CONCRETE LINING FOR IRRIGATION CANALS. 



measurements — Continued . 



21 



Loss per mile. 



Maxi- 

 mum 



Mini- 

 mum. 



Mean. 



Loss per 

 square 

 foot of 

 wetted 

 area in 



24 hours. 



Character of material 

 in the channel. 



Source of informa- 

 tion. 



Remarks. 



Per 

 cent. 



Per 



cent. 



Per 

 cent. 

 1.20 



.30 



Cu. feet. 

 0.73 



4.10 



7.30 



2.70 



1.78 



U.35 



1.49 



11.66 

 1.27 

 2.09 

 1.85 



1.18 

 1.29 

 1. 



2.85 

 .42 



.61 

 2.77 



Medium clay loam, 

 underlain with 

 limestone shale at 

 l\ feet. 



Rock and clay loam. 



.45 



Clay loam underlain 

 by hardpan; rock 

 exposed in places. 



Lava rock covered 

 with clay loam 1 to 

 3 feet deep. 



Impervious clay 

 loam. 



.do. 



Varies between im- 

 pervious clay loam 

 and sandy loam, 

 all underlain with 

 hardpan. 



Clay loam mixed 

 with gravel. 



.X2 



1.57 

 1.82 

 1.38 



11.12 

 1.20 

 1.79 

 1.26 



1.07 

 1.16 

 1.87 



3.12 



.44 



.67 



.58 



.43 

 1.85 



Clay loam . 



Clay, silt, and gran- 

 • ite wash. 



.do. 



\Granite, sand wash, 

 I and lake deposit. 

 Granite, sand wash, 



lake deposit, and 



volcanic ash. 

 \Sand and gravel, 

 / partly cemented. 

 Cemented gravel and 



sand. 



do 



do 



[Sand an'd gravel 

 < more or less ce- 

 [ mented. 

 (Volcanic ash, clay 

 ■! and cemented 

 { gravel. 



Report D. H. Bark, 

 9th Biennial Re- 

 port State Eng. 

 Idaho, 1911-12. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 



Report F. W. Han- 

 na, in report of 

 Boise Conference 

 of Operating En- 

 gineers, U.S.R.S., 

 Boise, Idaho, 

 Nov., 1911. 



....do 



....do 



....do 



..do. 

 ..do. 



.do. 

 .do. 



....do. 

 ....do. 



Measured June 15, 1912. 

 Uniform grade and clean 

 cross section; canal carry- 

 ing only part of capacity; 

 water flowing on limestone 

 shale; used 2 years. 



Measured June 16, 1912. 

 Coulee or natural water 

 course; well silted greater 

 part of section. 



Measured June 16, 1912, 

 below check basin. Clean, 

 uniform cross section and 

 grade; used 2 years. 



Measured June 14, 1912. 

 Small lake about 62 acres; 

 rather regular in outline; 

 1,200 feet of rock cut at 

 outlet; used 2 years. 



Measured May 27, 1912. 

 About 10 wooden drops in 

 this ditch; regular cross 

 section; irregular grade; 

 used 2 years. 



Measured May 27, 1912. 

 Ditch carrying only one- 

 fifth capacity; uniform 

 cross section; no weeds in 

 channel; used 2 years. 



Measured May 26, 1912. 

 Irregular cross section; car- 

 rying only small part of 

 capacity; numerous drops; 

 varying grades; used 2 

 years. 



Measured May 23, 1912. 

 Clean, uniform cross sec- 

 tion; mostly side-hill sec- 

 tion; well silted; used 3 

 years. 



Measured May 23, 1912. 

 Clean, uniform cross sec- 

 tion; well silted bottom 

 and banks; used 3 years. 



Bottom. 



Do. 

 Side hill. 

 Bench and bottom All. 



Side hill. 

 Do. 



Bench. 



Side hill and bench. 



Side hill. 

 Bench. 



