Bui. 832, U. S. Dept. of Agriculture. 



PLATE XIII. 

















- j 





I ; 



^,.-j2l! 





■ ....... ; 



■ 







W&&f 





- y 















?&08$ 





HflHsmSffr v 



■ 



z 



%$*■' 













. ' " .'• : 















'H 



' 



Ui^am 

















B. P. R.-DI203 



Fig. I —Slope Course of Willow Creek Dredged Channel, Near Missouri 

 Valley, Iowa, 1917. (See Table No. 4.) 



. P. R.— DI200 



Fig. 2.— Slope Course of Boyer River Dredged Channel, Near Missouri 

 Valley, Iowa, 1917. (See Table No. 4.) 



