48 



to the increase in surface area upstream from the Lower Bay barriers. 

 71. Current velocities in the East and West Passage navigation 

 openings of plan 36 for conditions of spring and mean tides were equal 

 to or slightly greater than those of plan 35- Maximum flood and ebb 

 currents on all verticals and at all depths were generally 0.1 to 0.3 

 ft per sec greater than for plan 35 because of the increase in tidal 

 prism upstream from the barriers. The slightly greater reduction in as- 

 tronomical tide ranges for plan 36 caused a minor increase in maximum as- 

 tronomical tide head differentials across the East and West Passage bar- 

 riers, which resulted in the minor increases in current velocities in 

 the navigation openings for this plan over those of plan 35- Detailed 

 current velocity data for plan 36 are not presented herein because of 

 their similarity to plan 35 data. 



