Sec. 66.2 



STEPS IN PRELIMINARY DESIGN 

 TABLE 66.a — Resteictbd-Channel and Open-Sea Data 



461 



parameters or which can be introduced directly 

 into formulas, tables, and graphs. 



First there is required a computation of the 

 distances to be traveled at each of several speeds, 

 and the times involved in steaming at those 

 speeds. Here and elsewhere in the book, the 

 distances are in nautical miles. From Port Amalo 

 to Port Bacine, dock to dock, is 1,148 mi by the 

 best route, of which 25 mi is in the Port Amalo 

 ship canal and an insignificant portion, 1 mi or so, 

 in Port Bacine Harbor. Of the 25 mi in the canal, 

 the 16 mi at the Port Amalo end is in a restricted 

 channel. From Port Bacine to Port Correo, dock 

 to dock, is 1,589 mi by the approved track, of 

 which 204 mi is in the large, fresh-water river. The 



distances, water depths, channel widths, and 

 hydraulic channel radii Rh are given in Table 66. a. 

 The values oi R„ , derived by the method of 

 Sec. 61.14, are somewhat variable because of the 

 irregular configuration of the beds and banks of 

 the several restricted waterways. 



Adverse and favorable currents are investigated 

 from the appropriate Sailing Directions. Their 

 directions and velocities are listed for reference 

 in Table 66.b. 



The Sailing Directions specify a maximum 

 speed of 8 kt for any large vessel in the restricted- 

 channel portion of the Port Amalo ship canal, 

 and advise a speed of not to exceed 10 kt in the 

 remaining wide portion of the canal. No limiting 



TABLE 66.b — Tidal and Water Data fob Route of the ABC Ship 



