The hydraulic model now includes all the delta waterways south of 

 Sacramento, west of Stockton, and north of Tracy; all of Suisun, San Pablo, 

 and San Francisco Bays; and more than 200 square miles of the adjoining 

 Pzlcific Ocean. 



During the year, using the expanded model, the Corps in collaboration 

 with other agencies initiated studies of San Francisco Bay and the Sacra- 

 mento-San Joaquin delta area for water quality and waste disposal. The 

 search for solutions to these specific problems will consider the total impact 

 of all competing needs, such as flood control, navigation, salinity control, 

 water supply, tidelands reclamation, and recreation. 



The Corps of Engineers also initiated an in-depth study to prepare a plan 

 to guide the development of the entire bay region. By balancing present 

 and potential users against the environmental resources of the area, a range 

 of alternatives will be established from which Federal, State, and local 

 interests can choose those most prudent and fruitful for the benefit of the 

 greatest number. 



Chesapeake Bay 



The Chesapeake Bay oflFers a range of problems and possible solutions 

 that may furnish guidance for work in similar estuarine and coastal environ- 

 ments. The Corps of Engineers, with the assistance of the Chesapeake Bay 

 Study Advisory Group, representing State and Federal agencies as well as a 

 wide variety of disciplines, has refined and extended its earlier investigations. 

 A detailed plan has been prepared for a comprehensive study, construction 

 of a hydraulic model of the bay, and an associated research center. 



Multidisciplinary research activities in the technical center would con- 

 centrate on hydraulic and ecological studies. The physical model of the 

 bay, supplemented by mathematical models and conventional analysis, would 

 help to provide a fuller understanding of the physical and biological traits 

 of the bay, and the insight necessary to properly manage the system in 

 consonance with man's rapidly increasing involvement in the Chesapeake 

 environment. 



Conservation and Recreation 



The National Park Service now includes 22 areas contiguous to the coast- 

 line — 13 national parks and monuments and nine national seashores and 

 lakeshores. 



In addition, the Service administers 28 historic areas located along the 

 coasts. Most recently authorized for incorporation into the system are: 

 Biscayne National Monument in Florida and Redwoods National Park 

 which includes a 30-mile stretch of the California coast. Feasibility studies 

 were made in other proposed marine areas. Acquisition of National Park 

 Service lands is continuing, including areas located in the coastal zone 

 such as Assateague Island National Seashore, Biscayne National Monument, 

 Indiana Dunes National Lakeshore, and Pictured Rocks National 

 Lakeshore. 



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