THE FLOW OF WATER IN IREIGATIOK CHANNELS. 63 



Xo. 16, R. S., Lizard chute, Boise project. United States Reclamation Service. 

 Straight, very smooth and uniform. Sides battered 1 in 12. Meter measurement 

 in canal below chute. The chute is 900 feet long, in three slopes. Coefficient 

 71=0.0124. 



Xo. 17, R. S. Same section as No. 16 above with different discharge. Coefficient 

 « =0.0130. 



Xo. 18, VMC4-, Long Pond chute near Fort Collins, Colo. A reinforced concrete 

 chute carrying water on steep grade at velocities from 12 to 20 feet per second. Con- 

 structed in 1910. Meter measurements made in 1912 near inlet in lower velocities. 

 Elements determined by measurements down from bench marks to top and bottom of 

 pulsations. Mean of these two measurements accepted. These tests two of five, 

 made with discharges ranging from 35.79 to 122.94 second-feet. The values of n range 

 inconsistently from 0.0125 down to 0.0111 for discharge of about 104 second-feet and 

 then back to 0.0123 for the greatest discharge. 



Xo. 19, VMC-|-. Same channel and reach as No. 18 above. Coefficient w=0.0125. 



Xo. 20, R. S., 5***, Umatilla project, United States Reclamation Service. Smooth, 

 regular, section on a slight curve. Coefficient w=0.013. 



X'^o. 21, R. S., 1***, Umatilla project. United States Reclamation Service. Circular, 

 4.9 feet radius. As left by wood forms. On tangent. Coefficient n=:0.0132. 



Xo. 22, R. S., 4***. Same conduit but on curve of 100 feet radius. Coefficient 

 71=0.0142. 



No. 23, R. S., 3***. Same conduit but on a curve of 50 feet radius. Coefficient 

 n=0.0189.i 



No. 24, R. S., Arena chute, Boise project. United States Reclamation Service. 

 Straight, very smooth and uniform. Sides battered 1 in 6. Meter measurement in 

 canal below chute. Coefficient 71=0.0139. 



No. 32, "\\MC-f, South Canal, Uncompahgre project. United States Reclamation 

 Service, Colorado. This and the following two tests made on short sections between 

 cur%-es. Gives experience on steep grades, in lining as left by forms with boards laid 

 longitudinally. Canal carrying less than one-tenth rated capacity. Coefficient n= 

 0.0155. 



No. 33, VMC-f. Same canal and description as No. 32 above. Coefficient n= 

 0.0158. 



No. 34, VMC+. Same canal and description as No. 32 above. Coefficient n= 

 0.0171. 



No. 36, JBIv-8*, Santa Ana Canal, near Yorba, Cal. Concrete tamped behind 

 board forma. No plaster coat. Section wide and shallow. Several inches of sand in 

 bottom. Moss and grass in patches on sides. Coefficient n=0.0157. 



No. 39, JBIv-7*, Colton Canal, near Colton, Cal. Lining of unplastered concrete. 

 No sand or gravel. Sides and bottom covered with thin coat of moss. Coefficient n= 

 0.0167. 



No. 52, JBL-4*, Upper Canal, Riverside Water Co., California. Coat of 1 to 3 

 cement plaster roughly applied to concrete. Canal partially cleaned of a stringy 

 grass a few days before test. Isolated bunches of grass loft in bottom. Two curves 

 included in reach. Coefficient /i=0.02]8. 



No. 56, .JBIy-3*, Riverside Canal, California. From J. 5 to 2.5 feet of sand in bottom 

 of c-anal lined with 1 to 3 pla.ster coat on concrete. Top sand shifting downstream 

 (see No. 55;. Sides covered with feathery grass sometimes 1 foot long. Containing 

 boundary 75 per cent hhiffing sand and 25 per cent water grass. Two curvcH in 

 reatjh. Canal equivalent of earthen channel with loose sediment bottom. Coelli- 

 dent n=0.0284. 



• Details of above thrwj tests In Kngln. Ncw.s, (W (1«I3), No. )«, p. W)l. 



