THE FLOW OF WATER IN lEEIGATION CHANNELS. 67 



No. 177, W-5-j — |-, Geo. E,ist Ditch, Colorado. Originally excavated in material 

 ranging from earth to coarse gravel with occasional cobbles up to 6-inch size. Bed 

 lined with sediment. Banks uneven and overhung with sod. Coefficient n=0.0224. 



No. 181, SF-31**, Providence Upper Canal, Utah. Coefficient ?i=0.0229. 



No. 182, SF-14**, lateral of Bear River Canal, Utah. Originally excavated in clayey 

 loam. Now bed covered with sediment. Patches of horsetail moss. Edges uneven. 

 Coefficient n=0.0230. 



No. 183, SF-39**, lateral 2, Bear River Canal, Utah. Conditions similar to No. 182 

 above except there was no moss and some bunches of grass along the edges retarded 

 velocity. Coefficient n=0.0230. 



No. 185, SF-9^^, Walker Tract Canal, Utah. Channel in clayey loam free from vege- 

 tation. Low grade due to check dams in ditch, Coefficient n=0. 0232. 



No. 187, SF-1**, Providence Canal, Utah. In gravel size of peas with scattered 

 pieces size of walnuts. No vegetation. Coefficient n=0. 0238. 



No. 188, SF-5**, College and City Canal, Utah. Bed of gravel from ^ to 2 inch size 

 embedded in finer material. Edges somewhat irregular with willow roots, otherwise 

 no vegetation. Coefficient n=0.023S. 



No. 189, SF-27**, Logan, Hyde Park and Thatcher Canal, Utah. Sides smooth with 

 sediment. Bottom of earth, gravel, and pebbles up to 2^ inches diameter. Coarser 

 material covered one-fourth of perimeter. Coefficient n=0.0246. 



No. 191, SF-18**, College and City Canal, Utah. No vegetation, but sides uneven. 

 Bed covered with fragments of flat rock from | to 2 inches in greatest dimension. 

 Coefficient n=0.0247. 



No. 196, SF-C3**', Hyrum Canal, Utah. Sides of earth. One-half of perimeter 

 across bottom covered with rock fragments up to 1 inch across. Weeds and alfalfa 

 grew up to water's edge. Coefficient n=0.0260. 



No. 201, V:MC-}-, Rocky Ford Canal, Colorado. Bed of fine loose sand. Sides of 

 clay with fine grass roots projecting. Some grass overhangs into water. Canal some- 

 what crooked and banks irregular . Coefficient n=0 .0266 . 



No. 203, W-7-|--f , Loveland and Greeley Canal, Colorado. Overhanging sod banks 

 with grass in water. Earth channel with many cobbles up to 8 inches diameter. 

 Reach tested on a curve. Coefficient n=0.0267. 



No. 211, VMC-f, Bessemer Ditch, Colorado. Bed of fine silt merging into clays 

 with liberal sprinkling of loose stones up to 3 inches diameter. Coefficient w=0.0280. 



No. 214, VMC-f , Rio Grande lateral No. 1, Colorado. Bed composed of graded 

 material from fine gravel to waterworn rocks 6 inches or more in diameter. Discharge 

 waa measured 1 mile above reach tested, and 2 per cent arbitrarily deducted for 

 seepage loss. Three tests made on the same reach with discharge of 380 second- 

 feet, 33.34 second-feet, and 27.16 second-feet, gave values of n as 0.0284, 0.038G, and 

 0.0370, respectively. This gives a lower value of n for the greater discharge. 



No. 217, SF-42**, a central farm lateral of Bear River Canal, Utah. Bed of clay, 

 with uneven crr^ss section. Bunches of grass scattered along edges. Coefficient 

 n=0.0293. 



No. 218, SF-37**, a central farm lateral of Bear River Canal, Utah. A similar 

 canal and section as that in No. 217 above. Coefficient n=0.0295. 



No. 225, SF-^j4**, Ilyrum f'anal, Utah. Sides overgrown with alfalfa and weeds. 

 Bed of coarse gravel up Ui walnut size. Coefficient n=O.0'.iU). 



No, 226, W--i2-f -f, Beasloy Ditch, Boulder, Coif). Exravated in gravel and fine 

 Band with a gfK)d many small cobbles. Banks held iti place by logs laid parallel 

 to Btreara. Cfx^fficient n=0.0320. 



No. 227, \'M(!-\-, IJessemor Tanal, rolomdo. I'.fd nf line .sill, mcrj^'ing iiilo clays 

 with liberal spriiikling of Iooho sloiifH up to 3 inflict diiiiM(!((T. < '(K'nicicnt ?t=0.0321. 



No. 229, SI''-.'j5**, SniithfirHd ('anal lateral, I'tah. ("ohhlcs partially covered with 

 eilt. EdgcH made irrejfular by cattle, ('or-flicicnt 7J=0.0329. 



