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 ISLAND 







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 SRCE MT OF 

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Figure 3-79. Proposed Alpha plan structure, Galveston Bay 

 (Bobb and Boland, 1970a) . 



maximum allowable for safe navigation) , with no significant effects on 

 salinity conditions and on dispersion patterns or rates. 



The Gamma barrier (Fig. 3-80) as originally designed would cause 

 tidal ranges downstream of the barrier to increase, the mean tide level 

 to lower, tidal ranges upstream of the barrier to reduce, the tidal prism 

 upstream to reduce, salinities upstream of the barrier to reduce, and con- 

 centration of the effluent from the ship channel upstream of Morgan Point 

 to increase (all changes were slight). However, dispersion patterns were 

 relatively unaffected and maximum current velocities were below the maxi- 

 mum allowable. The test results showed that the total cross-sectional 

 area of the tidal passages was not sufficient. Both design barrier plans 

 were subjected to further testing to determine the configuration and 

 total cross-sectional area of the tidal passages required to achieve the 

 minimum effects on conditions within the system. 



j . Upstream Flow Regulation — Delaware River . 



(1) Project . Regulation of Delaware River freshwater discharge 

 by construction and operation of the proposed Tocks Island Dam. 



(2) References . U.S. Army Engineer Waterways Experiment Station 

 (1956); Simmons, Harrison, and Huval (1971). 



(3) Laboratory . WES. 



(4) Test Period . July and September 1966. 



(5) Problem . Since operation of the proposed Tocks Island Dam 

 would modify the annual freshwater discharge characteristics of the Dela- 

 ware River, it was necessary to determine the environmental impact of 

 such action. 



73 



