's 



SYMBOLS AND DEFINITIONS 

 water depth at the toe of the slope or structure on which runup occurs 

 acceleration of gravity, 32.2 feet per second squared 

 significant wave height at the toe of the structure 



k runup correction factor for scale effects 



L deepwater wavelength, L = gTp 2 /27r 



R mean runup 



R s significant runup, i.e., average runup of the highest one-third of 

 wave runups 



R2 2-percent runup, i.e., elevation above the Stillwater level exceeded by 

 2 percent of the runups 



Rdgs 98-percent rundown, i.e., depth below the Stillwater level that is just 

 greater than 98 percent of the rundowns 



r rough-slope runup correction factor, ratio of rough-slope runup to 

 smooth-slope runup, all other conditions the same 



Tp period of peak energy density of the wave spectrum 



T s significant wave period, i.e., average period of the highest one- third 

 of waves 



G angle formed between the slope of the structure and the horizontal 



£ surf parameter, % = [(Hg/Lo) 1 / 2 cot 0] -1 



