THE FLOW OF WATER IN IRRIGATION" CHANNELS. 67 
No. 177, W-5+ + , Geo. Rist 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 ?i=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=Q.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=0.0238. 
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-63**, 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, VMC4-, 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-74- + , 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+, Bessemer Ditch, Colorado. Bed of fine silt merging into clays 
with liberal sprinkling of loose stones up to 3 inches diameter. Coefficient n=0.0280. 
No. 214, VMC4-, Rio Grande lateral No. 1, Colorado. Bed composed of graded 
material from fine gravel to waterworn rocks 6 inches or more in diameter. Discharge 
was 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, 0.0386, 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 cross 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. 
Xo. 225, SF-64**, Hyrum Canal, Utah. Sides overgrown with alfalfa and weeds. 
Bed of coarse gravel up to walnut size. Coefficient n=0.0319. 
No. 226, W-12+ + , Beasley Ditch, Boulder, Colo. Excavated in gravel and fine 
sand with a good many small cobbles. Banks held in place by logs laid parallel 
to stream. Coefficient n=0.0320. 
Xo. 227, VMC4-, Bessemer Canal, Colorado. Bed of fine silt, merging into clays 
with liberal sprinkling of loose stones up to 3 inches diameter. Coefficient n=0.0321. 
No. 229, SF-55**, Smithfield Canal lateral, Utah. Cobbles partially covered with 
silt. Edges made irregular by cattle. Coefficient n=0.0329. 
