec./ft. wave crest 



F/L Ibs./ft. of wall 



F/l2 lbs./ft? 



F/L^ inches of mercury; millibars 



F/L^ lbs./ft? 



F/l2 lbs./ft? 



F/L^ lbs./ft.2 



F/L^ inches of mercury 



F/L inches of mercury 



F/L^ inches of mercury 



F/L^ lbs./ft? 



F/l2 lbs./ft? 



L^/T/L ft?/sec./ft. ofwall 



L^/T mi.3/hr. 



L^/T yd?/yr. 



B-ll 



