The Columbia River estuary model (48,000 square feet) was construc- 

 ted in 1961-62. Design and construction required about 11 months at a 

 cost o£ approximately $230,000. Hydraulic and salinity verification 

 required about 15 months at a cost of approximately $125,000. Shoaling 

 verifications were performed at various channel reaches during individual 

 studies. Testing for about 20 separate studies was carried out over about 

 6 years. Total cost of the model was approximately $1.2 million. 



The Mobile Bay model (30,000 square feet) was constructed in 1972. 

 Design and construction required about 4 months at a cost of approxi- 

 mately $153,000; hydraulic and salinity verification required about 12 

 months at a cost of $77,000. Testing to develop the best plan for 

 dredged-material disposal areas for the proposed Theodore Ship Channel 

 required 11 months and $113,000; preparation and publication of the 

 final report cost $10,000. The total cost was approximately $353,000. 



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