308 
South Indian Lake (Manitoba) during ice break-up. In late 
April A (25-4-74) water current patterns become apparent by 
colour of ice; 18 days later these areas have opened up 
B (13-5-74). C (17-6-74) shows a colour composite (#2); 
note the high turbidity in the South Bay area (arrow). 
Example of the colour 2 composite showing turbidity in water. 
Fig. 4 E, F: 
Aufeis (icing) development and melt. E shows aufeis in spring 
(15-5-74); F in later summer (29-7-73). 
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