•-4 



► -4 



a> 



•-4 



_1 I L. 



2 8rA-4 



E 6 



c 4 



o 2 



rX-4 



o. 



q: 



rX-3 



5 10 15 20 

 14 



rX-4 



5 10 15 20 

 Time in Minutes 



X-4 



Figure 6. — Dilution plots represented by resistance readings at four 5-minute 

 intervals for individual standpipes in calibration tests. 



;i 



