FLOW OF WATER IN DREDGED DRAINAGE DITCHES.. - 23 
in the channel, but not nearly as many as in the channel of Hast 
Bogue Hasty (Plate VI, fig. 1; and fig. 3 @). The soil is a dark- 
colored clay, which cracks and crumbles when dry. The slope of the 
water surface was found to be exceedingly small, much less than the 
grades designated in the original design of the channel. This was 
due, no doubt, to the amount of sediment deposited in the channel 
below the course. . The values of n obtained are shown in Table 2. 
WEST BOGUE HASTY. 
For slope measurements on this channel a straight course 757 
feet long, of quite uniform cross section at banktul stage (fig. 4 D), 
was selected, located north of the highway bridge, about 1 mile east 
of Litton and about 6 miles from Shaw. At the lower end of the 
course, stakes for slope measurements were located about 50 feet above 
the entrance of alateral surface ditch. The gaugings for discharge 
were made from a suspension footbridge built about in the middle of 
the course. | 
The collection of drift by the bridge below the course and sedi- 
mentary deposits as a result of the drift and the entrance of a lateral 
ditch just above the bridge rendered this course rather unsuitable 
for accurate determinations of the value of n. During periods of 
no flow a pond of stagnant water extended nearly the whole length 
oi the course, this being due to the sediment deposited near the 
bridge. The side slopes and bed of the channel were quite regular. 
Some weeds were found on the side slopes (Plate VI, fig. 2). The 
soil is similar to that found in the channel of Bogue Hasty (see fig. 
3 D for average cross section). The results of the experiments on 
this ditch are shown m Table 2. 
EAST BOGUE HASTY. 
The course for slope measurements on East Bogue Hasty was 
established above the highway bridge, about 2 miles east of Litton 
and about 5 miles from Shaw. A stretch of 502 feet was selected, 
its upper end being just below a curve in the channel and the lower 
end just above the bridge and the entrance of a lateral ditch. The 
discharge measurements were made from a suspension footbridge 
about midway of the course. This course was rather short for accu- 
rate determinations of slope but was the straightest stretch of com- 
paratively uniform section (fig. 4 #) that could be found near the 
lower end of the channei. 
The side slopes, and in some places the bed of the channel, were 
covered with weeds and weed stubble, and the side slopes were 
slightly irregular (Plate VII, fig. 1). Practically no caving took 
place along the course, which fact was due, no doubt, to the vege- 
tation covering the banks. The soil is quite similar to that in the 
channel of Pecan Bayou. 
