establishing a broad program of monitoring performance, it is probable that 

 the reliability of future systems will be increased while the cost of construct- 

 ing and placing the same system will decrease. 



seat loor installation 



Amplification Module 



flexible membrane 



Figure 5. NCEL Foundation Performance Monitoring System (FPMS). 



CASE STUDIES 



Information has been gathered on the characteristics and performance 

 of approximately 200 foundations which have been used on the seafloor. These 

 case histories have been divided into four categories. The first three categories, 

 Acoustic Arrays, Miscellaneous Structures, and Habitats, include all of the 

 totally submerged structures. The fourth category, Offshore Platforms and 

 Towers, includes the structures which extend to and above the ocean surface. 

 The fourth category also summarizes information on over 300 offshore struc- 

 tures for which specific performance information was unavailable. 



