18 



BULLETIN 114, U. S. DEPARTMENT OF AGRICULTURE. 



King Branch watershed consists of flat woods in the upper portion, 

 and rolling land in the lower portion, which has fair natural drainage 

 and is mostly under cultivation. The swamp along King Branch, 

 like others in this part of the district, is narrow at the upper end and 

 gradually widens toward the outlet. The fall is 40 feet in 5.6 miles, 

 being greater at the lower end than at the upper. A minimum dredge 

 ditch is recommended below the Orangeburg Road, and a handmade 

 ditch extending north for about 1 mile into the flat woods to give 

 those lands a drainage outlet. The ditch would have a total length 

 of 29,490 feet. Two 30-foot bridges will be required. 



Scott Swamp No. 1 drains rolling land principally, and most of the 

 lower end of the area is cultivated. At the upper end the swamp is 

 wide and flat, but it narrows rapidly toward the outlet. The fall is 

 39 feet in 2.4 miles. The proposed improvement is a handmade ditch 

 12,700 feet long. An existing small ditch about a mile long in the 

 upper part of the swamp will reduce the necessary excavation by 

 about 1,000 cubic yards. Two 15-foot bridges will be needed. 



LATERAL DITCHES. 



In addition to the ditches that have been described, practically all 

 of which lie in the larger watercourses, 66 laterals should be con- 

 structed as indicated and numbered on the map (fig. 2) . These will 

 extend out from the main channels at all the low places, to provide 

 drainage connection between the flat lands and the larger ditches. 

 Owing to the lack of machinery suitable for constructing small 

 ditches in wooded land, the laterals have been estimated as hand- 

 made ditches, 3 feet in bottom width, 5 feet deep, with \ to 1 side 

 slopes. The excavation has been computed as 1 cubic yard per linear 

 foot of ditch. Where these laterals are crossed by public roads 23 

 bridges will be required, each 15 feet long. The following table shows 

 the length and excavation for the lateral ditches: 



Table 3. — Length and excavation for lateral ditches. 

 [ExcavatiOn=l cubic yard per linear foot of ditch.] 



Lateral 

 No. 



Tributary to — 



Length and 

 excavation. 



Lateral 

 No. 



Tributary to — 



Length and 

 excavation. 



1 





Ft. and cu. yds. 

 3,600 

 5,900 



12, 200 

 3,100 

 4,800 



12,300 

 2,900 



6,900 

 6,875 

 4,100 

 5,300 

 8,400 

 4,500 

 5,300 



16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 





Ft.andcu.yd8. 

 4,100 

 2,800 



2 



...do 



do 



3 



Beaver Dam No. 1 



do 



.....do 



4,400 



4 



Beaver Dam No. 2 



Rum Branch 



9,600 



5 



do 



3,300 



6 



do 



do 



4,700 







...do 



5,100 



8 



(Eliminated. 1 



Beaver Dam N o. 1 



'Wolf Bay 



Lateral No. 22 



2,100 



9 



do 



2,200 



10 



Lateral No. 26 



3,600 



11 



Black Swamp 





11,650 



12 



do 



.do 



7,800 



13 







7,700 



14 



Beaver Dam No. 1 



Beaver Dam No. 2 





6,900 



15 



Mill Branch 



6,600 



