Sand Flux (g/cm2/min) 



55 60 65 70 



Mid-Flow Speed (cm/s) 



75 



Figure 37. Area beneath each nozzle rate prediction used to 

 calculate sand-trapping efficiency 



104. The areas below the upper and lower 95 percent confidence limits 

 were calculated, and the sand- trapping efficiency E s and corresponding 

 maximum error e were computed as follows: 



E s ± € - Atr -I 1 ± 



(AuTR " A 1Tr) + (^uCU " A lCu) 



2 Acu 



2 A T 



(22) 



where 



Axr = area below SUPERDUCK or DUCK85 equation 



A cu = area below Cube equation 



AyTjj = area below upper confidence limit equation (either SUPER- 

 DUCK or DUCK85 equation) 



A 1TR = area below lower confidence limit equation (either 

 SUPERDUCK or DUCK85 equation) 



76 



