212 



plotted in figure 70. The computed tides are seen to be in satisfactory 

 concordance with the observed tides. 



12 18 



Standard Time 



Adjusted tides 



Recorded tides o o o 

 Figure 70. — Adjusted and observed tides, Chesapeake and Delaware Canal, November 27-28, 1928. 



410. Adjusted velocities and discharges at base velocity station. — The 

 primary currents are the largest in the subsection between stations 61 

 and 77. The corrected velocities at station 69, the velocity station of 

 this subsection, are determined from the adjusted tides at stations 61 

 and 77, by the procedure described in paragraphs 260 to 276 of chapter 

 V. The value of the hydraulic radius, r, as derived from the given 

 cross section of this part of the canal, varies from 12.3 at tide to 16.9 

 when the tidal height is 6.0 feet. The corresponding values of C, from 

 the Bazin formula, with the coefficient used in the determination of 

 the primary tides and currents, are 94.3 and 100, respectively. The 



