40 J, L. Greenleaf—The Hydrology of the Mississipj)i, 



Fig. 4.— Hydrology of the Tributaries of the Mississippi River, High, 

 Average, and Low Discharges, and Rainfall, 



SSISSIPPI ABOVE MOUTH OFTHE MINNESOTA 

 'X'' li)l.77 £u.3b,»a cr2,07 



Wl-3' General Explanation of 

 Diagram. 



All rectangles are meas- 

 ured from the common 

 line BB. 

 Lengths of rectangles re- 

 present the flow in cubic 

 feet per square mile per 

 second. 

 Widths of rectangles are proportional tb the 



areas of the watersheds (in square miles). 

 H denotes high water, A denotes average flow, 



L denotes low water. 

 The average rainfalls for each of the four 

 seasons and for the year, reduced to cubic 

 feet per square mile of watershed per second, 

 are shown by the broken lines. 





Notes on the Times of High and Low Water. 



Mississippi al)Ove the Minnesota. Mgh.— Rise begins in early April, due to 

 Spring rains and melting snow — reaches a max. in end of April to May, and 

 often is the max. of the year. Effect of melting ceases, but rains maintain a 

 fair stage. Decided rise in June to July, due to rains — sometimes the highest 

 of the year. Generally a brief Fall freshet. 



