Frictional Resistance in Artificial Waterways 19 
HIGH MESA CHUTE, UNCOMPAHGRE PROJECT. 
This chute was built in the spring of 1913 and the experiment was 
made upon it in June. The waterway is composed of 2x12-inch 
boards on each side, joined by 2x12-inch boards at the floor, giv¬ 
ing ten inches by two feet as the dimensions of the cross-section. 
The lumber is mill-planed. It has a fall of about thirteen feet per 
100 feet. As will be noted the coefficient (n) is rather low for 
this type of lining. 
CHUTES 
Since from a construction standpoint practically all chutes may 
be classified as flumes or lined channels, the data has been placed 
under those headings. Experiments were made upon two timber 
and three concrete-lined chutes, included in Tables 6 and 7. 
CONCRETE=LINED CHANNELS 
LONG POND REINFORCED CONCRETE CHUTE, 
FORT COLLINS. Long Pond Reservoir is situated on a ridge 
to the north of the Cache la Poudre River, near Fort Collins, and 
is used for the storage of water to be supplied to the Larimer & 
Weld canal during the latter part of the irrigation season. The 
slope from the reservoir to the Larimer & Weld canal is such as to 
prohibit the use of an earth section to convey the water, hence a 
reinforced concrete chute, resting on piers from one foot to five 
feet high, was provided. (Plate VI.) This was constructed in 
the fall of 1910. The chute is rectangular in cross-section, being 
4.4 feet wide by 2.7 feet deep, and having a grade of three per¬ 
cent. The velocity of the water varies from 12 to 20 feet per sec¬ 
ond, depending upon the discharge. The -channel has a smooth 
cement lining and is in very good condition. The structure is over 
1,000 feet in length, but owing to curves and change of grade at 
inlet and outlet, only a 6oo-foot section was experimented upon. 
During a period when the channel was not in use, levels were run 
over this section and benches established upon the sides 100 feet 
apart, cross-sectional elevations of the bottom being taken opposite 
these points. 
During August and September, 1912, five experiments were 
made upon the flow of water in this flume, at different heads, for 
the purpose of determining any # variation of (n) with the change 
in hydraulic radius. The current meter measurements were made 
near the inlet in a section of light grade where the water had not 
yet attained a high velocity. Readings were taken to the water 
surface from all benches, the mean of the highest and lowest puL 
