66 BULLETIN 194_, U. S. DEPARTMENT OF AGEICULTTFEE. 



ter with some pebbles 2 inches. Slight growth of grass on one side. In opinion of 

 writer value of n is lower than might be expected. Coefficient n=0.0184. 



No. 143, SF-13**, small lateral from Corinne Branch Bear River Canal, Utah. In 

 good condition. Excavated in clayey loam. Now well lined with silt. Numerous 

 footprints of stock in bed. Coefficient n=0.0194. 



No. 144, SF-16**, Millville and Providence Canal. Constructecf 33 years before 

 test in compact clay dotted with small rock fragments one-half inch diameter. One 

 side perfectly smooth, other side has willow roots. Few small cobbles in bed. Other- 

 wise good condition. Coefficient n=0.0195. 



No. 146, SF-17**, Logan and Hyde Park Canal in Logan, Utah. Bed of clay cov- 

 ered with thin layer of fine sand. About one-sixth of perimeter covered ^\ith low 

 creeping water plant. (Value of n is lower than might be expected in opinion of 

 writer.) Coefficient n=0.0197. 



No. 147, VMC+, Mesa lateral a, Grand Valley Canal, Colorado. Carrying nearly 

 full capacity. Bed lined with fine sediment. Sides rather uneven surface of clay 

 loam. Short grass on bank was submerged one-half foot. Coefficient n=0.0200. 



No. 148, SF-20**, Solveson & Co. Canal, Utah. Channel of small pebbles embedded 

 insand. Coefficient tc=0. 0201. 



No. 150, SF--i8**, lateral of Logan City Canal, Utah. Channel of pebbles size of a 

 pea, embedded in finer material. No aquatic growth. Coefficient w=0.0204. 



No. 152, W-3+ + , Rist and Goss Ditch, Colorado. Built in hea\'j'- loam. Sides and 

 bottom well coated. No weeds or aquatic growth. Coefficient n=0.0204. 



No. 153, VlMC-f , Willcox Canal, Rifle, Colo. Bed of fine silt, sand, and pebbles, 

 with thin scattering of G-inch cobbles. Discharge tested less than one-twentieth of 

 rated capacity. Coefficient n==0.0205. 



No. 154, W-4+ + , Old Barnes Ditch, Colorado. In good condition. Constructed 

 in firm earth. Channel well coated with sediment. No stones or pebbles, but some 

 long grass overhangs banks. Coefficient n= 0.0206. 



No. 156, SF-6**, Logan and Richmond Canal, Utah. Bed smooth and free from 

 vegetation. Some indentations near top of channel. Coefficient ?i=0.0211. 



No. 159, SF-4**, Logan, Hyde Park and Smithfield Canal, Utah. Channel com- 

 posed of well-packed gravel, mostly of stones from 1 to 3 inches in diameter in equal 

 proportion. (This value appears low to the writer.) Coefficient n=0. 0213. 



No. 163, SF-11**, Point Lookout Canal, Utah. When tested carrying about one- 

 seventh of capacity. Channel smooth clayey loam lined with sediment. No vege- 

 tation in the reach, but some both above and below. Coefficient '/i=0.0218. 



No. 165, VMC+, Bessemer Canal, Pueblo, Colo. Bed of smooth waterworn: adobe. 

 Coefficient ?i=0.0219. 



No. 166, VMC+. Same canal as No. 165 above. Channel the same except for the 

 presence of cottonwood tree rootlets at the sides. Coefficient n=0.0281 . 



No. 168, W-2+-I-, Louden Ditch, Colorado. Bed has clean, sandy bottom without 

 growth of any kind. Would be considered in fair condition. Coefficient n=0.0220. 



No. 169, VMC-f, Mesa lateral. Grand Valley Canal, Colorado. Bed smoothly lined 

 with fine sediment. Sides of uneven loam. Short grass on bank submerged one-half 

 foot. Coefficient n=0.0220. 



No. 170, VMC+, Rio Grande, lateral 1-c, Del Norte, Colo. Description about the 

 same as for No. 171, except that the gravel is finer. Coefficient n=0.0221. 



No. 171, VMC+, Rio Grande, lateral 1, Del Norte, Colo. Bed varies from fine 

 gravel to smooth round rocks about 6 inches in diameter. Coefficient n=0.0390. 



No. 176, SF-19**, Lewiston Canal, Utah. At time of test carrying one-fourth rated 

 capacity. Bed of smooth clay. About one-fifth of perimeter covered with frog moss. 

 Coefficient n=0.0224. 



