Table 5-~"Va1ues of burned area/initial area and final perimeter 

 1 ength/ i n 1 1 i a 1 perimeter length when the suppression tactic is to 

 build barriers ahead of the fire as sketched in figure h. In this 

 table, the barrier location, a, is chosen to be twice the value 

 which minimizes the burned area using this tactic (see table k) . 

 This "margin of safety" is introduced to accommodate the practical 

 difficulty of estimating forward rate of spread and/or suppression 

 rate to high accuracy 







n = 1 



n = 2 





n = 4 



A 



a 



Burned 



F i na 1 



a 



Burned 



Final 



a 



Burned 



F i na 1 







ro(o) 



area 



per i meter 





a rea 



pe r i me te r 



ro(o) 



a rea 



per i meter 



9 n 



n 1 



0.08 



1 .73 



1 .36 



0.04 



1 .54 



1 .25 



r\ nil 



1 .42 



1.17 





.2 



.08 



1 .88 



\.k2 



.07 



1 .69 



1 .30 



.04 



1 .56 



1 .23 





■} 

 • J 



.09 



2.08 



1 . A8 



.08 



1 .86 



1 .36 



n c 



1 .73 



1 .29 



1 r 



1 



. 1 



.19 



2.2h 



1 .56 



.\k 



1 .88 



1 . 38 



. u / 



1 .62 



1 .25 





.2 



.21 



2.52 



1.65 



.15 



2.10 



1 .46 



.08 



1 .84 



1 .34 





• J 



.23 



2.9^* 



1 .77 



. 16 



2.43 



1 .56 



. Uo 



2.11 



1 .43 



1 9C 



1 



. 1 



.27 



2.11 



1 .76 



.17 



2.15 



1 .49 



1 1 

 . 1 1 



1 .83 



1 . 33 





.2 



.31 



3.26 



1 .90 



.19 



2. 50 



1 .60 



.15 



2.16 



1 .44 





•J 



.35 



^.00 



2.08 



.26 



3.12 



1.78 





2.59 



1.58 



1.0 







. 1 



.68 



it. 89 



2.36 



.40 



3.15 



1.81 



.22 



2.30 



i.49 





.2 



.76 



6.20 



2.64 



.47 



3.97 



2.02 



.26 



2.85 



1 .66 





.3 



.90 



8.66 



3.08 



.52 



5.00 



2.26 



.30 



1 



3.67 



1.89 



0.8 



. 1 



2.m 



19-0 



4.72 



.94 



6.34 



2.59 



.46 



3.37 



1 .82 





.2 



2.7k 



36.^ 



6.49 



1 .08 



8.53 



2.99 



.52 



4.58 



2.12 





.3 



3.56 1 



56.6 



7.94 



1 .30 



13.70 



3.77 



.60 



6.49 



2.52 



-'- For all cases, V /V. = 0.5. 



18 



