Entering Table C-2 with d/L = 0.10, find tanh (2TTd/L) = 0.5569. 



From Equation 2-3 which is true for both first- and second-order 

 theories. 



C^ = — tanh 

 27r 



27rd\ (32.2) (200) (0.5569) 



(t) = 



27r 



= 571 (ft/sec)' 



or 



C = 23.9 ft/sec. 



As a consequence. 



T 1 



= 0.0418 sec/ft 



L C 



Referring again to Table C-2, it is found that when 



H 

 ^=2 ' 



cosh 



27r(z + d) 



= cosh[27r(0.11)] = 1.249 



and when 



z = — — 



H 

 2 ' 



cosh 



27r(z + d) 



= cosh [27r(0.09)] = 1.164 



Thus, the value of u at a crest and trough respectively according 

 to first-order theory is 



\,1 = \ (32.2) (0.0418) ^^ = 2.8 ft/sec , 



4 1.164 



u, , = - (32.2) (0.0418) 



*'^ 2 1.2040 



= — 2.6 ft/sec 



2-44 



