W^/^/^^^/^^^/^//^^^^/^//^/^//^/y>^A 



P - 100 7o Flotation 



I1-Fd=I8 



(D + L) 



'(D + L) J L 



L.ive l.ocu 

 EZti±±ZZZZZZZZZZZZZZZZZZZ2ZZZZZZZZ 



ZZZZZZ2 



P - 507o Flotation 



]Lf,= I8" 



Assumptions! Thickness of Deck and Flotation Adjusted to Make 



Deadload Freeboard ( Fq ) = 18" 

 Salt Water Density = 64 Lbs/Ft^ - 5.33 Lbs/In. Ft^ 

 Fresti Water Density = 62.2 Lbs/Ft^ = 5.18 Lbs/In . Ft^ 



Therefore : S 



Load in Lbs/Ff^ x 100 



P X Density of Water 

 F ^ So + I8"-S 



Where S and F AppI] 

 for Dead or Live 

 Load Conditions 



^j \ I I 1 I I I r 

 Sea Water ( Typ.) _ 



^^..^.s— Fresh Water (Typ.)_ 



10 20 30 40 50 60 70 80 90 



P= Percent of Deck Area Supported by Floots 



Figure 78. Reduction of freeboard due to concentration of flotation elements for 

 F£) = 18 inches. 



130 



