Table 4. Frequency of occurrence of ripple heights and 

 resulting error. 



Ripple 



Occurrence 



Occurrences 



Error 



Cumulative 



height 







range 



occurrences 



(ft) 



(No.) 



(pet) 



(ft) 



(pet) 



0.07 



1 



1 







0.06 



3 



4 



±0.03 



99 



0.05 



9 



13 







0.04 



8 



12 



±0.02 



82 



0.03 



11 



16 







0.02 



20 



29 



±0.01 



54 



0.01 



17 



25 







Table 5. Actual errors due to ripples on the 

 special ripple survey. 



Error 



Measurements 



Pet of total 



Cumulative 



(ft) 



(No.) 





(pet) 



0.00 



25 



64 



64 



±0.01 



8 



20 



84 



±0.02 



5 



13 



97 



±0.03 



1 



3 



100 



40 



