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to? 10 7 IIS 10 B 



SECTION A- A 



VELOCITY OBSERVATIONS AT 

 10 -FT INTERVALS, SURFACE TO BOTTOM 



UPPEK POOL EL J-taFT 



BOTTOM VELOCITIES, CENTER LINE 



TEST CONDITIONS 



UPPER POOL ELEVATION I 8 FT 



LOWER POOL ELEVATION FT 



note;velocties are expressed in prototype 



FT PER SEC elevations ARE IN PROTOTYPE 

 FEET ELEVATION IS MLW NEWPORT WHICH 

 IS I 6 FT BELOW MSL. 



SCALES 



HORIZONTAL 

 VERTICAL 



150 200 



Fig. 19. Velocities in East Passage navigation opening 



of plan 35 for maximum head differential, astronomical 



spring tide with U.l-ft range at Newport 



just above the sill (lO.U ft per sec) was about 60 ft downstream from 

 the center of the sill; therefore, detailed measurements were made to 

 determine the distribution of velocities over this entire cross section. 

 The results of these latter measurements are presented in the upper por- 

 tion of fig. 19. Velocities were measured at 10-ft increments of depth 

 from the surface to the sill at 100-ft increments of width across the 

 navigation opening. These measurements indicate that velocities in the 

 cross section ranged from a minimum of about 2.6 ft per sec to a maximum 

 of about 12.9 ft per sec, the point of maximum velocity being at a depth 

 of about 20 ft below the surface. Similar data for conditions of the 

 maximum mean -tide head differential of I.3 ft are presented on fig. 20. 

 These data show that velocities in the opening ranged from a minimum of 

 about 2.3 ft per sec to a maximum of about 11.0 ft per sec, the point of 

 maximum velocity being also at a depth of about 20 ft below the surface. 



