510) 
| 5.0 
-0.9-ft Contour 
20.0 
15.0Frs 
20.0 
-|.4-ff Contour 
Distance from Original SWL Intercept (ft) 
29.0 
15.0 Range | 
20.0 
-|.9-ff Contour 
@) 50) 2 100 150 
Cumulative Time (hr) 
Figure 21. Comparison of the -0.9-, -1.4-, and 
-1.9-foot contour movements. 
42 
