A ce = 1,000 

 C de = I.O 



ft 2 I— I 



B= 125 ft 



H ' = 7.8 ft 

 T = 7s 

 Monochromatic Wave 



H = 8 ft 

 d s = 12 ft 

 h = 13 ft 



tan = 0.667 



^~ Shoreline 



Figure 6. Design conditions for example problem 1. 



The first step in computations is to determine values for the dimensionless 

 parameters: 



7.8 



gT 7 32.2(7) 2 



= 0.0049 



and 



d s 12 



— = —==- = 1 53 



HA 7.8 - L ' 3J 



From Figure 2, a and Q* are estimated as a = 0.053 and Q* = 0.019. The 

 surf parameter and resulting runup are determined using equation (2) : 



5 = , °^ 67 = 3.74 



'£ 



and 



R = 



12(72) 

 0.692(8) (3.74) 



=7.17 feet 



(1 + 0.504 [3.74]) 

 The breakwater freeboard is F = h - d s = 13 - 12 =■ 1.0 foot. 

 The overtopping rate, q , given by equation (1) is 



0.1085 

 ( 1.11 - l. \ 

 V7.17 + 1.) 



.053 



q o /32.2(0.019)(7.8) 3 



=9.53 cubic feet per second per foot of breakwater crest. 



16 



