THE FLOW OF WATER I:N' IEEIGATION CHANNELS. 65 



No. 107, R. S., Ten-Mile feeder, Idaho. Semicircumference 144 inches long. 

 Flume clean. Coefficient n=0.013. 



Xo. 108, R. S., South Ridge Canal, section 1, Idaho. Semicircumference 60 inches 

 long. Flume clean. Coefficient n=0.0139. 



Xo. 109, \'MC+, King lateral extension, Uncompahgre project. United States 

 Reclamation Service, Colorado. Excellently constructed as to alignment and grade. 

 Xo. 108 flume. Coefficient n=0.0179. 



Xo. 110, "V'1IC+. Same system as Xo. 109 above. Same class of construction. 

 Xo. 120 flume. Coefficient ?i=0.0177. 



Xo. Ill, "S^MC^-. Same system as Nos. 109 and 110 above. Same class of con- 

 struction. Xo. 96 flume. Coefficient n=0.0166. 



METAL FLUMES OF CORRUGATED IRON. 



Xo. 112, "V1IC+, Stewart Canal near Paonia, Colo. A Xo. 132 flume with numerous 

 curves. Test in table covers whole flume. Value of n for portions of flume range 

 from 0.0196 on a reach, most of which was on a curve of 300 feet radius to 0.0224 on 

 a tangent. A similar test on a reach of X"o. 144 flume 278 feet long, with two curves, 

 gave a value of 0.0230 for n. Coefficient n=0.0222. 



MASONRY-LINED SECTIONS. 



Xo. 114, R. S., Cottonwood flume, Idaho. Rubblestone fairly well laid. Some 

 coarse sand in bed being carried as silt. Coefficient 7i=0.0163. 



EARTH CHANNELS. 



Xo. 118, W-14++, Interstate Canal, Xebraska. In same soil and with same gen- 

 eral description as Xo. 120. This canal designed with frictional factor of 0.025, but 

 on account of high velocity maximum discharge allowed is 830 second-feet instead 

 of the 1,421 second-feet for which designed. Coefficient n=0.012. 



Xo. 121, SF-21**, Bear River Canal, Utah. Canal six years old. Section changed 

 from trapezoidal with 1 to 1 slopes to present form. Bottom covered with sediment, 

 but free from gravel and growth. Coefficient n=0.0134. 



Xo. 122, SF-12**, Bear River City Canal, Utah. Age and condition similar to 

 No. 121 above of which this canal is a branch. Coefficient n=0.0135. 



Xo. 123, SF-15**, Corinne branch, Bear River Canal, Utah. Reach free from 

 growth. Originally trapezoidal in clayey loam now segment of ellipse lined with 

 smooth-eilt. Six years old. Coefficient n=0.0155. 



Xo. 124, SF-22**. Same canal as Xo. 123 above. Same conditions but carrying 

 a firnall part of rated capacity. Coefficient n=0.0164. 



Xo. 125, VMC+, Fort Lyons Canal, Colorado. Carrying but 7 per cent of capacity, 

 merely covering bottom. Slight curves at ends of reach. Bottom fine silt, merging 

 into sand. In placc-s boggy. Exceptionally smooth, regular, and free from im- 

 pedimenta. Cr)eflricient n=0.0165. 



No. 128, W-lb-f-|-, Empire Intake Canal, Colorado. Straight, grade uniform, 

 channel in firm wand, and gravel having no peljbles larger than one-half inch diameter. 

 No vegetation. Two years old. Coefficient n=0. 0170. 



No. 129, VV'-l-|-4-. Same reach a« No. 128 above with different discharge. Coeffi- 

 cient n=O.Oi94. 



No. 131, VM(.'-f-, Jarbeau Power Canal near Rifle, Colo. New. First third of 

 reach in clayey loam with few water-worn stones projecting. Rest of reach in clayey 

 loam in which mttm was starting. Cf>efFicient n=0.017G. 



No. 13fi, SP'-S**, Locran, Hyde Park and Smithfiold Canal near Logan, Utah. In 

 0)>eration 15 yearn. Bottom and Hides smooth earth and gravel up to ] inch in diamo- 

 TMSfi'-Bull. 194—1.' 5 



