ascertain the impacts on Chesapeake 

 Bay of large influxes of freshwater 

 similar to those which occurred dur- 

 ing Tropical Storm Agnes. We intend 

 to simulate on the model three events 

 of this type. Data collection ef- 

 forts will be oriented to monitoring 

 salinity levels and ascertaining how 

 long the bay takes to return to a 

 state of dynamic normality. These 

 data will be used in assessing the 

 social, economic, and environmental 

 impact of high freshwater inflows. 



The latest test in our program 

 is the Tidal Flooding Test. Today, 

 the people of Chesapeake Bay area 

 feel rather secure, as the last large 

 flood was in 1933. Since that time, 

 there has been much development in 

 the flood plain, and if another 

 storm occurred, there could be wide- 

 spread damage. But, the flood plain 

 of Chesapeake Bay and its tributaries 

 is not that well defined. Our ob- 

 jective is to use the hydraulic model 

 in conjunction with a numerical model 

 to provide a better definition of 

 flood frequency. In this case, our 

 primary tool will be the numerical 

 model. Data from the hydraulic 

 model will be used to assist in 

 calibrating and verifying the numeri- 

 cal model. I might add that con- 

 junctive use of models is becoming 

 increasingly important in addressing 



hydrodynamic phenomena. There is 

 no question that better answers can 

 be obtained if the numerical model 

 and the hydraulic model are used so 

 that their strengths are accentuated 

 and their weaknesses minimized. 



REFERENCES 



U.S. Army Engineer District, Balti- 

 more. Chesapeake Bay Plan of 

 Study, June 1970. 



U.S. Army Engineer District, Balti- 

 more. Chesapeake Bay existing 

 condition report; 1973. Avail- 

 able from NTIS, Springfield, VA; 

 AD-A005500 thru AD-A005506. 



U.S. Army Engineer District, Balti- 

 more. Chesapeake Bay future con- 

 dition report; 1977. Available 

 from NTIS, Springfield, VA; AD- 

 A052482. 



U.S. Army Engineer District, Balti- 

 more. Chesapeake Bay study re- 

 vised plan of study; October 

 1978. 



Western Eco-Systems Technology. Ches- 

 apeake Bay low flow study; Biota 

 Assessment; 1980. 



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