A LIMNOLOGICAL RECONNAISSANCE 



TABLE 4— COMPARISON OF OKOBOJI AND GENEVA LAKES. 



See Fig. 1. 



nr ^'f* '(> 20 -JO -^O ■SO 60 70 30 90 ^f^ 



■«<3S 



■^S 



2S 



JS 



•^S 



Fig. 1. Percentile hypsographic curves of lake Okoboji (O) and Geneva lake (G). 

 These curves show the area of the lake basin at any depth, as a percentage of the 

 area of the surface. See Table 4. 



The difference between the lakes is striking. The area 

 of the basin of Okoboji lake is reduced to one-half that of 

 the surface just below 10 meters; in Geneva lake the same 

 reduction is found below 20 meters, and this in spite of the 

 fact that the areas of the two lakes at 5 meters are an al- 



