for the Equation 4 model, it was found that there were no systematic errors 

 associated with the model which used the standard surf parameter. Figure 14 

 shows that the standarized percent errors for this model also seem to have a 

 normal distribution. Performing the K&S test once again showed that these 

 data were also normal at the 20-percent significance level and thus, could be 

 assumed to have a normal distribution. Figure 15 shows the more conservative 

 curve which could be expected to envelop 97.7 percent of the data and repre- 

 sents an increase of two standard deviations over the expected mean curve. 

 The coefficients for this conservative curve are a = 1.285 and b = 0.247 . 

 Once again, this curve is only one of many more conservative curves that could 

 be constructed depending upon the design situation. Using the runup coeffi- 

 cients with the standard surf parameter would be an easy way to estimate Rn, ax 

 using a small calculator. The more accurate model would require the calcula- 

 tion of L D for use in the modified surf parameter which would be more 

 difficult than calculating the deep-water wave length for the standard surf 

 parameter. 



l.U 



! 



i i i i^— * 









^i " 





0.9 





m* A* NORMAL DISTRIBUTION 



" 









OS 





W / CURVE 



" 



0.7 







" 



0.6 



- 





- 



0.5 



- 





" 



0.4 



" 



mj LEGEND 



" 



0.3 





JT/ ■ OBSERVED DATA 

 W / USING £ 





0.2 



- 





" 



0.1 



^r 



1 1 1 1 1 



" 



NORMALIZED PERCENT ERROR, 



Figure 14. Normal distribution curve for £ model data 



22 



