100 

 80 



^ 1 I \ I I I 



5 10 15 20 25 30 35 40 45 50 55 50 



6 (degrees) 



Figure 6a. — Length.- to- depth, ratios for oases of no seepage^ active cnxrves 



{i.e. 3 z > "dry" critical depth). 



14 



