1 26, U. S. Dept. of Agriculture. 



Plate IX. 



Fig. 1 .—Typical Crack in Concrete Lining, Truckee-Carson Canal, Nev. 



. - "."'. '■■' v~V"--' 





\ 





m'#\ '- . - - 



(*' - X ~ f ' '■"-■*■ ■ 





4 



h^: r --:.;- - "^ 



SHSjSJt *jl 



-^$BBI 



^■C/aifc 



■ / - • ^SC " ~ ■- 



;s| 







gi* : 















\ 



f 















Fig. 2.— Crack in Concrete Lining Extending Through Diabase Rock, Truckee- 

 Carson Canal, Nev. 



