PLATE 13 



MACIHNAW 



HARBOR JBEA 



MILWAUKEE 



MACIfWAW 



Observed 



HARBOR 



Corrected for 

 barometric and 

 wind effects 



Rainfall* inflow 

 -outflow 



MILWAUKEE 



LAKEMICBTG. W-JIUROtfMI. 'AW 



Elevations of water surface, Lake Michigan-Huron, August 28-September 30, 1911. 



