CONCRETE LINING FOR IRRIGATION CANALS. 

 measurements — Continued . 



17 



Loss per mile. 



Maxi- 

 mum. 



Per 

 cent. 



Mini- 

 mum. 



Per 

 cent. 



Loss per 

 square 

 foot of 

 wetted 

 area in 



24 hours. 



Per 

 cent. 

 29.80 



.90 



13.80 



3.80 



.00 



29.30 



35.40 



12.70 



18.20 



Cu. feet. 

 1.8< 



Character of material 

 in the channel. 



Medium clay loam. 



.do. 



Deep medium clay 

 loam. 



Rather porous clay- 

 loam, hardpan at 3 

 feet. 



Deep uniform clay 

 loam, hardpan at 2 

 to 2 J feet. 



Medium clay loam, 

 hardpan at 2 feet. 



Deep uniform sandy 

 loam. 



Sandy loam . 



Gravelly, sandy loam 



Very gravelly and 

 porous. 



Very gravelly. 



Medium gravelly . 



Source of informa- 

 tion. 



Report D.H. Bark, 

 9th Biennial Re- 

 port State Eng. 

 Idaho, 1911-12. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



Measured Sept. 13, 1912, 4 

 miles southeast of Twin 

 Falls. Regular cross sec- 

 tion; somewhat eroded; no 

 weeds; used 5 years. 



Measured Sept. 12, 1912, 7J 

 miles southwest of Twin 

 Falls. Clean clover sod on 

 banks; uniform cross sec- 

 tion; used 3 years. 



Measured Sept. 9, 1912, 2 

 miles west of Filer. Clean 

 uniform cross section; used 

 4 years. 



Measured Sept. 12, 1912, 7 

 miles southwest of Twin 

 Falls. Uneven cross sec- 

 tion; much moss; water 

 near top of bank; used 4 

 years. 



Measured Sept. 14, 1912, 6£ 

 miles southwest of Twin 

 Falls. Uniform cross sec- 

 tion; 1,000 feet new dike; 

 used 5 years. 



Measured Sept. 11, 1912, 6 

 miles southwest of Twin 

 Falls. Upper part fairly 

 uniform cross section; lower 

 part somewhat irregular, 

 with weeds; used 5 years. 



Measured June 6, 1912, 2 

 miles east of Wendell. 

 Carrying only half capacity ; 

 clean uniform cross sec- 

 tion; used 4 years. 



Measured June 6, 1912, 1 

 mile south of Wendell. 

 Clean uniform cross sec- 

 tion; no erosion; carrying 

 only one-fourth capacity; 

 used 3 years. 



Measured Aug. 26, 1912, 5 

 miles southwest of Rigby. 

 Partly in dike; fairly uni- 

 form cross section; alfalfa, 

 moss and sweet clover 

 growing in channel; used 5 

 years. 



Measured Aug. 25, 1912, 4 

 miles southwest of Rigby. 

 Uniform cross section; 

 heavy growth of weeds and 

 moss in channel; low ve- 

 locity; used 6 years. 



Measured Aug. 25, 1912, 4§ 

 miles southwest of Rigby. 

 Irregular cross section; 

 some weeds and sweet clo- 

 ver growing in channel; 

 used 6 years. 



Measured Aug. 24, 1912, 7 

 miles southwest of Rigby. 

 Uniform cross section 

 some gopher holes in bank 

 used 7 years. 



48307°— Bull. 126—14 2 



