140 



-p 



o 



u 

 u 



3 



• © 



O -P 



(1) to 



CO 0) 



pt< J^ 



5"- 

 - 



Solar Hour after Moon's Transit 



6 l£ 



1. I . I . I . 1, 1 , I , I 



1 — n — n I — I I r-^i i i 



o 6 ts 



Lunar Hour after Moon's Transit 



Average measured midstreajn velocity, 0.3 depth 

 Sta.225, Cape Cod Canal, Sept. 28 - Oct.6> 1932. 



Figure 45. 



283. Summary. — The preceding formulas and examples show that 

 the deformation of the primary current because of the variation of 

 frictional resistance with the square of the velocity is not large unless 

 the currents are unusually strong and the channel is of moderate depth, 

 so that the flow is largely frictional. Its deformation because of the 

 varying channel depth depends on the relation between the timing of 

 the tide and the timmg of the current, as well as on the ratio of the 

 tid^xl range to the me^n depth in the channel, and usually is quite 

 small in deep channels. The deformation because of the effect of over- 

 tides may be quite large. If the ascertained variation in the surface 



