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



JACOB SWAMP AT LOVETT ROAD- 



A slope course 300 feet in length, just west of the Lovett Road and 

 about 2 miles south of Lurnberton, was selected for slope measure- 

 ments on this channel. The cross section was fairly uniform for the 

 higher stages and the side slopes and bottom fairly regular. For 

 the lower stages there was considerable variation in cross section 

 (fig. 10 C). There was practically no vegetation hi the channel when 

 the measurements were made during January and February, but for 

 the single measurement made during May about two-thirds of the 

 bottom and side slopes were covered with water grass. (See Plate 

 XVII, fig. 1, for view and fig. 9 0, for average cross section of the 

 channel.) 



During low water the thread of the stream wanders from side to side, 

 which, with the large and abrupt variations in cross sections, is no 

 doubt responsible for the high value of n obtained for the lowest 

 stage (measurement 11, Table 5). The high value obtained for meas- 

 urement 15 is due, of course, to the growth of grass in the channel. 

 This value was obtained for about half-bankful stage. Values for 

 higher stages were not obtained, so that none of the values of n given 

 in Table 5 apply to the channel when flowing full. 



LITTLE JACOB SWAMP. 



A straight course 500 feet in length, just west of the Lovett Road 

 about 2 1 miles south of Lurnberton, was used for slope measurements. 

 This course was fairly uniform in cross section for a distance of about 

 450 feet from the upper end of the slope course, with quite regular 

 side slopes and bottom (fig. 10 B). There was very little growth in 

 the channel during the winter months. Plate XVII, figure 2, is a 

 view of the channel and figure 9 D, shows the average cross section. 

 During the summer months grass and weeds appear in the channel, 

 especially along the edge of the water, and there were several patches 

 of moss along the slope course. There was not sufficient growth in 

 the channel to produce a very marked effect upon the value of n, as 

 may be seen from the small difference in the results of the measure- 

 ments as given in Table 5 for the winter and summer months. The 

 values of n were obtained for only very low stages. 



JACOB SWAMP AT NASHVILLE & CHATTANOOGA RAILROAD. 



The slope course used on this channel was 300 feet in length and 

 was located just west of the Nashville & Chattanooga Railroad trestle, 

 about 2 miles south of Lurnberton. The cross section of this course of 

 channel was fairly uniform for a distance of about 275 feet from the 

 upper end of the course, but the side slopes were rather irregular (fig. 



