THE FLOW OF WATER IN IRRIGATION CHANNELS. 63 
No. 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 
E=0.0124. 
No. 17, R. S. Same section as No. 16 above with different discharge. Coefficient 
n=0.0130. 
No. 18, VMC+, 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. 
No. 19, VMC4-. Same channel and reach as No. 18 above. Coefficient n=0.0125. 
No. 20, R. S., 5***, Umatilla project, United States Reclamation Service. Smooth, 
regular, section on a slight curve. Coefficient n=0.013. 
No. 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. 
No. 22, R. S., 4***. Same conduit but on curve of 100 feet radius. Coefficient 
n=0.0142. 
No. 23, R. S., 3***. Same conduit but on a curve of 50 feet radius. Coefficient 
n=0.0189. 1 
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 n=0.0139. 
No. 32, VMC+, South Canal, Uncompahgre project, United States Reclamation 
Service, Colorado. This and the following two tests made on short sections between 
curves. 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+. 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, JBL-8*, Santa Ana Canal, near Yorba, Cal. Concrete tamped behind 
board forms. 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, JBL-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 left in bottom. Two curves 
included in reach. Coefficient n=0.0218. 
No. 56, JBL-3*, Riverside Canal, California. From 1.5 to 2.5 feet of sand in bottom 
of canal lined with 1 to 3 plaster coat on concrete. Top sand shifting downstream 
(see No. 55). Sides covered with feathery grass sometimes 1 foot long. Containing 
boundary 75 per cent shifting sand and 25 per cent water grass. Two curves in 
reach. Canal equivalent of earthen channel with loose sediment bottom. Coeffi- 
cient n=0.0284. 
1 Details of above three tests in Engin. News, 69 (1913), No. 18, p. 904. 
