CONCRETE LINING FOR IRRIGATION CANALS. 45 



elements, value of'C" in Chezy' s formula and "n" in Kutter' s formula — Continued. 



ft 





 "3 

 > 



& 



•2 

 >> . 



■* 2 



a 







■g C3 



.9-2 



8 



03 a 



« g> 



o.eg 

 



r] 60 



53 O 



SB 



rt) 60 



Condition of surface, 

 etc. 



Remarks. 



Reference and 

 authority. 



1.67 



3.59 



2.83 

 2.89 



87.1 



89.7 



76.2 

 76.5 



.0176 



.0174 



.0188 

 .0197 



Vertical 

 curves. 



...do 



...do 



...do.. .. 



Level and 

 hook gage. 



...do 



...do 



...do 



Medium smooth 

 concrete; 0.1 to 0.2 

 foot of sand in 

 bottom; rough 

 with hard deposit 

 about J inch thick. 



Fairly smooth con- 

 crete with no 

 vegetable growth. 

 Tangent. 



Rough finish with 

 combined vege- 

 table and mineral 

 deposit. 



Fairly smooth ce- 

 ment finish rough- 

 ened by a dark 

 deposit. 





F. C. Scobey, Irri- 

 gation Investiga- 

 tions. 



Do. 

 Do. 



A few loose rocks 

 in canal and 

 right angle turn 

 below section 

 accounts for high 

 "n." 



Tangent 



Shifting sand on 

 bottom. 



Do. 



