22 BULLETIN $32, U. S. DEPARTMENT OF AGRICULTURE. 
BOGUE HASTY. 
The course used for slope measurements on Bogue Hasty was 1,039 
feet long. It was straight and fairly uniform (fig. 4 B) and no water 
through drain tile or surface ditches entered the channel along the 
course. lt was located just above the highway bridge about 3 miles 
west of Shaw. The lower end of the course was above a slight bend in 
the channel and about 500 feet above the bridge. The gauging sia- 
tion, which consisted of a suspension footbridge (75-foot span), was 
placed near the lower end of the course. The conditions for both 
slope and discharge measurements were very good. 
This channel was found not to be in as good condition as that of 
Bogue Phalia. The right side slope was very irregular and was caving 
badly. The upper part was covered with weeds and small tree 
sprouts. The left side slope was very regular and practically free 
from vegetation. (Plate V, fig. 2.) The soil in the upper part of the 
channel is a dark silty loam and in the lower part a light-yellow clay. 
It is sticky when wet and cracks and crumbles when dry (see fig. 3 
B for average cross section of channel). 
Table No. 2 shows the hydraulic elements and the values of n 
obtained from these experiments. The value of n (0.0382) for 
extreme low stage is the highest obtained for this ditch, and is probably 
due to the irregularities*in the bed of the channel. The values of n 
obtained for measurements 11 to 14, inclusive, are applicable to the 
lower half of the channel, and they agree quite closely with those 
obtained for Bogue Phalia at bankful stage, the conditions of smooth- 
ness and regularity of this part of the channel being very similar 
to the conditions of the Bogue Phalia channel. The values of n 
obtained for the higher stages of the channel are considerably higher 
than for the lower stages. The very irregular and caving right 
bank would lead one to expect a larger roughness coefficient for 
bankful stage than for the lower hall. | 
PECAN BAYOU. 
A course 665 feet long was used for slope measurements on Pecan 
Bayou, located about 600 feet above the highway bridge, 5 miles 
directly south from Skene and about 3 miles from Shaw. The 
cross section of the channel at this piace was quite uniform (fig. 4 @), 
and no surface water entered along the course, which was situated 
between two bends in the channel. A suspension footbridge for 
gauging purposes was placed near the lower end of the course. 
Conditions on Pecan Bayou were similar to those described below 
for West Bogue Hasty. Much water was impounded along the course 
during periods of no flow. It appears that material was deposited in 
the channel below to impound water for the purpose of fishing. The 
side slopes of the channel were very regular. Some weeds were found 
