Table 1. Level of Inspection and Damage Detected 

 for Underwater Concrete Structures 



Purpose 



Level I General visual to confirm 

 as-built condition and 

 detect severe damage 



Defects 



Severe mecbanical or ice 

 damage 



Level II Detect surface defects 

 normally obscured by 

 marine growth 



Surface cracking due to 

 mechanical overload 



Severe corrosion of rebar 



Spalling of concrete 

 surface 



Level III 



Detect hidden and 

 incipient damage 



Location of rebar 



Depth of concrete cover 

 over rebar 



Incipient corrosion of 

 rebar 



Internal voids 



Change in material 

 strength 



23 



