22 BULLETIN 832, U. S. DEPARTMENT OF AGRICULTURE. 



BOOUE 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. It 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 sta- 

 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 half. 



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 place was quite uniform (fig. 4 O), 

 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 coarse 

 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 



